CN113727783A - Method for designing multistage electric field dust removal system of semiconductor manufacturing clean room system - Google Patents

Method for designing multistage electric field dust removal system of semiconductor manufacturing clean room system Download PDF

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Publication number
CN113727783A
CN113727783A CN202080030942.8A CN202080030942A CN113727783A CN 113727783 A CN113727783 A CN 113727783A CN 202080030942 A CN202080030942 A CN 202080030942A CN 113727783 A CN113727783 A CN 113727783A
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electric field
anode
cathode
dust removal
dust
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CN202080030942.8A
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唐万福
赵晓云
王大祥
段志军
邹永安
奚勇
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Shanghai Bixiufu Enterprise Management Co Ltd
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Shanghai Bixiufu Enterprise Management Co Ltd
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Priority claimed from CN202010322636.3A external-priority patent/CN113522525A/en
Priority claimed from CN202010323654.3A external-priority patent/CN113522526A/en
Application filed by Shanghai Bixiufu Enterprise Management Co Ltd filed Critical Shanghai Bixiufu Enterprise Management Co Ltd
Publication of CN113727783A publication Critical patent/CN113727783A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/011—Prefiltering; Flow controlling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/06—Plant or installations having external electricity supply dry type characterised by presence of stationary tube electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/49—Collecting-electrodes tubular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit

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Abstract

A method for designing a multi-stage electric field dust removal system for a semiconductor manufacturing clean room system, comprising the steps of: the total dust removal efficiency (100% - (100% -P) of the electric field dust removal system is realized by selecting the number n of the electric field devices in the multistage electric field dust removal system and the voltage of the power supply of each electric field device1％)*(100％‑P2％)*……*(100％‑Pn%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to a predetermined value, wherein P1％、P2％……Pn% is the dust removal efficiency of the 1 st, 2 nd and … … nth stage electric field devices respectively in sequence, and n is an integer larger than 1. The method can control the ozone generation amount below a preset value while ensuring the total dust removal efficiency.

Description

Method for designing multistage electric field dust removal system of semiconductor manufacturing clean room system Technical Field
The invention belongs to the field of air purification, and particularly relates to a method for designing a multistage electric field dust removal system of a semiconductor manufacturing clean room system.
Background
With the progress of technology, the size of semiconductor devices is smaller and smaller, and the requirements for the environment of semiconductor manufacturing plants are higher and higher. The clean room is a common manufacturing shop environment in the semiconductor manufacturing process, and is used to avoid the pollution of particles, humidity, temperature and the like to semiconductor materials, and further to influence the yield and reliability of semiconductors. Each clean room has different air cleanliness levels according to the cleanliness requirements of the production process for the production environment, and is generally classified by a maximum concentration limit of a certain particle size in the clean room. Accordingly, different air cleanliness levels impose different requirements on the cleanliness of the air stream entering the clean room.
Generally speaking, current semiconductor manufacturing factory building is the three-storey building, and the clean room is arranged in the intermediate level of factory building 2 nd floor, and clean system is installed on factory building 3 rd floor, including the filter pulp of installation between 3 rd floor and the 2 nd floor top, the air gets into from 3 rd floor, and the air that gets into 3 rd floor purifies through clean system, and the gas input after the purification is to the clean room on 2 nd floor, and the gas that the clean room produced is discharged into factory building 1 st floor, and 1 st floor keeps the negative pressure all the time, ensures that the clean room on 2 nd floor keeps the air-out all the time to 1 st floor, and the dust is inhaled not to advance.
Moreover, the existing semiconductor manufacturing plant occupies a large space and has high construction cost; the filter cotton which is about 1 meter behind is paved between the 2 nd floor and the 3 rd floor of the factory building and needs to be replaced regularly, which leads to the increase of the use cost.
At present, an electric field device is also used for dedusting and purifying particles contained in dust-containing gas, and the basic principle is that plasma is generated by high-voltage discharge to charge the particles, and then the charged particles are adsorbed on a dust collecting electrode to realize electric field dedusting. Although the existing electric field device can overcome the defects of large occupied space, high construction cost and large power consumption in the existing semiconductor manufacturing factory building, the dust removal requirement of the existing semiconductor manufacturing is higher and higher, and the corresponding requirement cannot be met by the existing electric field device. For example, the existing semiconductor manufacturing is generally under 100nm in size, and dust particles of 50nm are only allowed to be 2/m3Existing electric field devices have not been able to effectively remove particles of this grade.
Meanwhile, in the existing electric field dust removing device, ozone with a certain concentration is generated along with electric field discharge. Generally, in order to obtain high dust removal efficiency, a high electric field voltage is required. However, when the voltage of the electric field is increased to a certain value to satisfy the energy required for ozone formation, the ozone content is increased. The high-concentration ozone not only can affect the health of people, but also can accelerate the corrosion and oxidation of materials and equipment, accelerate the consumption of materials and shorten the service life of the equipment. If the ozone content in the clean room exceeds national or international standards, the working environment of the whole clean room is deteriorated.
In order to reduce the ozone content, the following four methods are generally adopted at present, namely, the ozone is automatically attenuated along with the flowing of the airflow; secondly, the temperature of the airflow flowing through the environment is raised, so that the ozone is quickly reduced into oxygen; thirdly, reacting ozone with reducing substances by using an oxidation-reduction reaction to realize the digestion of the ozone; fourthly, the ozone, such as activated carbon, is efficiently removed by utilizing an adsorbent or an adsorption device. The above mode needs to increase the length of the airflow channel or additionally increase the heating equipment and the ozone removing equipment, so that the ideal ozone removing effect can be achieved, and the defects of large volume, high cost, difficulty in control and the like exist.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a clean room system and a semiconductor manufacturing system for semiconductor manufacturing, and a multi-stage electric field dust removing method and a semiconductor manufacturing method for the clean room system for semiconductor manufacturing, and a method for designing the multi-stage electric field dust removing system for semiconductor manufacturing clean room system, which solves at least one of the problems of the excessive ozone concentration and the high electrostatic dust removing efficiency, and the problems of the prior art, such as high power consumption, large volume, high cost and incapability of removing nano-scale particles in air. Some embodiments of the invention can realize that the removal efficiency of the particles with the particle size of 23nm reaches more than 99.99 percent under the working condition that the gas flow velocity is 6m/s, and the removal efficiency is high, therefore, the invention realizes the effective removal of the particles under the high flow velocity, the required electric field device has small volume and low cost, and the operating electricity charge can be reduced; meanwhile, the removal efficiency of the particles with the particle size of 23nm in the gas can reach more than 99.99 percent in some embodiments of the invention, the output of ozone is controlled within a certain range, and the requirements of semiconductor manufacturing environment are met.
In order to achieve the above objects and other related objects, the present invention provides the following technical solutions:
1. example 1 provided by the present invention: a clean room system for semiconductor manufacture comprises a clean room, a multi-stage electric field dust removing system;
the clean room comprises a gas inlet; the multistage electric field dust removal system comprises a dust removal system inlet, a dust removal system outlet and at least two electric field devices connected in series; and the gas inlet of the clean room is communicated with the outlet of the dedusting system of the multistage electric field dedusting system.
2. Example 2 provided by the invention: including example 1 above, wherein each of the electric field devices includes an electric field cathode and an electric field anode for generating an ionizing electric field.
3. Example 3 provided by the present invention: the multistage electric field dust removal system comprises the above examples 1 or 2, wherein the multistage electric field dust removal system further comprises a power supply device, and an electric field anode and an electric field cathode of each electric field device are electrically connected with two electrodes of the power supply device respectively.
4. Example 4 provided by the present invention: including example 3 above, wherein the power supply device provides the same voltage to each of the electric field devices in the multi-stage electric field dedusting system.
5. Example 5 provided by the present invention: including example 3 above, wherein the power supply device provides a different voltage to each of the electric field devices in the multi-stage electric field dedusting system.
6. Example 6 provided by the present invention: including any one of the above examples 3 to 5, wherein the voltage value provided by the power supply device to each electric field device is sufficient to ensure the total dust removal efficiency (100% - (100% -P) of the multi-stage electric field dust removal system1％)* (100％-P 2％)*……*(100％-P n%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to a predetermined value, wherein P1％、P 2％……P n% is the dust removal efficiency of the 1 st, 2 nd and … … nth stage electric field devices respectively in sequence, and n is an integer larger than 1.
7. Example 7 provided by the present invention: including any of the above examples 1-6, wherein each of the electric field devices further comprises an electric field device inlet, an electric field device outlet; the electric field anode comprises a first anode part and a second anode part, the first anode part is close to the electric field device inlet, the second anode part is close to the electric field device outlet, and at least one cathode supporting plate is arranged between the first anode part and the second anode part.
8. Example 8 provided by the invention: including the above example 7, wherein the electric field device further includes an insulating mechanism for achieving insulation between the cathode support plate and the electric field anode.
9. Example 9 provided by the present invention: the method includes the above example 8, wherein an electric field flow channel is formed between the electric field anode and the electric field cathode, and the insulating mechanism is disposed outside the electric field flow channel.
10. Example 10 provided by the invention: including the above example 8 or 9, wherein the insulating mechanism includes an insulating portion and a heat insulating portion; the insulating part is made of ceramic materials or glass materials.
11. Example 11 provided by the present invention: the method includes the above example 10, wherein the insulating part is an umbrella-shaped string ceramic column, an umbrella-shaped string glass column, a column-shaped string ceramic column or a column-shaped glass column, and glaze is hung inside and outside the umbrella or inside and outside the column.
12. Example 12 provided by the present invention: including the above example 11, wherein the distance between the outer edge of the umbrella-shaped string ceramic pillar or the umbrella-shaped string glass pillar and the electric field anode is more than 1.4 times the electric field distance, the sum of the distances between the umbrella-shaped protruding edges of the umbrella-shaped string ceramic pillar or the umbrella-shaped string glass pillar is more than 1.4 times the insulation distance between the umbrella-shaped string ceramic pillar or the umbrella-shaped string glass pillar, and the total depth inside the umbrella edge of the umbrella-shaped string ceramic pillar or the umbrella-shaped string glass pillar is more than 1.4 times the insulation distance between the umbrella-shaped string ceramic pillar or the umbrella-shaped string glass pillar.
13. Example 13 provided by the present invention: including any of examples 7-12 above, wherein a length of the first anode portion is 1/10-1/4, 1/4-1/3, 1/3-1/2, 1/2-2/3, 2/3-3/4, or 3/4-9/10 of the electric field anode length.
14. Example 14 provided by the present invention: including any of examples 7 through 13 above, wherein the length of the first anode portion is sufficiently long to remove a portion of dust, reduce dust accumulation on the insulating mechanism and the cathode support plate, and reduce electrical breakdown due to dust.
15. Example 15 provided by the present invention: including any of examples 7-14 above, wherein the second anode portion includes a dust deposition section and a reserved dust deposition section.
16. Example 16 provided by the present invention: including any of the above examples 2-15, wherein the electric field cathode comprises at least one electrode rod.
17. Example 17 provided by the invention: including example 16 above, wherein the electrode rod has a diameter of no greater than 3 mm.
18. Example 18 provided by the present invention: including the above-mentioned example 16 or 17, wherein the electrode rod has a shape of a needle, a polygon, a burr, a screw rod, or a column.
19. Example 19 provided by the present invention: including any of examples 2-18 above, wherein the electric field anode is comprised of a hollow tube bundle.
20. Example 20 provided by the present invention: including example 19 above, wherein the hollow cross section of the electric field anode tube bundle takes a circular or polygonal shape.
21. Example 21 provided by the present invention: including example 20 above, wherein the polygon is a hexagon.
22. Example 22 provided by the present invention: including any of examples 18-21 above, wherein the tube bundle of field anodes is honeycomb shaped.
23. Example 23 provided by the present invention: including any of the above examples 2-22, wherein the electric field cathode is penetrated within the electric field anode.
24. Example 24 provided by the present invention: including any one of the above examples 2 to 23, wherein the electric field device further comprises an auxiliary electric field unit for generating an auxiliary electric field that is non-parallel to the ionizing electric field.
25. Example 25 provided by the present invention: including any one of the above examples 2 to 23, wherein the electric field device further comprises an auxiliary electric field unit, the ionization electric field comprises a flow channel, and the auxiliary electric field unit is used for generating an auxiliary electric field which is not perpendicular to the flow channel.
26. Example 26 provided by the invention: including the above-mentioned example 24 or 25, wherein the auxiliary electric field unit includes a first electrode, and the first electrode of the auxiliary electric field unit is disposed at or near an inlet of the ionization electric field.
27. Example 27 provided by the present invention: example 26 above is included, wherein the first electrode is a cathode.
28. Example 28 provided by the invention: including the above-mentioned examples 26 or 27, wherein the first electrode of the auxiliary electric field unit is an extension of the electric field cathode.
29. Example 29 provided by the present invention: examples 28 described above are included, in which the first electrode of the auxiliary electric field unit has an angle α with the electric field anode, and 0 ° < α ≦ 125 °, or 45 ° ≦ α ≦ 125 °, or 60 ° ≦ α ≦ 100 °, or α ≦ 90 °.
30. Example 30 provided by the present invention: including any of the above examples 24-29, wherein the auxiliary electric field unit comprises a second electrode, the second electrode of the auxiliary electric field unit being disposed at or near an outlet of the ionizing electric field.
31. Example 31 provided by the present invention: including example 30 above, wherein the second electrode is an anode.
32. Example 32 provided by the invention: including the above example 30 or 31, wherein the second electrode of the auxiliary electric field unit is an extension of the electric field anode.
33. Example 33 provided by the present invention: examples 32 described above are included, in which the second electrode of the auxiliary electric field unit has an angle α with the electric field cathode, and 0 ° < α ≦ 125 °, or 45 ° ≦ α ≦ 125 °, or 60 ° ≦ α ≦ 100 °, or α ≦ 90 °.
34. Example 34 provided by the invention: including any one of examples 24 to 27, 30, and 31 above, wherein the electrodes of the auxiliary electric field are provided independently of the electrodes of the ionizing electric field.
35. Example 35 provided by the invention: any one of the above examples 2 to 34 is included, wherein a ratio of a dust deposition area of the electric field anode to a discharge area of the electric field cathode is 1.667: 1-1680: 1.
36. example 36 provided by the invention: any one of the above examples 2 to 34 is included, wherein a ratio of a dust deposition area of the electric field anode to a discharge area of the electric field cathode is 6.67: 1-56.67: 1.
37. example 37 provided by the present invention: any one of the above examples 2 to 36, wherein the electric field cathode has a diameter of 1 to 3mm, and the electric field anode has a polar distance from the electric field cathode of 2.5 to 139.9 mm; the ratio of the dust deposition area of the electric field anode to the discharge area of the electric field cathode is 1.667: 1-1680: 1.
38. example 38 provided by the invention: including any of examples 2-36 above, wherein a polar separation of the electric field anode and the electric field cathode is less than 150 mm.
39. Example 39 provided by the invention: including any of examples 2-36 above, wherein the inter-polar distance between the electric field anode and the electric field cathode is 2.5-139.9 mm.
40. Example 40 provided by the present invention: including any of examples 2-36 above, wherein the inter-polar distance between the electric field anode and the electric field cathode is 5-100 mm.
41. Example 41 provided by the present invention: including any of examples 2-40 above, wherein the electric field anode is 10-180mm in length.
42. Example 42 provided by the present invention: including any of examples 2-40 above, wherein the electric field anode has a length of 60-180 mm.
43. Example 43 provided by the invention: including any of examples 2-42 above, wherein the electric field cathode has a length of 30-180 mm.
44. Example 44 provided by the invention: including any of examples 2-42 above, wherein the electric field cathode length is 54-176 mm.
45. Example 45 provided by the invention: including any of examples 24-44 above, wherein, when operating, the ionization field has a number of couplings ≦ 3.
46. Example 46 provided by the invention: any one of the above examples 2 to 44 is included, wherein a ratio of a dust deposition area of the electric field anode to a discharge area of the electric field cathode, a polar distance between the electric field anode and the electric field cathode, a length of the electric field anode, and a length of the electric field cathode are such that a number of coupling times of the ionization electric field is equal to or less than 3.
47. Example 47 provided by the invention: including any one of the above examples 2 to 46, wherein the ionizing electric field voltage has a value in a range of 1kv-50 kv.
48. Example 48 provided by the invention: including any of the above examples 2 to 47, wherein the electric field device further comprises a number of connection housings through which the series electric field stages are connected.
49. Example 49 provided by the invention: including example 48 above, wherein the distance of adjacent electric field levels is more than 1.4 times the pole pitch.
50. Example 50 provided by the invention: including any of the above examples 2-49, wherein the electric field device further comprises a pre-electrode between the electric field device inlet and the ionizing electric field formed by the electric field anode and the electric field cathode.
51. Example 51 provided by the present invention: the aforementioned example 50 is included, wherein the pre-electrode is in a shape of a plane, a net, a perforated plate, or a plate.
52. Example 52 provided by the invention: including the above example 50 or 51, wherein the front electrode is provided with at least one through hole.
53. Example 53 provided by the present invention: including example 52 above, wherein the through-holes are polygonal, circular, elliptical, square, rectangular, trapezoidal, or diamond shaped.
54. Example 54 provided by the invention: including the above-mentioned example 52 or 53, wherein the aperture of the through-hole is 0.1 to 3 mm. 55. Example 55 provided by the invention: including any of examples 50-54 above, wherein the pre-electrode is a combination of one or more of a solid, a liquid, a gas cluster, or a plasma.
56. Example 56 provided by the invention: including any of examples 50-55 above, wherein the pre-electrode is a conductive mixed-state substance, a biological natural mixed conductive substance, or an object artificially processed to form a conductive substance.
57. Example 57 provided by the invention: including any of examples 50-56 above, wherein the pre-electrode is 304 steel or graphite.
58. Example 58 provided by the invention: including any of examples 50-56 above, wherein the pre-electrode is an ionically conductive liquid.
59. Example 59 provided by the invention: including any of examples 50-58 above, wherein, in operation, the pre-electrode charges the particulate in the air as the particulate laden air passes through the pre-electrode before the particulate laden air enters the ionization electric field formed by the electric field cathode, the electric field anode.
60. Example 60 provided by the invention: including example 59 above, wherein the electric field anode applies an attractive force to the charged particles as the particulate laden air enters the ionizing electric field, causing the charged particles to move toward the electric field anode until the charged particles adhere to the electric field anode.
61. Example 61 provided by the invention: including examples 59 or 60 above, wherein the pre-electrode introduces electrons into the particles in the gas, the electrons being transferred between the pre-electrode and the electric field anode to charge more of the particles in the gas.
62. Example 62 provided by the invention: including any of examples 59 through 61 above, wherein electrons are conducted between the pre-electrode and the electric field anode through particulate matter in the gas and form an electric current.
63. Example 63 provided by the invention: including any of examples 59-62 above, wherein the pre-electrode charges the particulate matter in the gas by contacting the particulate matter in the gas.
64. Example 64 provided by the invention: including any one of examples 59 through 63 above, wherein the front electrode is provided with at least one through hole.
65. Example 65 provided by the invention: including example 64 above, where the air with the particulate matter passes through the through-holes in the pre-electrode, electrically charges the particulate matter in the air.
66. Example 66 provided by the invention: including any of examples 50-65 above, wherein the pre-electrode is perpendicular to the electric field anode.
67. Example 67 provided by the invention: including any of examples 50-66 above, wherein the pre-electrode is parallel to the electric field anode.
68. Example 68 provided by the invention: including any of examples 50-67 above, wherein the pre-electrode employs a wire mesh.
69. Example 69 provided by the present invention: including any of examples 50-68 above, wherein a voltage between the pre-electrode and the electric field anode is different from a voltage between the electric field cathode and the electric field anode.
70. Example 70 provided by the invention: including any of examples 50-69 above, wherein a voltage between the pre-electrode and the electric field anode is less than an initial corona onset voltage.
71. Example 71 provided by the invention: including any of examples 50-70 above, wherein the voltage between the pre-electrode and the electric field anode is 0.1-2 kv/mm.
72. Example 72 provided by the invention: including any of examples 50-71 above, wherein the electric field device comprises a flow channel in which the pre-electrode is located; the ratio of the cross-sectional area of the front electrode to the cross-sectional area of the flow channel is 99% -10%, or 90-10%, or 80-20%, or 70-30%, or 60-40%, or 50%.
73. Example 73 provided by the invention: a semiconductor manufacturing system comprising the clean room system for semiconductor manufacturing of any one of the above examples 1-72, further comprising:
and the film preparation device is arranged in the clean room.
And the film etching device is arranged in the clean room.
And the ion doping device is arranged in the clean room.
74. Example 74 provided by the invention: a multi-stage electric field dust removing method for a clean room system for semiconductor manufacturing, comprising the steps of:
each electric field device which enables air to pass through the multi-stage electric field dust removal system in series;
applying a voltage to each electric field device sufficient to ensure a total dust removal efficiency (100% - (100% -P) of the electric field dust removal system1％)*(100％-P 2％)*……*(100％-P n%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to a predetermined value, wherein P1％、P 2％……P n% of the dedusting efficiency of the 1 st-stage electric field device, the 2 nd-stage electric field device and the … … th-stage electric field device respectively in sequence, wherein n is an integer greater than 1;
and inputting the dedusted gas into the clean room.
75. Example 75 provided by the invention: including the above example 74 in which the voltage applied to each of the power supply devices is the same.
76. Example 76 provided by the invention: including the above example 74 in which the voltage applied to each of the power supply devices is not completely the same.
77. Example 77 provided by the invention: including the above-mentioned examples 74 or 76, the voltage applied to each of the power supply devices is completely different.
78. Example 78 provided by the invention: any of the above examples 74-77, wherein each electric field device that passes air through a series of multi-stage electric field dust removal systems comprises: air is subjected to electric field dust removal through each electric field device, and the electric field dust removal method comprises the following steps:
air is passed through an ionizing electric field created by an electric field anode and an electric field cathode.
79. Example 79 provided by the invention: example 78 is included, wherein the electric field dust removal method further comprises a method of providing an auxiliary electric field, comprising the steps of:
passing air through a flow passage;
an auxiliary electric field is generated in the flow channel, and the auxiliary electric field is not perpendicular to the flow channel.
80. Example 80 provided by the invention: example 79 is included, wherein the auxiliary electric field comprises a first electrode disposed at or near an entrance of the ionizing electric field.
81. Example 81 provided by the invention: example 80 is included, wherein the first electrode is a cathode.
82. Example 82 provided by the invention: including any one of examples 80 or 81, wherein the first electrode is an extension of the electric field cathode.
83. Example 83 provided by the invention: examples 82 are included wherein the first electrode has an angle α with the electric field anode of 0 ° < α ≦ 125 °, or 45 ° ≦ α ≦ 125 °, or 60 ° ≦ α ≦ 100 °, or α ≦ 90 °.
84. Example 84 provided by the invention: including any one of examples 79 to 83, wherein the auxiliary electric field comprises a second electrode disposed at or near an exit of the ionizing electric field.
85. Example 85 provided by the invention: example 84 is included, wherein the second electrode is an anode.
86. Example 86 provided by the invention: including examples 84 or 85, wherein the second electrode is an extension of the electric field anode.
87. Example 87 provided by the invention: examples 86 are included wherein the second electrode has an angle α with the electric field cathode and 0 ° < α ≦ 125 °, or 45 ° ≦ α ≦ 125 °, or 60 ° ≦ α ≦ 100 °, or α ≦ 90 °.
88. Example 88 provided by the invention: including any one of examples 79 to 81, wherein the first electrode is disposed independently of the electric field anode and the electric field cathode.
89. Example 89 provided by the invention: including examples 84 or 85, wherein the second electrode is disposed independently of the electric field anode and the electric field cathode.
90. Example 90 provided by the invention: including any one of examples 78 to 89, wherein the electric field dust removal method further comprises a method of reducing coupling of a dust removal electric field, comprising the steps of:
the electric field anode parameters or/and the electric field cathode parameters are selected to reduce the number of electric field couplings.
91. Example 91 provided by the invention: example 90 is included wherein a ratio of a dust collection area of the electric field anode to a discharge area of the electric field cathode is selected.
92. Example 92 provided by the invention: example 91 is included, wherein the ratio of the dust area of the electric field anode to the discharge area of the electric field cathode is selected to be 1.667: 1-1680: 1.
93. example 93 provided by the invention: example 91 is included, wherein selecting a ratio of a dust deposition area of the electric field anode to a discharge area of the electric field cathode to be 6.67: 1-56.67: 1.
94. example 94 provided by the invention: including any one of examples 90 to 93, wherein the method comprises selecting the electric field cathode to have a diameter of 1-3mm, and the electric field anode to the electric field cathode to have a polar separation of 2.5-139.9 mm; the ratio of the dust deposition area of the electric field anode to the discharge area of the electric field cathode is 1.667: 1-1680: 1.
95. example 95 provided by the invention: including any one of examples 90 to 94, comprising selecting a polar separation of the electric field anode and the electric field cathode to be less than 150 mm.
96. Example 96 provided by the invention: including any one of examples 90 through 94, comprising selecting a polar separation of the electric field anode and the electric field cathode of 2.5-139.9 mm.
97. Example 97 provided by the invention: including any one of examples 90 through 94, comprising selecting a polar separation of the electric field anode and the electric field cathode of 5-100 mm.
98. Example 98 provided by the invention: including any of examples 90 to 97, wherein comprising selecting the electric field anode to be 10-180mm in length.
99. Example 99 provided by the invention: including any of examples 90 to 97, wherein comprising selecting the electric field anode to have a length of 60-180 mm.
100. Example 100 provided by the invention: including any one of examples 90 to 99, wherein comprising selecting the electric field cathode length to be 30-180 mm.
101. Example 101 provided by the invention: including any one of examples 90 to 99, wherein the electric field cathode length is selected to be 54-176 mm.
102. Example 102 provided by the invention: including any one of examples 90 to 101, wherein the electric field cathode is selected to include at least one electrode rod.
103. Example 103 provided by the invention: example 102 is included wherein the diameter of the electrode rod is selected to be no greater than 3 mm.
104. Example 104 provided by the invention: including examples 102 or 103, including selecting the shape of the electrode rod to be needle-like, polygonal, burred, threaded rod-like, or cylindrical.
105. Example 105 provided by the invention: including any one of examples 90 to 104, wherein including selecting the electric field anode to be comprised of a hollow tube bundle.
106. Example 106 provided by the invention: example 105 is included, wherein the cross-section of the void comprising the anode tube bundle is selected to be circular or polygonal.
107. Example 107 provided by the invention: example 106 is included, wherein selecting the polygon to be a hexagon.
108. Example 108 provided by the invention: including any one of examples 105 to 107, wherein the tube bundle comprising the electric field anodes is selected to be honeycomb-shaped.
109. Example 109 provided by the invention: including any one of examples 90 to 108, comprising selecting the electric field cathode to be penetrated within the electric field anode.
110. Example 110 provided by the invention: including any of examples 90 through 109, wherein the electric field anode and/or the electric field cathode are selected to have an electric field coupling number of times ≦ 3.
111. Example 111 provided by the invention: a method for designing a multistage electric field dust removal system for a semiconductor manufacturing clean room comprises the following steps:
the total dust removal efficiency (100% - (100% -P) of the multistage electric field dust removal system is realized by selecting the number n of the electric field devices in the multistage electric field dust removal system and the voltage of the power supply of each electric field device1％)*(100％-P 2％)*……*(100％-P n%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to a predetermined value, wherein P1％、P 2％……P n% of each in turnThe dust removal efficiency of the 1 st, 2 nd and … … nth stage electric field devices is shown, wherein n is an integer greater than 1.
112. Example 112 provided by the invention: example 111 above, wherein selecting the voltage of each electric field device power supply in the multi-stage electric field dust removal system comprises: the voltage of the power supply of each electric field device in the multi-stage electric field dust removal system is selected to be the same.
113. Example 113 provided by the invention: example 111 above, wherein selecting the voltage of each electric field device power supply in the multi-stage electric field dust removal system comprises: the voltage of the power supply of each electric field device in the multi-stage electric field dust removal system is not completely the same.
114. Example 114 provided by the invention: including the above example 111 or 113, wherein the selecting the voltage of each electric field device power supply in the multi-stage electric field dust removing system includes: the voltage of each electric field device power supply in the multi-stage electric field dust removal system is selected to be completely different.
115. Example 115 provided by the invention: a semiconductor manufacturing method comprising the steps of:
removing particulates from a gas using the multi-stage electric field dust removal method of any of examples 74-110; inputting the dedusted gas into a clean room;
forming a thin film on a substrate in a clean room;
forming a channel on the film in a clean room, wherein the channel exposes the surface of the substrate;
and in a clean room, performing ion infiltration on the substrate exposed by the channel to form a specific structure with electronic characteristics.
In example 6, example 74, and example 111 provided by the present invention, the ozone output is less than or equal to a predetermined value, and the predetermined value is 30ppm (parts-per-million), or 10ppm, or 5ppm, or 3ppm, or 1ppm, or 0.1 ppm.
The invention has the following beneficial effects:
the existing semiconductor manufacturing plant is a three-storey building, a filter purification system of the clean room needs a single storey building, and the building cost is about $ 300/m2Thus, existing decontaminationThe system occupies large space and has high construction cost, and some embodiments of the invention can reduce volume and area by more than 10 times, save construction cost, and ensure that the invention has small volume and low construction cost.
Meanwhile, the resistance of the ultra-high efficiency filter in the prior art is often more than 1500 Pa, and the resistance of every 1000 kilowatts needs 1000 kilowatts of electricity consumed by the motor, so that the energy consumption of the fan is high, the resistance of some embodiments of the invention is only about 100 Pa, the electricity consumption can be saved by about 15 times, and the electricity consumption is low.
In addition, the existing electric field dust removal technology controls the ozone generation amount at the cost of reducing the dust removal efficiency, and ensures that the ozone does not exceed the standard. According to some embodiments of the invention, the removal efficiency of particulate matters with the particle size of 23nm can reach more than 99.99%, and the ozone output can be controlled below a preset value, so that the requirements of a semiconductor manufacturing factory on gas entering a clean room are met.
Drawings
Fig. 1 is a schematic structural diagram of an electric field device in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of an electric field generating unit in embodiments 2 to 11 of the present invention.
Fig. 3 is a view a-a of the electric field generating unit of fig. 2 in embodiments 2 and 5 of the present invention.
Fig. 4 is a view a-a of the electric field generating unit of fig. 2, marked with length and angle in examples 2 and 5 of the present invention.
Fig. 5 is a schematic view of the electric field device structure of two electric field stages in embodiment 2 and embodiment 5 of the present invention.
Fig. 6 is a schematic structural diagram of an electric field device in embodiment 12 of the present invention.
Fig. 7 is a schematic structural diagram of an electric field device in embodiment 14 of the present invention.
Fig. 8 is a schematic structural view of an electric field device in embodiment 15 of the present invention.
Fig. 9 is a schematic structural view of an electric field device in embodiment 16 of the present invention.
Fig. 10 is a schematic structural view of a clean room system according to embodiment 18 of the present invention.
Fig. 11 is a schematic structural view of a clean room system according to embodiment 19 of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention. The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As described above, some embodiments of the present invention can reduce the volume and area by more than 10 times compared with the prior art, and save the construction cost, so that the present invention has small volume and low cost. The resistance of the ultra-high efficiency filter in the prior art is often more than 1500 Pa, and the resistance of every 1000 kilowatts needs 1000 kilowatts of electricity consumed by the motor, so that the energy consumption of the fan is high, the resistance of some embodiments of the invention is only about 100 Pa, the electricity consumption can be saved by about 15 times, and the electricity consumption is low.
In addition, the existing electric field dust removal technology controls the ozone generation amount at the cost of reducing the dust removal efficiency to ensure that the ozone does not exceed the standard.
An embodiment of the invention provides a clean room system for semiconductor manufacturing, which comprises a clean room and a multi-stage electric field dust removal system; the clean room comprises a gas inlet; the multistage electric field dust removal system comprises a dust removal system inlet, a dust removal system outlet and at least two electric field devices connected in series; and the gas inlet of the clean room is communicated with the outlet of the dedusting system of the multistage electric field dedusting system.
In an embodiment of the present invention, each of the electric field devices includes an electric field cathode and an electric field anode, and the electric field cathode and the electric field anode are used for generating an ionization electric field. In an embodiment of the invention, the multistage electric field dust removal system includes a power supply device, and an electric field anode and an electric field cathode of each electric field device are electrically connected to two electrodes of the power supply device respectively.
In some embodiments of the present invention, the power devices may provide the same voltage for different electric field devices. For example, the multistage electric field dust removal system includes the 1 st level electric field device, the 2 nd level electric field device, the 3 rd level electric field device that establish ties in proper order, power supply unit includes first power, the electric field positive pole and the electric field negative pole of the 1 st level electric field device, the 2 nd level electric field device, the 3 rd level electric field device are respectively with two electrode electric connection of first power, first power provides the same voltage for the 1 st level electric field device, the 2 nd level electric field device, the 3 rd level electric field device simultaneously.
In some embodiments of the present invention, the power device can provide different voltages for different electric field devices. For example, the multistage electric field dust removal system comprises a 1 st-stage electric field device, a 2 nd-stage electric field device and a 3 rd-stage electric field device which are sequentially connected in series, and voltages required by the 1 st-stage electric field device, the 2 nd-stage electric field device and the 3 rd-stage electric field device are different. The power supply device can include a first power supply, a second power supply and a third power supply, wherein two electrodes of the first power supply are respectively and electrically connected with the electric field anode and the electric field cathode of the 1 st-level electric field device, two electrodes of the second power supply are respectively and electrically connected with the electric field anode and the electric field cathode of the 2 nd-level electric field device, two electrodes of the third power supply are respectively and electrically connected with the electric field anode and the electric field cathode of the 3 rd-level electric field device, and the first power supply, the second power supply and the third power supply provide different voltages.
In some embodiments of the present invention, the power device can provide partially the same voltage for each stage of the electric field device. For example, the multistage electric field dust removal system comprises a 1 st-stage electric field device, a 2 nd-stage electric field device and a 3 rd-stage electric field device which are sequentially connected in series, the voltages required by the 1 st-stage electric field device and the 2 nd-stage electric field device are the same, the voltage required by the 3 rd-stage electric field device is different from the voltages of the 1 st-stage electric field device and the 2 nd-stage electric field device, the power supply device can comprise a first power supply and a second power supply, an electric field anode and an electric field cathode of the 1 st-stage electric field device are electrically connected with two electrodes of the first power supply, an electric field anode and an electric field cathode of the 2 nd-stage electric field device are electrically connected with two electrodes of the first power supply, and the first power supply supplies power to the 1 st-stage electric field device and the 2 nd-stage electric field device simultaneously; and the electric field anode and the electric field cathode of the 3 rd-level electric field device are electrically connected with two electrodes of a second power supply, the second power supply supplies power to the 3 rd-level electric field device, and the first power supply and the second power supply provide different voltages.
In some embodiments of the present invention, the voltage value provided by the power supply device to each electric field device is sufficient to ensure the total dust removal efficiency (100% - (100% -P) of the multi-stage electric field dust removal system1％)*(100％-P 2％)*……*(100％-P n%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to a predetermined value, wherein P1％、P 2％……P n% is the dust removal efficiency of the 1 st level electric field device, the 2 nd level electric field device and the … … nth level electric field device in the multistage electric field dust removal system respectively in sequence, and n is an integer larger than 1.
In some embodiments of the present invention, the power supply device provides the same voltage to each electric field device in the multistage electric field dust removing system, and the voltage value is sufficient to ensure the total dust removing efficiency (100% - (100% -P) of the electric field dust removing system1％)*(100％-P 2％)*……*(100％-P n%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to oneA predetermined value, wherein P1％、P 2％……P n% is the dust removal efficiency of the 1 st, 2 nd and … … nth stage electric field devices respectively in sequence, and n is an integer larger than 1.
In an embodiment of the present invention, the power supply device provides different voltages to each of the electric field devices, the voltage of each of the electric field devices makes the ozone output of the ionization electric field smaller than a predetermined value, and the dust removal efficiency of each stage of the electric field devices is P1％、P 2％……P nPercent, n is an integer more than 1, and simultaneously ensures the total dust removal efficiency (100 percent-P) of the electric field dust removal system1％)*(100％-P 2％)*……*(100％-P n%)) is greater than a predetermined value. The power supply device provides different voltages for each electric field device, and the power supply device provides incompletely identical voltages and completely different voltages for each electric field device.
In an embodiment of the present invention, the multistage electric field dust removing system includes n stages of electric field devices, n is an integer greater than 1, and the dust removing efficiency in each stage of electric field device is P1％、P 2％、P 3％、……P nPercent, the total dust removal efficiency of the multistage electric field dust removal system is (100% - (100% -P)1％)*(100％-P 2％)*(100％-P 3％)*……*(100％-P n％))。
In some embodiments of the present invention, the structures of the electric field devices in the multi-stage electric field dust removing system may be completely the same, or may not be completely the same, or may be completely different.
In some embodiments of the present invention, a multi-stage electric field dust removing method for a clean room system for semiconductor manufacturing is provided, comprising the steps of:
each electric field device which enables the gas to pass through the multistage electric field dust removal system in series connection;
applying a voltage to each electric field device sufficient to ensure a total dust removal efficiency (100% - (100% -P) of the electric field dust removal system1％)*(100％-P 2％)*……*(100％-P n%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to a predetermined value, wherein P1％、P 2％……P n% of the dedusting efficiency of the 1 st-stage electric field device, the second-stage electric field device and the … … nth-stage electric field device respectively in sequence, wherein n is an integer greater than 1; and inputting the dedusted gas into the clean room.
In an embodiment of the present invention, each of the electric field devices, which are connected in series to allow air to pass through the multi-stage electric field dust removing system, includes: air is subjected to electric field dust removal through each electric field device, and the electric field dust removal method comprises the following steps:
air is passed through an ionizing electric field created by an electric field anode and an electric field cathode.
In an embodiment of the present invention, the present invention provides a multi-stage electric field dust removing method for a clean room system for semiconductor manufacturing, comprising the steps of: air is passed through at least two ionizing electric fields in series.
In some embodiments of the present invention, the voltage applied to each of the power devices may be the same. In some embodiments of the present invention, the voltage applied to each of the power devices is not identical. In some embodiments of the present invention, the voltage applied to each of the power devices may be different.
In some embodiments of the present invention, a method for designing a multi-stage electric field dust removal system for a semiconductor manufacturing clean room is provided, comprising the steps of:
the total dust removal efficiency (100% - (100% -P) of the electric field dust removal system is realized by selecting the number n of the electric field devices in the multistage electric field dust removal system and the voltage of the power supply of each electric field device1％)*(100％-P 2％)*……*(100％-P n%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to a predetermined value, wherein P1％、P 2％……P n% is the dust removal efficiency of the 1 st, 2 nd and … … nth stage electric field devices respectively in sequence, and n is an integer larger than 1.
In some embodiments of the present invention, the selecting the voltage of the power supply of each electric field device in the multi-stage electric field dust removing system includes: the voltage of the power supply of each electric field device in the multi-stage electric field dust removal system is selected to be the same.
In some embodiments of the present invention, the selecting the voltage of the power supply of each electric field device in the multi-stage electric field dust removing system includes: the voltage of the power supply of each electric field device in the multi-stage electric field dust removal system is not completely the same.
In some embodiments of the present invention, the selecting the voltage of the power supply of each electric field device in the multi-stage electric field dust removing system includes: the voltage of each electric field device power supply in the multi-stage electric field dust removal system is selected to be completely different.
The embodiment of the invention relates to a design method of a multistage electric field dust removal system. In the method, when the dust removal efficiency of the multi-stage electric field dust removal system is less than a preset value and/or the ozone output quantity is greater than the preset value, the voltage of at least one electric field device of the multi-stage electric field dust removal system is reduced to reduce the ozone output quantity, and/or the number of the electric field devices is increased to increase the dust removal efficiency of the multi-stage electric field dust removal system until the dust removal efficiency and the ozone output quantity reach the preset values. This is achieved because decreasing the voltage reduces the ozone output but also reduces the dust removal efficiency within a certain voltage range, but the ozone output is reduced to a greater extent than the dust removal efficiency.
In some embodiments of the present invention, a semiconductor manufacturing system is provided, comprising: the invention relates to a clean room system for semiconductor manufacturing, which comprises a clean room and a multi-stage electric field dust removal system; further comprising:
the thin film formation apparatus, which is provided in the clean room and is used to form a thin film on the substrate, may be any relevant apparatus applicable in the art.
The film etching device is arranged in the clean room and used for etching the film to form a channel, and any applicable relevant device in the prior art can be selected.
An ion doping apparatus, disposed in the clean room, is used to form a specific structure with electronic characteristics on the substrate exposed by the trench, and any relevant apparatus applicable in the prior art can be selected.
Some embodiments of the present invention also provide a semiconductor manufacturing method, including the steps of:
s1: air dust removal: removing particulate matters in the gas by using a multistage electric field dust removal method; the purified gas subjected to the dust removal by the multistage electric field enters a clean room;
s2, forming a thin film on the substrate;
s3, forming a channel on the film, wherein the channel exposes the surface of the substrate;
and S4, performing ion infiltration on the substrate exposed by the channel to form a specific structure with electronic characteristics.
In an embodiment of the present invention, in step S3, the trench formation includes the following steps:
coating photoresist on the surface of the film;
exposing the photoresist through a mask plate;
developing the photoresist, cleaning and removing part of the photoresist to expose part of the surface of the film;
and etching the exposed film to expose part of the surface of the substrate and form a channel.
In an embodiment of the invention, the photoresist is a positive photoresist or a negative photoresist.
In an embodiment of the invention, in step S2, the substrate is made of silicon, germanium, silicon carbide, gallium arsenide, indium arsenide, or indium phosphide, or any other suitable material.
In one embodiment of the present invention, in step S2, the thin film is formed by a CVD (Chemical Vapor Deposition) or PVD (Physical Vapor Deposition) process, or other conventionally applicable film forming methods.
In an embodiment of the present invention, in step S2, the main component of the film is silicon nitride, silicon oxide, silicon carbide, polysilicon, or any combination of two or more thereof, and may be any other suitable substance.
In some embodiments of the present invention, in step S3, the method for forming the trench may be any suitable method, for example, coating a photoresist on the surface of the thin film, placing a mask plate configured with a mask pattern over the photoresist, irradiating the mask plate with a light source, exposing the photoresist through the mask plate, and cleaning to remove a portion of the photoresist and expose a portion of the surface of the thin film. The light source may be any suitable light source, such as ultraviolet, deep ultraviolet, or extreme ultraviolet. The photoresist can be selected from positive or negative photoresist. When the positive photoresist is selected, the part of the photoresist irradiated by the light source is easily washed away by the developing solution, and the part not irradiated by the light source is not easily washed away by the developing solution and is left on the film. On the contrary, when a negative resist is selected, the portion of the resist irradiated by the light source is not easily washed off by the developing solution and remains on the film, and the portion not irradiated by the light source is easily washed off by the developing solution. No matter whether positive or negative photoresist is selected, one part of photoresist is washed away, and the other part of photoresist is remained on the film, so that the mask pattern on the mask plate is developed on the photoresist. And etching the exposed film part after the photoresist is washed away according to the mask pattern developed from the photoresist to form a channel and expose the substrate at the bottommost layer. The etching method may be any suitable method, for example, dry etching or wet etching. When dry etching is selected, the film etching can be carried out by methods such as sputtering etching and the like, and the film etching has better selectivity. When the wet etching is selected, chemical etching liquid such as hydrogen fluoride solution can be used for etching and dissolving the part of the film in contact with the chemical etching liquid, and the method has the characteristics of high etching rate, deep thickness and high sensitivity.
In an embodiment of the present invention, in step S4, the ion infiltration may be diffusion or ion implantation, or any other suitable method.
In an embodiment of the invention, in step S4, the electronic characteristic is a PN junction.
In an embodiment of the invention, in step S4, ions penetrate into the substrate exposed after etching to form a specific structure having electronic characteristics, such as a PN junction.
In an embodiment of the present invention, each electric field device of the multi-stage electric field dust removing system may include an electric field device inlet, an electric field device outlet, an electric field cathode, and an electric field anode, and the electric field cathode and the electric field anode are configured to generate an ionization electric field. Gas enters an ionization electric field, oxygen in the gas is ionized, a large number of oxygen ions with charges are formed, the oxygen ions are combined with particles such as dust in the gas, the particles are charged, the electric field anode exerts adsorption force on the particles with the negative charges, and the particles are adsorbed on the electric field anode to remove the particles in the gas.
In an embodiment of the invention, the electric field cathode includes a plurality of cathode filaments. The diameter of the cathode filament can be 0.1mm-20mm, and the size parameter is adjusted according to the application occasion and the dust accumulation requirement. In one embodiment of the present invention, the diameter of the cathode filament is not greater than 3 mm. In one embodiment of the invention, the cathode wire is made of metal wire or alloy wire which is easy to discharge, is temperature resistant, can support the self weight and is stable in electrochemistry. In an embodiment of the present invention, the cathode filament is made of titanium. The specific shape of the cathode filament is adjusted according to the shape of the electric field anode, for example, if the dust deposition surface of the electric field anode is a plane, the section of the cathode filament is circular; if the dust deposition surface of the electric field anode is a circular arc surface, the cathode filament needs to be designed into a polyhedral shape. The length of the cathode filament is adjusted according to the electric field anode.
In an embodiment of the present invention, the electric field cathode includes a plurality of cathode bars. In an embodiment of the present invention, the diameter of the cathode bar is not greater than 3 mm. In one embodiment of the present invention, the cathode rod is made of a metal rod or an alloy rod which is easily discharged. The shape of the cathode rod may be needle-like, polygonal, burr-like, threaded rod-like, columnar, or the like. The shape of the cathode bar can be adjusted according to the shape of the electric field anode, for example, if the dust deposition surface of the electric field anode is a plane, the section of the cathode bar needs to be designed to be circular; if the dust deposition surface of the electric field anode is a circular arc surface, the cathode bar needs to be designed into a polyhedral shape.
In an embodiment of the present invention, the electric field cathode is disposed through the electric field anode.
In one embodiment of the present invention, the electric field anode comprises one or more hollow anode tubes disposed in parallel. When there are a plurality of hollow anode tubes, all the hollow anode tubes constitute a honeycomb-shaped electric field anode. In an embodiment of the present invention, the cross-section of the hollow anode tube may be circular or polygonal. If the cross section of the hollow anode tube is circular, an even electric field can be formed between the electric field anode and the electric field cathode, and dust is not easy to accumulate on the inner wall of the hollow anode tube. If the cross section of the hollow anode tube is triangular, 3 dust accumulation surfaces can be formed on the inner wall of the hollow anode tube, 3 far-angle dust containing angles are formed, and the dust containing rate of the hollow anode tube with the structure is highest. If the cross section of the hollow anode tube is quadrilateral, 4 dust accumulation surfaces and 4 dust containing corners can be obtained, but the splicing structure is unstable. If the cross section of the hollow anode tube is hexagonal, 6 dust accumulation surfaces and 6 dust containing angles can be formed, and the dust accumulation surfaces and the dust containing rate are balanced. If the cross section of the hollow anode tube is polygonal, more dust-collecting edges can be obtained, but the dust holding rate is lost. In an embodiment of the present invention, the diameter of the inner circle of the hollow anode tube ranges from 5mm to 400 mm.
In an embodiment of the present invention, the electric field cathode is mounted on the cathode supporting plate, and the cathode supporting plate is connected to the electric field anode through the insulating mechanism. The insulating mechanism is used for realizing the insulation between the cathode supporting plate and the electric field anode. In an embodiment of the present invention, the electric field anode includes a first anode portion and a second anode portion, i.e. the first anode portion is close to the inlet of the electric field device, and the second anode portion is close to the outlet of the electric field device. The cathode supporting plate and the insulating mechanism are arranged between the first anode part and the second anode part, namely the insulating mechanism is arranged in the middle of an ionization electric field or in the middle of an electric field cathode, so that the cathode of the electric field can be well supported, the cathode of the electric field can be fixed relative to the anode of the electric field, and a set distance is kept between the cathode of the electric field and the anode of the electric field. In the prior art, the supporting point of the cathode is at the end point of the cathode, and the distance between the cathode and the anode is difficult to maintain. In an embodiment of the present invention, the insulating mechanism is disposed outside the electric field flow channel, that is, outside the electric field flow channel, so as to prevent or reduce dust and the like in the gas from collecting on the insulating mechanism, which may cause the insulating mechanism to break down or conduct electricity.
In an embodiment of the present invention, the insulating mechanism uses a high voltage resistant ceramic insulator to insulate the electric field cathode and the electric field anode. The electric field anode is also referred to as a housing.
In an embodiment of the invention, the first anode part is positioned in front of the cathode support plate and the insulating mechanism in the gas flowing direction, and the first anode part can remove water in the gas and prevent the water from entering the insulating mechanism to cause short circuit and ignition of the insulating mechanism. In addition, the first anode part can remove a considerable part of dust in the gas, and when the gas passes through the insulating mechanism, the considerable part of dust is eliminated, so that the possibility of short circuit of the insulating mechanism caused by the dust is reduced. In an embodiment of the present invention, the insulation mechanism includes an insulation porcelain rod. The design of first anode portion is mainly in order to protect insulating knob insulator not by pollution such as particulate matter in the gas, in case gas pollution insulating knob insulator will cause electric field positive pole and electric field negative pole to switch on to make the laying dust function of electric field positive pole invalid, so the design of first anode portion can effectively reduce insulating knob insulator and be polluted, improves the live time of product. In the process that gas flows through the electric field flow channel, the first anode part and the electric field cathode contact polluted gas firstly, and the insulating mechanism contacts the gas later, so that the purpose of removing dust firstly and then passing through the insulating mechanism is achieved, the pollution to the insulating mechanism is reduced, the cleaning and maintenance period is prolonged, and the corresponding electrode is supported in an insulating mode after being used. The length of the first anode portion is sufficiently long to remove a portion of dust, reduce dust accumulation on the insulating mechanism and the cathode support plate, and reduce electrical breakdown caused by dust. In an embodiment of the invention, the length of the first anode portion accounts for 1/10-1/4, 1/4-1/3, 1/3-1/2, 1/2-2/3, 2/3-3/4, or 3/4-9/10 of the total length of the electric field anode.
In an embodiment of the invention, the second anode portion is located behind the cathode support plate and the insulating mechanism in the gas flow direction. The second anode part comprises a dust deposition section and a reserved dust deposition section. The dust accumulation section adsorbs particles in the gas by utilizing static electricity, and the dust accumulation section is used for increasing the dust accumulation area and prolonging the service time of the electric field device. The reserved dust accumulation section can provide failure protection for the dust accumulation section. The reserved dust accumulation section is used for further improving the dust accumulation area and the dust removal effect on the premise of meeting the design dust removal requirement. And reserving a dust accumulation section for supplementing the dust accumulation of the front section. In an embodiment of the invention, the first anode portion and the second anode portion may use different power sources.
In an embodiment of the present invention, since there is a very high potential difference between the electric field cathode and the electric field anode, in order to prevent the electric field cathode and the electric field anode from being conducted, the insulating mechanism is disposed outside the electric field flow channel between the electric field cathode and the electric field anode. Therefore, the insulating mechanism is suspended outside the electric field anode. In one embodiment of the present invention, the insulating mechanism may be made of non-conductive temperature-resistant materials, such as ceramics, glass, etc. In one embodiment of the invention, the insulation of the completely closed air-free material requires that the insulation isolation thickness is more than 0.3 mm/kv; air insulation requirements >1.4 mm/kv. The insulation distance may be set according to 1.4 times the inter-polar distance between the electric field cathode and the electric field anode. In one embodiment of the invention, the insulating mechanism is made of ceramic, and the surface of the insulating mechanism is glazed; the connection can not be filled by using adhesive or organic materials, and the temperature resistance is higher than 350 ℃.
In an embodiment of the present invention, the insulating mechanism includes an insulating portion and a heat insulating portion. In order to make the insulating mechanism have the anti-pollution function, the insulating part is made of a ceramic material or a glass material. In an embodiment of the present invention, the insulating portion may be an umbrella-shaped string of ceramic posts or glass posts, and glaze is hung inside and outside the umbrella. The distance between the outer edge of the umbrella-shaped string ceramic column or the glass column and the anode of the electric field is more than or equal to 1.4 times of the distance of the electric field, namely more than or equal to 1.4 times of the pole pitch. The sum of the distances between the umbrella protruding edges of the umbrella-shaped string ceramic columns or the glass columns is more than or equal to 1.4 times of the insulation distance of the umbrella-shaped string ceramic columns. The total depth length in the umbrella edge of the umbrella-shaped string ceramic column or the glass column is more than or equal to 1.4 times of the insulation distance of the umbrella-shaped string ceramic column. The insulating part can also be a columnar ceramic column or a glass column, and glaze is hung inside and outside the column. In an embodiment of the invention, the insulating portion may also be in a tower shape.
In an embodiment of the present invention, a heating rod is disposed in the insulating portion, and when the ambient temperature of the insulating portion approaches the dew point, the heating rod is activated to perform heating. Because the inside and outside of the insulating part have temperature difference during use, condensation is easily generated inside and outside the insulating part. The outer surface of the insulation may be heated spontaneously or by gas to generate high temperature, which requires necessary insulation protection and scalding prevention. The heat insulation part comprises a protective enclosure baffle positioned outside the heat insulation part and a denitration purification reaction cavity. In an embodiment of the invention, the tail part of the insulating part needs to be insulated from the condensation position, so that the condensation component is prevented from being heated by the environment and the heat dissipation high temperature.
In one embodiment of the invention, the outgoing line of the power supply of the electric field device is connected in a wall-crossing manner by using the umbrella-shaped string ceramic column or the glass column, the elastic contact head is used for connecting the cathode supporting plate in the wall, the sealed insulation protection wiring cap is used for plugging and pulling out the wall, and the insulation distance between the outgoing line conductor and the wall is greater than that of the umbrella-shaped string ceramic column or the glass column. In one embodiment of the invention, the high-voltage part is provided with no lead and is directly arranged on the end head, so that the safety is ensured, the high-voltage module is wholly insulated and protected by ip68, and heat exchange and heat dissipation are realized by using a medium.
In an embodiment of the invention, the electric field anode and the electric field cathode are electrically connected to two electrodes of the power supply respectively. The voltage loaded on the electric field anode and the electric field cathode needs to be selected with proper voltage levels, and the specific selection of which voltage level depends on the volume, temperature resistance, dust holding rate and the like of the electric field device. For example, the voltage is from 1kv to 50 kv; the design firstly considers the temperature-resistant condition, the parameters of the inter-polar distance and the temperature: 1MM is less than 30 degrees, the dust accumulation area is more than 0.1 square/kilocubic meter/hour, the length of the electric field is more than 5 times of the inscribed circle of the single tube, and the air flow velocity of the electric field is controlled to be less than 9 meters/second. In an embodiment of the present invention, the electric field anode is formed of a first hollow anode tube and has a honeycomb shape. The first hollow anode tube port may be circular or polygonal in shape. In one embodiment of the invention, the value range of the internal tangent circle of the first hollow anode tube is 5-400mm, the corresponding voltage is 0.1-120kv, and the corresponding current of the first hollow anode tube is 0.1-30A; different inscribed circles correspond to different corona voltages, approximately 1KV/1 MM.
In an embodiment of the present invention, the electric field device includes an electric field stage, and the electric field stage includes a plurality of electric field generating units, and there may be one or more electric field generating units. The electric field generating unit is also called a dust collecting unit, and the dust collecting unit comprises the electric field anode and the electric field cathode, and one or more dust collecting units are arranged. When the electric field level is multiple, the dust collection efficiency of the electric field device can be effectively improved. In the same electric field level, the anodes of the electric fields have the same polarity, and the cathodes of the electric fields have the same polarity. And when there are a plurality of electric field stages, the electric field stages are connected in series. In an embodiment of the present invention, the electric field device further includes a plurality of connecting housings, and the series electric field stages are connected by the connecting housings; the distance between the electric field levels of two adjacent levels is more than 1.4 times of the pole pitch.
The inventor of the invention researches and discovers that the defects of poor removal efficiency and high energy consumption of the existing electric field device are caused by electric field coupling. The invention can obviously reduce the size (namely the volume) of the electric field dust removal device by reducing the coupling times of the electric field. For example, the size of the ionization dust removal device provided by the invention is about one fifth of the size of the existing ionization dust removal device. The reason is that the gas flow rate is set to be about 1m/s in the existing ionized dust removing device in order to obtain acceptable particle removal rate, but the invention can still obtain higher particle removal rate under the condition of increasing the gas flow rate to 6 m/s. When a given flow of gas is treated, the size of the electric field dust collector can be reduced as the gas velocity is increased.
In addition, the invention can obviously improve the particle removal efficiency. For example, the prior art electric field dust removing device can remove about 70% of the particulate matter in the engine exhaust gas at a gas flow rate of about 1m/s, but the present invention can remove about 99% of the particulate matter even at a gas flow rate of 6 m/s.
The present invention achieves the above-noted unexpected results as the inventors have discovered the effect of electric field coupling and have found a way to reduce the number of electric field couplings.
The scheme for reducing the coupling frequency of the electric field provided by the invention is as follows:
in one embodiment of the present invention, an asymmetric structure is adopted between the electric field cathode and the electric field anode. In the symmetrical electric field, the polar particles are subjected to an acting force with the same magnitude and opposite directions, and the polar particles reciprocate in the electric field; in an asymmetric electric field, the polar particles are subjected to two acting forces with different magnitudes, and the polar particles move towards the direction with the large acting force, so that the generation of coupling can be avoided.
An ionization electric field is formed between an electric field cathode and an electric field anode of the electric field device. In order to reduce the electric field coupling of the ionizing electric field, in an embodiment of the present invention, the method for reducing the electric field coupling includes the following steps: the ratio of the dust collecting area of the electric field anode to the discharging area of the electric field cathode is selected to make the electric field coupling frequency less than or equal to 3. In an embodiment of the present invention, a ratio of the dust collecting area of the electric field anode to the discharging area of the electric field cathode may be: 1.667: 1-1680: 1; 3.334: 1-113.34: 1; 6.67: 1-56.67: 1; 13.34: 1-28.33: 1. the embodiment selects the relatively large-area dust collecting area of the electric field anode and the relatively small-area discharge area of the electric field cathode, and specifically selects the area ratio, so that the discharge area of the electric field cathode can be reduced, the suction force is reduced, the dust collecting area of the electric field anode is enlarged, the suction force is enlarged, namely, asymmetric electrode suction force is generated between the electric field cathode and the electric field anode, dust after charging falls into the dust collecting surface of the electric field anode, the dust cannot be sucked away by the electric field cathode though the polarity is changed, the electric field coupling is reduced, and the electric field coupling frequency is less than or equal to 3. When the electric field interpolar distance is less than 150mm, the electric field coupling frequency is less than or equal to 3, the electric field energy consumption is low, the coupling consumption of the electric field to aerosol, water mist, oil mist and loose and smooth particles can be reduced, and the electric field electric energy is saved by 30-50%. The dust collection area refers to the area of the working surface of the electric field anode, for example, if the electric field anode is in a hollow regular hexagon tube shape, the dust collection area is the inner surface area of the hollow regular hexagon tube shape, and the dust collection area is also called as the dust deposition area. The discharge area refers to the area of the working surface of the cathode of the electric field, for example, if the cathode of the electric field is rod-shaped, the discharge area is the outer surface area of the rod.
In an embodiment of the invention, the length of the electric field anode can be 10-180mm, 10-20mm, 20-30mm, 60-180mm, 30-40mm, 40-50mm, 50-60mm, 60-70mm, 70-80mm, 80-90mm, 90-100mm, 100 + 110mm, 110 + 120mm, 120 + 130mm, 130 + 140mm, 140 + 150mm, 150 + 160mm, 160 + 170mm, 170 + 180mm, 60mm, 180mm, 10mm or 30 mm. The length of the electric field anode refers to the minimum length from one end of the working surface of the electric field anode to the other end. The length of the electric field anode is selected to effectively reduce electric field coupling.
In an embodiment of the invention, the length of the electric field cathode can be 30-180mm, 54-176mm, 30-40mm, 40-50mm, 50-54mm, 54-60mm, 60-70mm, 70-80mm, 80-90mm, 90-100mm, 100-110mm, 110-120mm, 120-130mm, 130-140mm, 140-150mm, 150-160mm, 160-170mm, 170-176mm, 170-180mm, 54mm, 180mm, or 30 mm. The length of the field cathode refers to the minimum length from one end of the working surface of the field cathode to the other. The length of the electric field cathode is selected to effectively reduce electric field coupling.
In one embodiment of the present invention, the distance between the electric field anode and the electric field cathode can be 5-30mm, 2.5-139.9mm, 9.9-139.9mm, 2.5-9.9mm, 9.9-20mm, 20-30mm, 30-40mm, 40-50mm, 50-60mm, 60-70mm, 70-80mm, 80-90mm, 90-100mm, 100-110mm, 110-120mm, 120-130mm, 130-139.9mm, 9.9mm, 139.9mm, or 2.5 mm. The distance between the electric field anode and the electric field cathode is also referred to as the pole pitch. The inter-polar distance specifically refers to the minimum vertical distance between the working surfaces of the electric field anode and the electric field cathode. The selection of the polar distance can effectively reduce the electric field coupling and enables the electric field device to have high temperature resistance.
In an embodiment of the present invention, the diameter of the electric field cathode is 1-3mm, and the inter-polar distance between the electric field anode and the electric field cathode is 2.5-139.9 mm; the ratio of the dust deposition area of the electric field anode to the discharge area of the electric field cathode is 1.667: 1-1680: 1.
in an embodiment, the multi-stage electric field dust removing method for a clean room system for semiconductor manufacturing provided by the present invention may further include a method for reducing coupling of an air dust removing electric field, comprising the steps of:
passing air through at least two ionizing electric fields in series; the ionization electric field is generated by an electric field anode and an electric field cathode;
the electric field anode or/and the electric field cathode are selected.
In an embodiment of the present invention, the size of the electric field anode and/or the electric field cathode is selected such that the number of electric field couplings is less than or equal to 3.
Specifically, the ratio of the dust collection area of the field anode to the discharge area of the field cathode is selected. Preferably, the ratio of the dust deposition area of the electric field anode to the discharge area of the electric field cathode is selected to be 1.667: 1-1680: 1.
more preferably, the ratio of the dust deposition area of the electric field anode to the discharge area of the electric field cathode is selected to be 6.67-56.67: 1.
in an embodiment of the present invention, the diameter of the electric field cathode is 1-3mm, and the inter-polar distance between the electric field anode and the electric field cathode is 2.5-139.9 mm; the ratio of the dust deposition area of the electric field anode to the discharge area of the electric field cathode is 1.667: 1-1680: 1.
preferably, the inter-polar distance between the electric field anode and the electric field cathode is selected to be less than 150 mm.
Preferably, the distance between the electric field anode and the electric field cathode is selected to be 2.5-139.9 mm. More preferably, the pole spacing between the electric field anode and the electric field cathode is selected to be 5.0-100 mm.
Preferably, the length of the electric field anode is selected to be 10-180 mm. More preferably, the length of the electric field anode is selected to be 60-180 mm.
Preferably, the length of the electric field cathode is selected to be 30-180 mm. More preferably, the length of the electric field cathode is selected to be 54-176 mm.
In an embodiment of the invention, the electric field device further includes an auxiliary electric field unit for generating an auxiliary electric field that is not parallel to the ionizing dust removal electric field.
In an embodiment of the present invention, the electric field device further includes an auxiliary electric field unit, the ionization dust removal electric field includes a flow channel, and the auxiliary electric field unit is configured to generate an auxiliary electric field that is not perpendicular to the flow channel.
In an embodiment of the present invention, the auxiliary electric field unit includes a first electrode, and the first electrode of the auxiliary electric field unit is disposed at or near an inlet of the ionization dust-removal electric field.
In an embodiment of the invention, the first electrode is a cathode.
In an embodiment of the invention, the first electrode of the auxiliary electric field unit is an extension of the electric field cathode.
In an embodiment of the present invention, the first electrode of the auxiliary electric field unit has an included angle α with the electric field anode, and 0 ° < α ≦ 125 °, or 45 ° ≦ α ≦ 125 °, or 60 ° ≦ α ≦ 100 °, or α ≦ 90 °.
In an embodiment of the invention, the auxiliary electric field unit includes a second electrode, and the second electrode of the auxiliary electric field unit is disposed at or near the outlet of the ionization dust-removal electric field.
In an embodiment of the invention, the second electrode is an anode.
In an embodiment of the invention, the second electrode of the auxiliary electric field unit is an extension of the electric field anode.
In one embodiment of the present invention, the second electrode of the auxiliary electric field unit has an angle α with the electric field cathode, and 0 ° < α ≦ 125 °, or 45 ° ≦ α ≦ 125 °, or 60 ° ≦ α ≦ 100 °, or α ≦ 90 °.
In an embodiment of the present invention, the electrodes of the auxiliary electric field and the electrodes of the ionization dust-removing electric field are independently disposed.
The ionizing electric field between the electric field anode and the electric field cathode is also referred to as the first electric field. In an embodiment of the invention, a second electric field not parallel to the first electric field is formed between the electric field anode and the electric field cathode. In another embodiment of the present invention, the flow channel of the second electric field and the ionization electric field is not perpendicular. The second electric field, also called auxiliary electric field, can be formed by one or two auxiliary electrodes, which can be placed at the entrance or exit of the ionizing electric field when the second electric field is formed by one auxiliary electrode, which can be charged to a negative potential, or to a positive potential. Wherein, when the auxiliary electrode is a cathode, it is arranged at or near the inlet of the ionization electric field; the auxiliary electrode and the electric field anode form an included angle alpha, and the alpha is more than 0 degrees and less than or equal to 125 degrees, or more than or equal to 45 degrees and less than or equal to 125 degrees, or more than or equal to 60 degrees and less than or equal to 100 degrees, or more than or equal to 90 degrees. When the auxiliary electrode is an anode, is arranged at or close to the outlet of the ionization field; the auxiliary electrode and the electric field cathode form an included angle alpha, and the alpha is more than 0 degrees and less than or equal to 125 degrees, or more than or equal to 45 degrees and less than or equal to 125 degrees, or more than or equal to 60 degrees and less than or equal to 100 degrees, or more than or equal to 90 degrees. When the second electric field is formed by two auxiliary electrodes, one of the auxiliary electrodes may be charged with a negative potential and the other auxiliary electrode may be charged with a positive potential; one auxiliary electrode may be placed at the entrance of the ionizing electric field and the other auxiliary electrode at the exit of the ionizing electric field. In addition, the auxiliary electrode may be a part of the electric field cathode or the electric field anode, that is, the auxiliary electrode may be formed by an extension of the electric field cathode or the electric field anode, in which case the lengths of the electric field cathode and the electric field anode are different. The auxiliary electrode may also be a single electrode, i.e. the auxiliary electrode may not be part of the electric field cathode or the electric field anode, in which case the voltage of the second electric field is different from the voltage of the first electric field and may be controlled individually according to the operating conditions. The auxiliary electrode comprises a first electrode and/or a second electrode in the auxiliary electric field unit.
In an embodiment of the present invention, the method for multi-stage electric field dust removal of a clean room system for semiconductor manufacturing further includes: a method of providing an auxiliary electric field, comprising the steps of:
passing air through a flow passage;
an auxiliary electric field is generated in the flow channel, and the auxiliary electric field is not perpendicular to the flow channel.
Wherein the auxiliary electric field ionizes the air.
In an embodiment of the invention, the auxiliary electric field is generated by the auxiliary electric field unit.
In one embodiment of the present invention, the electric field device includes a pre-electrode between the electric field device inlet and the ionizing electric field formed by the electric field anode and the electric field cathode. When gas flows through the pre-electrode from the inlet of the electric field device, particles and the like in the gas are charged.
In an embodiment of the present invention, the shape of the front electrode may be planar, mesh, perforated plate or plate. The mesh in the present invention is a shape including any porous structure. When the front electrode is in a plate shape, the front electrode may be a non-porous structure or a porous structure. When the front electrode is in a porous structure, one or more air inlet through holes are formed in the front electrode. In an embodiment of the present invention, the shape of the air inlet hole may be polygonal, circular, elliptical, square, rectangular, trapezoidal, or rhombic. In one embodiment of the present invention, the air inlet hole may have a contour size of 0.1-3mm, 0.1-0.2mm, 0.2-0.5mm, 0.5-1mm, 1-1.2mm, 1.2-1.5mm, 1.5-2mm, 2-2.5mm, 2.5-2.8mm, or 2.8-3 mm. When the gas with the particles passes through the through holes on the front electrode, the gas with the particles passes through the front electrode, so that the contact area between the gas with the particles and the front electrode is increased, and the charging efficiency is increased. The through hole in the pre-electrode of the present invention is any hole that allows a substance to flow through the pre-electrode.
In an embodiment of the present invention, the form of the front electrode may be one or a combination of solid, liquid, gas molecular group, plasma, conductive mixed-state substance, natural mixed conductive substance of organism, or artificial processing of object to form conductive substance. When the front electrode is solid, a solid metal, such as 304 steel, or other solid conductor, such as graphite, may be used. When the front electrode is a liquid, it can be an ion-containing conductive liquid.
When the gas with the particles passes through the preposed electrode, the preposed electrode charges the particles in the gas before the gas with the particles enters an ionization electric field formed by the electric field anode and the electric field cathode. When the gas enters the ionization electric field, the electric field anode exerts attraction on the charged particles, so that the charged particles move towards the electric field anode until the charged particles are attached to the electric field anode.
In one embodiment of the present invention, the pre-electrode introduces electrons into the particles in the gas, and the electrons are transferred between the pre-electrode and the electric field anode to charge more particles. Electrons are conducted between the pre-electrode and the electric field anode through particulate matter in the gas and form an electric current.
In one embodiment of the present invention, the pre-electrode charges the particles in the gas by contacting the particles in the gas. In one embodiment of the present invention, the pre-electrode transfers electrons to the particles in the gas by contacting the particles in the gas, and charges the particles in the gas.
In one embodiment of the present invention, the front electrode is perpendicular to the electric field anode. In one embodiment of the present invention, the pre-electrode is parallel to the electric field anode. In an embodiment of the present invention, the front electrode is a wire mesh. In one embodiment of the present invention, the voltage between the pre-electrode and the electric field anode is different from the voltage between the electric field cathode and the electric field anode. In an embodiment of the present invention, the voltage between the pre-electrode and the electric field anode is less than the initial corona onset voltage. The initial corona onset voltage is the minimum of the voltage between the electric field cathode and the electric field anode. In one embodiment of the present invention, the voltage between the pre-electrode and the electric field anode may be 0.1-2 kv/mm.
In an embodiment of the present invention, the electric field device includes a flow channel, and the pre-electrode is located in the flow channel. In an embodiment of the present invention, a ratio of a cross-sectional area of the front electrode to a cross-sectional area of the flow channel is 99% to 10%, or 90% to 10%, or 80% to 20%, or 70% to 30%, or 60% to 40%, or 50%. The cross-sectional area of the pre-electrode is the sum of the areas of the pre-electrode along the solid part of the cross-section. In one embodiment of the present invention, the pre-electrode is charged with a negative potential.
The following examples further illustrate the electric field dedusting system and method of the present invention.
Example 1
Fig. 1 is a schematic structural diagram of a primary electric field device in the multi-stage electric field dust removing system of the present embodiment. The electric field device comprises an electric field device inlet 1011, a front electrode 1013 and an insulating mechanism 1015.
The front electrode 1013 is arranged at the inlet 1011 of the electric field device, the front electrode 1013 is a conductive mesh plate, the conductive mesh plate is used for conducting electrons to pollutants such as metal dust, fog drops or aerosol with strong conductivity in the gas after being electrified, and the anode dust deposition part of the electric field device, namely the electric field anode 10141, attracts charged pollutants, so that the charged pollutants move to the electric field anode until the part of pollutants is attached to the electric field anode, and the part of pollutants is collected.
The electric field device comprises an electric field anode 10141 and an electric field cathode 10142 arranged in the electric field anode 10141, an asymmetric electrostatic field is formed between the electric field anode 10141 and the electric field cathode 10142, wherein after the gas containing the particulate matters enters the electric field device through the exhaust port, the gas is ionized due to discharge of the electric field cathode 10142, so that the particulate matters obtain negative charges, move towards the electric field anode 10141 and are deposited on the electric field anode 10141.
Specifically, the electric field anode 10141 is composed of a honeycomb-shaped and hollow anode tube bundle group, and the shape of the end opening of the anode tube bundle is hexagonal.
The electric field cathode 10142 includes a plurality of electrode rods, which penetrate through each anode tube bundle in the anode tube bundle group in a one-to-one correspondence manner, wherein the electrode rods are in a needle shape, a polygonal shape, a burr shape, a threaded rod shape or a columnar shape. The ratio of the dust collection area of the electric field anode 10141 to the discharge area of the electric field cathode 10142 is 1680: 1, the distance between the electric field anode 10141 and the electric field cathode 10142 is 9.9mm, the length of the electric field anode 10141 is 60mm, and the length of the electric field cathode 10142 is 54 mm.
In this embodiment, the gas outlet end of the electric field cathode 10142 is lower than the gas outlet end of the electric field anode 10141, the gas inlet end of the electric field cathode 10142 is flush with the gas inlet end of the electric field anode 10141, an included angle α is formed between the outlet end of the electric field anode 10141 and the near outlet end of the electric field cathode 10142, and α ═ 90 °, so that an accelerating electric field is formed inside the electric field device, and more substances to be processed can be collected.
The insulating mechanism 1015 includes an insulating portion and a heat insulating portion. The insulating part is made of ceramic materials or glass materials. The insulating part is an umbrella-shaped ceramic column or glass column string, or a columnar ceramic column or glass column string, and glaze is hung inside and outside the umbrella or inside and outside the column.
As shown in fig. 1, in an embodiment of the present invention, the electric field cathode 10142 is mounted on a cathode support plate 10143, and the cathode support plate 10143 and the electric field anode 10141 are connected through an insulating mechanism 1015. The insulating means 1015 is used for realizing the insulation between the cathode support plate 10143 and the electric field anode 10141. In one embodiment of the present invention, the field anode 10141 includes a first anode portion 101412 and a second anode portion 101411, i.e., the first anode portion 101412 is near the field device inlet and the second anode portion 101411 is near the field device outlet. The cathode support plate and the insulating mechanism are arranged between the first anode portion 101412 and the second anode portion 101411, that is, the insulating mechanism 1015 is arranged between the ionization electric field and the electric field cathode 10142, which can well support the electric field cathode 10142 and fix the electric field cathode 10142 relative to the electric field anode 10141, so that a set distance is maintained between the electric field cathode 10142 and the electric field anode 10141.
Example 2
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system, the structure schematic diagram of the electric field generating unit in this embodiment is shown in fig. 2, the a-a view of the electric field generating unit in this embodiment is shown in fig. 3, and the a-a view of the electric field generating unit with the length and angle marked in the electric field generating unit in this embodiment is shown in fig. 4.
As shown in fig. 2, the device comprises an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, wherein the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. Between the above-mentioned electric field anode 4051 and electric field cathode 4052, a discharge electric field is formed, which is an electrostatic field.
As shown in fig. 2, 3 and 4, in the present embodiment, the electric field anode 4051 has a hollow regular hexagonal tubular shape, the electric field cathode 4052 has a rod shape, and the electric field cathode 4052 is inserted into the electric field anode 4051.
A method of reducing electric field coupling comprising the steps of: the ratio of the dust collection area of the field anode 4051 to the discharge area of the field cathode 4052 was selected to be 6.67: 1, the inter-polar distance L3 between the electric field anode 4051 and the electric field cathode 4052 is 9.9mm, the length L1 of the electric field anode 4051 is 60mm, the length L2 of the electric field cathode 4052 is 54mm, the field anode 4051 comprises a fluid channel comprising an inlet end and an outlet end, the electric field cathode 4052 is disposed in the fluid channel, the electric field cathode 4052 extends in the direction of the collector fluid channel, the inlet end of the electric field anode 4051 is flush with the proximal inlet end of the electric field cathode 4052, the outlet end of the electric field anode 4051 and the proximal outlet end of the electric field cathode 4052 form an angle α of 118 degrees, and further, under the action of the electric field anode 4051 and the electric field cathode 4052, more substances to be processed can be collected, the electric field coupling frequency is less than or equal to 3, the coupling consumption of the electric field on aerosol, water mist, oil mist and loose and smooth particles in air can be reduced, and the electric energy of the electric field is saved by 30-50%.
The electric field device in the embodiment comprises a plurality of electric field stages formed by the electric field generating units, and the electric field stages are arranged in plurality, so that the dust collecting efficiency of the electric field device is effectively improved by utilizing a plurality of dust collecting units. In the same electric field level, the anodes of the electric fields have the same polarity, and the cathodes of the electric fields have the same polarity.
The electric field stages in the plurality of electric field stages are connected in series, the electric field stages in series are connected through the connecting shell, and the distance between the electric field stages of two adjacent stages is larger than 1.4 times of the inter-pole distance. Referring to fig. 5, the electric field device of the two electric field stages in this embodiment is schematically shown, and as shown in fig. 5, the electric field stages are two stages, i.e., a first electric field 4053 and a second electric field 4054, and the first electric field 4053 and the second electric field 4054 are connected in series by a connecting housing 4055.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 3
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
In this embodiment, the electric field anode 4051 has a hollow regular hexagonal tube shape, the electric field cathode 4052 has a rod shape, and the electric field cathode 4052 is inserted into the electric field anode 4051.
A method of reducing electric field coupling comprising the steps of: the ratio of the dust collection area of the electric field anode 4051 to the discharge area of the electric field cathode 4052 was selected to be 1680: 1, the inter-polar distance between the electric field anode 4051 and the electric field cathode 4052 is 139.9mm, the length of the electric field anode 4051 is 180mm, the length of the electric field cathode 4052 is 180mm, the electric field anode 4051 comprises a fluid channel, the fluid channel comprises an inlet end and an outlet end, the electric field cathode 4052 is disposed in the fluid channel, the electric field cathode 4052 extends along the direction of the dust collecting electrode fluid channel, the inlet end of the electric field anode 4051 is flush with the near inlet end of the electric field cathode 4052, the outlet end of the electric field anode 4051 is flush with the near outlet end of the electric field cathode 4052, and further under the action of the electric field anode 4051 and the electric field cathode 4052, more substances to be processed can be collected, the electric field coupling frequency is less than or equal to 3, the coupling consumption of the electric field to aerosol, water mist, oil mist and smooth and loose particles in the air can be reduced, and the electric field power can be saved by 20-40%.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 4
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
In this embodiment, the electric field anode 4051 has a hollow regular hexagonal tube shape, the electric field cathode 4052 has a rod shape, and the electric field cathode 4052 is inserted into the electric field anode 4051.
A method of reducing electric field coupling comprising the steps of: the ratio of the dust collection area of the field anode 4051 to the discharge area of the field cathode 4052 was selected to be 1.667: 1, the inter-polar distance between the electric field anode 4051 and the electric field cathode 4052 is 2.4mm, the length of the electric field anode 4051 is 30mm, the length of the electric field cathode 4052 is 30mm, the electric field anode 4051 comprises a fluid channel, the fluid channel comprises an inlet end and an outlet end, the electric field cathode 4052 is arranged in the fluid channel, the electric field cathode 4052 extends along the direction of the dust collecting electrode fluid channel, the inlet end of the electric field anode 4051 is flush with the near inlet end of the electric field cathode 4052, the outlet end of the electric field anode 4051 is flush with the near outlet end of the electric field cathode 4052, and further under the action of the electric field anode 4051 and the electric field cathode 4052, more substances to be processed can be collected, the electric field coupling frequency is less than or equal to 3, the coupling consumption of the electric field to aerosol, water mist, oil mist and loose smooth particles can be reduced, and the electric field power can be saved by 10-30%.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 5
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
As shown in fig. 2, 3 and 4, in the present embodiment, the electric field anode 4051 has a hollow regular hexagonal tube shape, the electric field cathode 4052 has a rod shape, the electric field cathode 4052 is inserted into the electric field anode 4051, and the ratio of the dust collection area of the electric field anode 4051 to the discharge area of the electric field cathode 4052 is 6.67: 1, the distance L3 between the electric field anode 4051 and the electric field cathode 4052 is 9.9mm, the length L1 of the electric field anode 4051 is 60mm, the length L2 of the electric field cathode 4052 is 54mm, the field anode 4051 comprises a fluid channel comprising an inlet end and an outlet end, the electric field cathode 4052 is disposed in the fluid channel, the electric field cathode 4052 extends in the direction of the collector fluid channel, the inlet end of the electric field anode 4051 is flush with the proximal inlet end of the electric field cathode 4052, the outlet end of the electric field anode 4051 and the proximal outlet end of the electric field cathode 4052 form an angle α of 118 degrees, and then under the effect of electric field positive pole 4051 and electric field negative pole 4052, can collect more pending material, guarantee that this electric field generating element's dust collection efficiency is higher, and typical tail gas granule pm0.23 dust collection efficiency is more than 99.99%, and typical 23nm granule gets rid of the efficiency and is more than 99.99%.
The electric field device in the embodiment comprises a plurality of electric field stages formed by the electric field generating units, and the electric field stages are arranged in plurality, so that the dust collecting efficiency of the electric field device is effectively improved by utilizing a plurality of dust collecting units. In the same electric field level, the anodes of the electric fields have the same polarity, and the cathodes of the electric fields have the same polarity.
The electric field stages in the plurality of electric field stages are connected in series, the electric field stages in series are connected through the connecting shell, and the distance between the electric field stages of two adjacent stages is larger than 1.4 times of the inter-pole distance. As shown in fig. 5, the electric field levels are two stages, a first stage electric field 4053 and a second stage electric field 4054, and the first stage electric field 4053 and the second stage electric field 4054 are connected in series by a connecting housing 4055.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 6
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
In this embodiment, the electric field anode 4051 has a hollow regular hexagonal tube shape, the electric field cathode 4052 has a rod shape, the electric field cathode 4052 is inserted into the electric field anode 4051, and the ratio of the dust collecting area of the electric field anode 4051 to the discharging area of the electric field cathode 4052 is 1680: 1, the interpole of electric field anode 4051 and electric field cathode 4052 is 139.9mm, and electric field anode 4051 is 180mm in length, and electric field cathode 4052 is 180mm in length, electric field anode 4051 includes the fluid passage, the fluid passage includes entrance end and exit end, electric field cathode 4052 arranges in the fluid passage, electric field cathode 4052 extends along the direction of collection dirt utmost point fluid passage, and the entrance end of electric field anode 4051 flushes with the nearly entrance end of electric field cathode 4052, and the exit end of electric field anode 4051 flushes with the nearly exit end of electric field cathode 4052, and then under the effect of electric field anode 4051 and electric field cathode 4052, can collect more the material that treats, guarantees that this electric field device's collection dust efficiency is higher, and typical exhaust particles pm0.23 collection efficiency is more than 99.99%, and typical 23nm particle removal efficiency is more than 99.99%.
The electric field device in the embodiment comprises a plurality of electric field stages formed by the electric field generating units, and the electric field stages are arranged in plurality, so that the dust collecting efficiency of the electric field device is effectively improved by utilizing a plurality of dust collecting units. In the same electric field level, the anodes of the electric fields have the same polarity, and the cathodes of the electric fields have the same polarity.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 7
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
In this embodiment, the field anode 4051 has a hollow regular hexagonal tube shape, the field cathode 4052 has a rod shape, the field cathode 4052 is inserted into the field anode 4051, and the ratio of the dust collection area of the field anode 4051 to the discharge area of the field cathode 4052 is 1.667: 1, the distance between the poles of the electric field anode 4051 and the electric field cathode 4052 is 2.4 mm. The length of the electric field anode 4051 is 30mm, the length of the electric field cathode 4052 is 30mm, the electric field anode 4051 comprises a fluid channel, the fluid channel comprises an inlet end and an outlet end, the electric field cathode 4052 is arranged in the fluid channel, the electric field cathode 4052 extends along the direction of the fluid channel of the dust collecting pole, the inlet end of the electric field anode 4051 is flush with the near inlet end of the electric field cathode 4052, the outlet end of the electric field anode 4051 is flush with the near outlet end of the electric field cathode 4052, and further under the action of the electric field anode 4051 and the electric field cathode 4052, more substances to be treated can be collected, the electric field device is guaranteed to have higher dust collecting efficiency, the dust collecting efficiency of typical exhaust particles pm0.23 is more than 99.99%, and the removal efficiency of typical 23nm particles is more than 99.99%.
In this embodiment, the electric field anode 4051 and the electric field cathode 4052 constitute a plurality of dust collecting units, so that the dust collecting efficiency of the electric field apparatus can be effectively improved by using a plurality of dust collecting units.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 8
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
In this embodiment, the electric field anode 4051 has a hollow regular hexagonal tube shape, the electric field cathode 4052 has a rod shape, and the electric field cathode 4052 is inserted into the electric field anode 4051.
A method of reducing electric field coupling comprising the steps of: the ratio of the dust collecting area of the electric field anode 4051 to the discharging area of the electric field cathode 4052 is selected to be 27.566:1, the pole pitch between the electric field anode 4051 and the electric field cathode 4052 is 2.3mm, the length of the electric field anode 4051 is 5mm, the length of the electric field cathode 4052 is 4mm, the electric field anode 4051 comprises a fluid channel, the fluid channel comprises an inlet end and an outlet end, the electric field cathode 4052 is arranged in the fluid channel, the electric field cathode 4052 extends along the direction of the dust collecting pole fluid channel, the inlet end of the electric field anode 4051 is flush with the near inlet end of the electric field cathode 4052, the outlet end of the electric field anode 4051 is flush with the near outlet end of the electric field cathode 4052, and further under the action of the electric field anode 4051 and the electric field cathode 4052, more substances to be processed can be collected, the number of electric field coupling times is less than or equal to 3, and the dust collecting efficiency of the electric field generating unit is ensured to be higher.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 9
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
In this embodiment, the electric field anode 4051 has a hollow regular hexagonal tube shape, the electric field cathode 4052 has a rod shape, and the electric field cathode 4052 is inserted into the electric field anode 4051.
A method of reducing electric field coupling comprising the steps of: the ratio of the dust collecting area of the electric field anode 4051 to the discharge area of the electric field cathode 4052 was selected to be 1.108:1, the inter-pole distance between the electric field anode 4051 and the electric field cathode 4052 was 2.3mm, the electric field anode: the length of utmost point 051 is 60mm, and electric field cathode 4052 length is 200mm, electric field anode 4051 includes fluid passage, fluid passage includes entrance end and exit end, electric field cathode 4052 arranges in the fluid passage, electric field cathode 4052 extends along the direction of collection utmost point fluid passage, and electric field anode 4051's entrance point flushes with electric field cathode 4052's nearly entrance end, and electric field anode 4051's exit end flushes with electric field cathode 4052's nearly exit end, and then under electric field anode 4051 and electric field cathode 4052's effect, can collect more pending material, realizes that electric field coupling number of times is less than or equal to 3, guarantees that this electric field generating unit's dust collection efficiency is higher.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 10
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
In this embodiment, the electric field anode 4051 has a hollow regular hexagonal tube shape, the electric field cathode 4052 has a rod shape, and the electric field cathode 4052 is inserted into the electric field anode 4051.
A method of reducing electric field coupling comprising the steps of: the ratio of the dust collection area of the electric field anode 4051 to the discharge area of the electric field cathode 4052 was selected as 3065: 1, the interpolar distance of electric field anode 4051 and electric field cathode 4052 is 249mm, and electric field anode 4051 length is 2000mm, and electric field cathode 4052 length is 180mm, electric field anode 4051 includes fluid passage, fluid passage includes entrance end and exit end, electric field cathode 4052 arranges in fluid passage, electric field cathode 4052 extends along the direction of collection dirt utmost point fluid passage, and electric field anode 4051's entrance end flushes with electric field cathode 4052's nearly entrance end, and electric field anode 4051's exit end flushes with electric field cathode 4052's nearly exit end, and then under electric field anode 4051 and electric field cathode 4052's effect, can collect more pending material, realizes that the electric field coupling number of times is less than or equal to 3, guarantees that this electric field generating unit's dust collection efficiency is higher.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 11
The electric field generating unit in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, as shown in fig. 2, includes an electric field anode 4051 and an electric field cathode 4052 for generating an electric field, the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to two electrodes of a power supply, the power supply is a dc power supply, and the electric field anode 4051 and the electric field cathode 4052 are respectively electrically connected to an anode and a cathode of the dc power supply. In this embodiment the electric field anode 4051 has a positive potential and the electric field cathode 4052 has a negative potential.
The dc power supply in this embodiment may be a dc high voltage power supply. The above-mentioned electric field anode 4051 and electric field cathode 4052 form a discharge electric field therebetween, which is an electrostatic field.
In this embodiment, the electric field anode 4051 has a hollow regular hexagonal tube shape, the electric field cathode 4052 has a rod shape, and the electric field cathode 4052 is inserted into the electric field anode 4051.
A method of reducing electric field coupling comprising the steps of: the ratio of the dust collecting area of the electric field anode 4051 to the discharging area of the electric field cathode 4052 is 1.338:1, the pole pitch between the electric field anode 4051 and the electric field cathode 4052 is 5mm, the length of the electric field anode 4051 is 2mm, the length of the electric field cathode 4052 is 10mm, the electric field anode 4051 comprises a fluid channel, the fluid channel comprises an inlet end and an outlet end, the electric field cathode 4052 is arranged in the fluid channel, the electric field cathode 4052 extends along the direction of the dust collecting pole fluid channel, the inlet end of the electric field anode 4051 is flush with the near inlet end of the electric field cathode 4052, the outlet end of the electric field anode 4051 is flush with the near outlet end of the electric field cathode 4052, and further under the action of the electric field anode 4051 and the electric field cathode 4052, more substances to be processed can be collected, the number of electric field coupling times is less than or equal to 3, and the dust collecting efficiency of the electric field generating unit is higher.
In this embodiment, the material to be treated may be dust in the form of particles in the air.
Example 12
The electric field device in this embodiment can be applied to the one-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, and the structural schematic diagram of the electric field device in this embodiment is shown in fig. 6. As shown in fig. 6, the electric field device includes an electric field cathode 5081 and an electric field anode 5082 electrically connected to a cathode and an anode of a dc power source, respectively, and an auxiliary electrode 5083 electrically connected to an anode of the dc power source. In this embodiment the electric field cathode 5081 has a negative potential and the electric field anode 5082 and the auxiliary electrode 5083 each have a positive potential.
Meanwhile, as shown in fig. 6, the auxiliary electrode 5083 is fixed to the field anode 5082 in this embodiment. After the electric field anode 5082 is electrically connected to the anode of the dc power source, the auxiliary electrode 5083 is also electrically connected to the anode of the dc power source, and the auxiliary electrode 5083 and the electric field anode 5082 have the same positive potential.
As shown in fig. 6, the auxiliary electrode 5083 may extend in the front-rear direction in the present embodiment, i.e., the length direction of the auxiliary electrode 5083 may be the same as the length direction of the electric field anode 5082.
As shown in fig. 6, in this embodiment, the electric field anode 5082 has a tubular shape, the electric field cathode 5081 has a rod shape, and the electric field cathode 5081 is inserted into the electric field anode 5082. In this embodiment, the auxiliary electrode 5083 is also tubular, and the auxiliary electrode 5083 and the field anode 5082 form an anode tube 5084. The front end of the anode tube 5084 is flush with the field cathode 5081, and the rear end of the anode tube 5084 is rearward beyond the rear end of the field cathode 5081, and the portion of the anode tube 5084 rearward beyond the field cathode 5081 is the auxiliary electrode 5083. That is, in the present embodiment, the electric field anode 5082 and the electric field cathode 5081 have the same length, and the electric field anode 5082 and the electric field cathode 5081 are opposite to each other in position in the front-rear direction; the auxiliary electrode 5083 is located behind the electric field anode 5082 and the electric field cathode 5081. Thus, an auxiliary electric field is formed between the auxiliary electrode 5083 and the field cathode 5081, and the auxiliary electric field applies a backward force to the negatively charged oxygen ion stream between the field anode 5082 and the field cathode 5081. When the gas containing the substances to be treated flows into the anode tube 5084 from front to back, the oxygen ions with negative charges are combined with the substances to be treated in the process of moving towards the electric field anode 5082 and backwards, and because the oxygen ions have backward moving speed, the oxygen ions are combined with the substances to be treated, and strong collision cannot be generated between the oxygen ions and the substances to be treated, so that the larger energy consumption caused by the strong collision is avoided, the oxygen ions are easily combined with the substances to be treated, the charging efficiency of the substances to be treated in the gas is higher, further, under the action of the electric field anode 5082 and the anode tube 5084, more substances to be treated can be collected, and the higher dust removal efficiency of the electric field device is ensured.
In addition, as shown in fig. 6, in the present embodiment, an angle α is formed between the rear end of the anode 5084 and the rear end of the electric field cathode 5081, and 0 ° < α ≦ 125 °, or 45 ° ≦ α ≦ 125 °, or 60 ° ≦ α ≦ 100 °, or α ≦ 90 °.
In this embodiment, the electric field anode 5082, the auxiliary electrode 5083, and the electric field cathode 5081 form a plurality of dust removing units, so as to effectively improve the dust removing efficiency of the electric field apparatus.
In this embodiment, the material to be treated may be dust in the form of particles.
The dc power supply in this embodiment may be a dc high voltage power supply. A discharge electric field, which is an electrostatic field, is formed between the electric field cathode 5081 and the electric field anode 5082. In the absence of the auxiliary electrode 5083, the ion flow in the electric field between the electric field cathode 5081 and the electric field anode 5082 is perpendicular to the electrode direction, and turns back and forth between the electrodes to flow, and causes the ions to turn back and forth between the electrodes to be consumed. Therefore, in this embodiment, the auxiliary electrode 5083 is used to shift the relative positions of the electrodes, so that the relative imbalance between the electric field anode 5082 and the electric field cathode 5081 is formed, which deflects the ion current in the electric field. In the electric field device, an auxiliary electrode 5083 forms an electric field that can provide an ion flow with directionality. The collecting rate of the particles entering the electric field along the ion flow direction is improved by nearly one time compared with the collecting rate of the particles entering the electric field along the reverse ion flow direction, so that the dust accumulation efficiency of the electric field is improved, and the power consumption of the electric field is reduced. In addition, the main reason that the dust collection efficiency of the dust collection electric field in the prior art is low is that the direction of dust entering the electric field is opposite to or perpendicular to the direction of ion flow in the electric field, so that the dust and the ion flow collide violently with each other and generate large energy consumption, and the charge efficiency is also influenced, so that the dust collection efficiency of the electric field in the prior art is reduced, and the energy consumption is increased.
Example 13
The electric field device in this embodiment can be applied to the first-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the invention, and includes an electric field cathode and an electric field anode electrically connected to the cathode and the anode of the dc power supply, respectively, and an auxiliary electrode electrically connected to the cathode of the dc power supply. In this embodiment, the auxiliary electrode and the electric field cathode have negative potentials, and the electric field anode has a positive potential.
In this embodiment, the auxiliary electrode can be fixed to the cathode of the electric field. Thus, after the electric field cathode is electrically connected with the cathode of the direct current power supply, the auxiliary electrode is also electrically connected with the cathode of the direct current power supply. Meanwhile, the auxiliary electrode extends in the front-rear direction in the present embodiment.
In this embodiment, the electric field anode is tubular, the electric field cathode is rod-shaped, and the electric field cathode is arranged in the electric field anode in a penetrating manner. In the present embodiment, the auxiliary electrode is also in the form of a rod, and the auxiliary electrode and the electric field cathode form a cathode rod. The front end of the cathode bar is extended forward beyond the front end of the electric field anode, and the part of the cathode bar extended forward beyond the electric field anode is the auxiliary electrode. That is, the length of the electric field anode is the same as that of the electric field cathode in the present embodiment, and the electric field anode and the electric field cathode are opposite in position in the front-back direction; the auxiliary electrode is positioned in front of the electric field anode and the electric field cathode. Thus, an auxiliary electric field is formed between the auxiliary electrode and the electric field anode, and the auxiliary electric field applies backward force to the negatively charged oxygen ion flow between the electric field anode and the electric field cathode, so that the negatively charged oxygen ion flow between the electric field anode and the electric field cathode has backward moving speed. When the gas containing the substances to be treated flows into the tubular electric field anode from front to back, the negatively charged oxygen ions are combined with the substances to be treated in the process of moving towards the electric field anode and backwards, and because the oxygen ions have backward moving speed, the oxygen ions are combined with the substances to be treated, and strong collision cannot be generated between the oxygen ions and the substances to be treated, so that the larger energy consumption caused by strong collision is avoided, the oxygen ions are easily combined with the substances to be treated, the charging efficiency of the substances to be treated in the gas is higher, and further, under the action of the electric field anode, more substances to be treated can be collected, and the higher dust removal efficiency of the electric field device is ensured.
In this embodiment, the electric field anode, the auxiliary electrode, and the electric field cathode form a plurality of dust removing units, so as to effectively improve the dust removing efficiency of the electric field apparatus by using the plurality of dust removing units.
In this embodiment, the material to be treated may be dust in the form of particles.
Example 14
The electric field device in this embodiment can be applied to the one-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, and the structural schematic diagram of the electric field device in this embodiment is shown in fig. 7. As shown in fig. 7, the electric field device includes an auxiliary electrode 5083, and the auxiliary electrode 5083 extends in the left-right direction. In this embodiment, the length direction of the auxiliary electrode 5083 is different from the length direction of the electric field anode 5082 and the electric field cathode 5081. And the auxiliary electrode 5083 may be specifically perpendicular to the field anode 5082.
In this embodiment, the electric field cathode 5081 and the electric field anode 5082 are electrically connected to the cathode and the anode of the dc power supply, respectively, and the auxiliary electrode 5083 is electrically connected to the anode of the dc power supply. In this embodiment the electric field cathode 5081 has a negative potential and the electric field anode 5082 and the auxiliary electrode 5083 each have a positive potential.
As shown in fig. 7, in the present embodiment, the electric field cathode 5081 and the electric field anode 5082 are opposed to each other in the front-rear direction, and the auxiliary electrode 5083 is located behind the electric field anode 5082 and the electric field cathode 5081. Thus, an auxiliary electric field is formed between the auxiliary electrode 5083 and the field cathode 5081, and the auxiliary electric field applies a backward force to the negatively charged oxygen ion stream between the field anode 5082 and the field cathode 5081, so that the negatively charged oxygen ion stream between the field anode 5082 and the field cathode 5081 has a backward moving velocity. When gas containing substances to be treated flows into an electric field between the electric field anode 5082 and the electric field cathode 5081 from front to back, oxygen ions with negative charges are combined with the substances to be treated in the process of moving towards the electric field anode 5082 and backwards, and the oxygen ions have backward moving speed, so that the oxygen ions are combined with the substances to be treated, and strong collision cannot be generated between the oxygen ions and the substances to be treated, thereby avoiding larger energy consumption caused by strong collision, enabling the oxygen ions to be easily combined with the substances to be treated, enabling the charging efficiency of the substances to be treated in the gas to be higher, further being capable of collecting more substances to be treated under the action of the electric field anode 5082, and ensuring that the dust removal efficiency of the electric field device is higher.
Example 15
The electric field device in this embodiment can be applied to the one-stage electric field device in the multi-stage electric field dust removing system of the semiconductor manufacturing clean room system of the present invention, and the structural schematic diagram of the electric field device in this embodiment is shown in fig. 8. As shown in fig. 8, the electric field device includes an auxiliary electrode 5083, and the auxiliary electrode 5083 extends in the left-right direction. In this embodiment, the length direction of the auxiliary electrode 5083 is different from the length direction of the electric field anode 5082 and the electric field cathode 5081. And the auxiliary electrode 5083 may be specifically perpendicular to the field cathode 5081.
In this embodiment, the electric field cathode 5081 and the electric field anode 5082 are electrically connected to the cathode and the anode of the dc power supply, respectively, and the auxiliary electrode 5083 is electrically connected to the cathode of the dc power supply. In this embodiment, the electric field cathode 5081 and the auxiliary electrode 5083 each have a negative potential, and the electric field anode 5082 has a positive potential.
As shown in fig. 8, in the present embodiment, the electric field cathode 5081 and the electric field anode 5082 are opposed to each other in the front-rear direction, and the auxiliary electrode 5083 is positioned in front of the electric field anode 5082 and the electric field cathode 5081. Thus, an auxiliary electric field is formed between the auxiliary electrode 5083 and the field anode 5082, and the auxiliary electric field applies a backward force to the negatively charged oxygen ion stream between the field anode 5082 and the field cathode 5081, so that the negatively charged oxygen ion stream between the field anode 5082 and the field cathode 5081 has a backward moving velocity. When gas containing substances to be treated flows into an electric field between the electric field anode 5082 and the electric field cathode 5081 from front to back, oxygen ions with negative charges are combined with the substances to be treated in the process of moving towards the electric field anode 5082 and backwards, and the oxygen ions have backward moving speed, so that the oxygen ions are combined with the substances to be treated, and strong collision cannot be generated between the oxygen ions and the substances to be treated, thereby avoiding larger energy consumption caused by strong collision, enabling the oxygen ions to be easily combined with the substances to be treated, enabling the charging efficiency of the substances to be treated in the gas to be higher, further being capable of collecting more substances to be treated under the action of the electric field anode 5082, and ensuring that the dust removal efficiency of the electric field device is higher.
Example 16
Referring to fig. 9, a schematic diagram of an electric field device in this embodiment is shown, which can be applied to a first-stage electric field device in a multi-stage electric field dust removing system of a semiconductor manufacturing clean room system according to the present invention. As shown in fig. 9, the electric field device includes an electric field device inlet 3085, a flow channel 3086, an electric field flow channel 3087, and an electric field device outlet 3088, which are sequentially communicated, a pre-electrode 3083 is installed in the flow channel 3086, a ratio of a cross-sectional area of the pre-electrode 3083 to a cross-sectional area of the flow channel 3086 is 99% -10%, the electric field device further includes an electric field cathode 3081 and an electric field anode 3082, and the electric field flow channel 3087 is located between the electric field cathode 3081 and the electric field anode 3082. The working principle of the electric field device of the invention is as follows: the gas containing pollutants enters the flow channel 3086 through the electric field device inlet 3085, the prepositive electrode 3083 arranged in the flow channel 3086 conducts electrons to partial pollutants, partial pollutants are charged, after the pollutants enter the electric field flow channel 3087 from the flow channel 3086, the electric field anode 3082 applies attraction to the charged pollutants, the charged pollutants move towards the electric field anode 3082 until the partial pollutants are attached to the electric field anode 3082, meanwhile, an ionization electric field is formed between the electric field cathode 3081 and the electric field anode 3082 in the electric field flow channel 3087, the ionization electric field can enable the other part of uncharged pollutants to be charged, and the other part of pollutants are also subjected to the attraction applied by the electric field anode 3082 after being charged and are finally attached to the electric field anode 3082, so that the electric field device is utilized to enable the pollutants to be charged more efficiently and fully, thereby ensuring that the electric field anode 3082 can collect more pollutants, and ensures that the electric field device of the invention has higher collection efficiency of pollutants.
The cross-sectional area of the pre-electrode 3083 refers to the sum of the areas of the pre-electrode 3083 along the solid portion of the cross-section. In addition, the ratio of the cross-sectional area of the pre-electrode 3083 to the cross-sectional area of the flow channel 3086 may be 99-10%, or 90-10%, or 80-20%, or 70-30%, or 60-40%, or 50%.
As shown in fig. 9, in the present embodiment, the front electrode 3083 and the electric field cathode 3081 are both electrically connected to the cathode of the dc power supply, and the electric field anode 3082 is electrically connected to the anode of the dc power supply. In this embodiment, the pre-electrode 3083 and the electric field cathode 3081 both have a negative potential and the electric field anode 3082 has a positive potential.
As shown in fig. 9, the front electrode 3083 in this embodiment may be a mesh, i.e. has a plurality of through holes. Thus, when the gas flows through the flow channel 3086, the gas and the pollutants can flow through the front electrode 3083 conveniently by using the structural characteristics that the front electrode 3083 is provided with the through holes, and the pollutants in the gas can be more fully contacted with the front electrode 3083, so that the front electrode 3083 can conduct electrons to more pollutants, and the electrification efficiency of the pollutants is higher.
As shown in fig. 9, in the present embodiment, the electric field anode 3082 has a tubular shape, the electric field cathode 3081 has a rod shape, and the electric field cathode 3081 is inserted into the electric field anode 3082. In this embodiment, the electric field anode 3082 and the electric field cathode 3081 are asymmetric. The ionized electric field formed when the gas flows between the electric field cathode 3081 and the electric field anode 3082 charges the contaminants and the charged contaminants are collected on the inner wall of the electric field anode 3082 by the attraction force applied by the electric field anode 3082.
As shown in fig. 9, in the present embodiment, the field anode 3082 and the field cathode 3081 both extend in the front-rear direction, and the front end of the field anode 3082 is located forward of the front end of the field cathode 3081 in the front-rear direction. As shown in fig. 9, the rear end of the field anode 3082 is located behind the rear end of the field cathode 3081 in the front-rear direction. In this embodiment, the electric field anode 3082 is longer in the front-rear direction, so that the adsorption surface area on the inner wall of the electric field anode 3082 is larger, and thus the attraction force to the contaminants having a negative potential is larger, and more contaminants can be collected.
As shown in fig. 9, the electric field cathode 3081 and the electric field anode 3082 form a plurality of ionization units in this embodiment, so that more pollutants can be collected by the plurality of ionization units, and the electric field apparatus has a stronger pollutant collecting capability and a higher collecting efficiency.
The above-described electric field cathode 3081 is also referred to as a corona charging electrode in the present embodiment. The direct current power supply is specifically a direct current high voltage power supply. A direct current high voltage is introduced between the front electrode 3083 and the electric field anode 3082 to form a conductive loop; a DC high voltage is applied between the electric field cathode 3081 and the electric field anode 3082 to form an ionization discharge corona electric field. The pre-electrode 3083 is a densely distributed conductor in this embodiment. When dust which is easily charged passes through the front electrode 3083, electrons are directly given to the dust by the front electrode 3083, and the dust is charged and then adsorbed by the heteropolar electric field anode 3082; meanwhile, the uncharged dust passes through an ionization region formed by the electric field cathode 3081 and the electric field anode 3082, ionized oxygen formed in the ionization region charges electrons to the dust, and thus the dust is charged continuously and adsorbed by the electric field anode 3082 with different polarity.
The electric field device in this embodiment can form two or more electrifying modes. For example, when the oxygen in the gas is sufficient, the ionization discharge corona electric field formed between the electric field cathode 3081 and the electric field anode 3082 can be used to ionize the oxygen to charge the pollutants, and then the electric field anode 3082 is used to collect the pollutants; when the oxygen content in the gas is too low or in an oxygen-free state or the pollutants are conductive dust fog and the like, the pollutants are directly electrified by the front electrode 3083, and are adsorbed by the electric field anode 3082 after being fully electrified.
Example 17
The present embodiment provides a clean room system for semiconductor manufacturing, comprising a clean room and a multi-stage electric field dust removal system, wherein a gas inlet of the clean room is communicated with an outlet of the multi-stage electric field dust removal system, and the multi-stage electric field dust removal system 102 comprises at least two electric field devices of the above embodiments 1 to 16, and all the electric field devices are connected in series. The air needs to flow through all the electric field devices connected in series in the multistage electric field dust removal system firstly, so that the multistage electric field dust removal system is utilized to effectively remove substances waiting for treatment of dust in the air, wherein the removal efficiency of typical 23nm particles is more than 99.99%, the air is ensured to be cleaner, the air purification requirement in a semiconductor manufacturing factory is met, and the dedusted gas is input into a clean room.
Example 18
The embodiment provides a method for designing a semiconductor manufacturing clean room system, comprising the following steps:
selecting the number n of the electric field devices in the multi-stage electric field dust removal system to be 2, namely, selecting two electric field devices which are connected in series and are respectively a 1 st-stage electric field device and a 2 nd-stage electric field device; the 1 st-stage electric field device and the 2 nd-stage electric field device are powered by different power supplies, the voltage of the 1 st-stage electric field device is 8.1kv, and the voltage of the 2 nd-stage electric field device is 7.2kv, so that the multi-stage electric field dust removal system meets the requirements that the total dust removal efficiency is more than or equal to 99.99 percent and the ozone output quantity is less than or equal to 30 ppm.
The present embodiment provides a clean room system 100 for semiconductor manufacturing, comprising a clean room 101, a multi-stage electric field dust removal system 102, wherein a gas inlet of the clean room 101 is communicated with an outlet of the multi-stage electric field dust removal system 102, and the multi-stage electric field dust removal system 102 comprises an electric field device 1021 (level 1 electric field device) in embodiment 1 and an electric field device 1022 (level 2 electric field device) in embodiment, which are connected in series.
The multistage electric field dust removal method provided by the embodiment comprises the following steps: the gas enters the multistage electric field dust removal system, firstly enters the 1 st-stage electric field device for ionization dust removal, then enters the 2 nd-stage electric field device for ionization dust removal, and the purified gas purified by the multistage electric field dust removal system enters the clean room. Fig. 10 is a schematic structural view of the clean room system in this embodiment.
In this embodiment, the particle numbers (PN values) of the solid particles with different sizes in the gas are respectively detected at the inlet, the outlet and the outlet of the 1 st-stage electric field device, specifically, PN values of the solid particles with particle diameters of 23nm, 0.3 μm, 0.5 μm, 1.0 μm, 3.0 μm, 5.0 μm and 10 μm are detected, the detection results are shown in table 1, and the data in table 1 are average values of 6 times of sampling. The PN value at the inlet of the 1 st stage electric field device in table 1 is the PN value in the raw gas entering the multi-stage electric field dust removal system.
In this embodiment, the concentration values of ozone in the gas are respectively detected at the inlet, the outlet and the outlet of the 1 st-stage electric field device, the detection results are shown in table 2, and the data in table 2 are average values of 6 times of sampling. The ozone concentration at the inlet of the 1 st-stage electric field device in table 2 is the ozone concentration in the raw gas entering the multi-stage electric field dust removal system.
As can be seen from tables 1-2, the semiconductor manufacturing clean room system, the multi-stage electric field dust removal system and the multi-stage electric field dust removal method designed in this embodiment enable the total dust removal efficiency of the multi-stage electric field dust removal system to be greater than 99.99%, the ozone output to be less than 30ppm, and the gas entering the clean room meets the requirements of semiconductor manufacturing.
TABLE 1
Figure PCTCN2020086849-APPB-000001
TABLE 2
Figure PCTCN2020086849-APPB-000002
Example 19
The present embodiment also provides a method for designing a multistage electric field dust removal system for a semiconductor manufacturing clean room system, comprising the steps of:
selecting the number n of the electric field devices in the multi-stage electric field dust removal system to be 3, namely, selecting three electric field devices which are connected in series and are respectively a 1 st-stage electric field device, a 2 nd-stage electric field device and a 3 rd-stage electric field device; the power supply voltage of the 1 st level electric field device is 8.1KV, the power supply voltage of the 2 nd level electric field device is 7.2KV, and the power supply voltage of the 3 rd level electric field device is 6.3KV, so that the multi-level electric field dust removal system meets the requirements that the total dust removal efficiency is more than 99.99% and the ozone output is less than 30 ppm.
The present embodiment provides a clean room system 100 for semiconductor manufacturing, comprising a clean room 101, a multi-stage electric field dust removal system 102, wherein a gas inlet of the clean room 101 is communicated with a dust removal system outlet of the multi-stage electric field dust removal system 102, and the multi-stage electric field dust removal system 102 comprises the electric field device 1021 (1 st stage electric field device) in embodiment 1, the electric field device 1022 (2 nd stage electric field device) in embodiment 1, and the electric field device 1023 (3 rd stage electric field device) in embodiment 1, which are connected in series.
The multistage electric field dust removal method provided by the embodiment comprises the following steps: gas enters the multistage electric field dust removal system, sequentially enters the 1 st-stage electric field device, the 2 nd-stage electric field device and the 3 rd-stage electric field device for ionization dust removal, and purified gas purified by the multistage electric field dust removal system enters the clean room. Fig. 11 is a schematic structural view of the clean room system in this embodiment.
In this embodiment, the particle numbers (PN values) of the solid particles with different sizes in the gas are respectively detected at the inlet and the outlet of the 1 st-stage electric field device, at the outlet of the 2 nd-stage electric field device, and at the outlet of the 3 rd-stage electric field device, specifically, PN values of the solid particles with particle diameters of 23nm, 0.3 μm, 0.5 μm, 1.0 μm, 3.0 μm, 5.0 μm, and 10 μm are detected, the detection results are shown in table 3, and the data in table 3 are average values of 6 times of sampling. In table 3, the PN value at the inlet of the 1 st stage electric field device is the PN value in the raw gas entering the multi-stage electric field dust removal system.
In this embodiment, the concentration values of ozone in the gas are respectively detected at the inlet and the outlet of the 1 st-stage electric field device, the outlet of the 2 nd-stage electric field device and the outlet of the 3 rd-stage electric field device, and the detection results are shown in table 4, where the data in table 4 are average values of 6 sampling times. The ozone concentration at the inlet of the 1 st stage electric field device in table 4 is the ozone concentration in the raw gas entering the multi-stage electric field dust removal system.
As shown in tables 3-4, the semiconductor manufacturing clean room system, the multi-stage electric field dust removal system and the multi-stage electric field dust removal method designed in this embodiment enable the total dust removal efficiency of the multi-stage electric field dust removal system to be greater than 99.99%, the ozone output to be less than 30ppm, and the gas entering the clean room meets the requirements of semiconductor manufacturing.
TABLE 3
Figure PCTCN2020086849-APPB-000003
TABLE 4
Figure PCTCN2020086849-APPB-000004
Example 20
The embodiment provides a semiconductor manufacturing method, which comprises the following steps:
a: air enters a multi-stage electric field dust removal system, and particulate matters in the air are removed through an ionization electric field generated by an electric field anode and an electric field cathode; the electric field dust removal system in this embodiment comprises the multistage electric field dust removal system of embodiment 18 or embodiment 19;
the purified gas after being dedusted by the electric field enters a clean room to provide purified gas for semiconductor manufacture in the clean room.
In a clean room, the following operations are performed:
s1, forming a film on the substrate by CVD (Chemical Vapor Deposition) or PVD (Physical Vapor Deposition) process.
S2, forming a channel on the film, wherein the channel exposes the surface of the substrate.
The trench formation includes the steps of:
coating photoresist on the surface of the film;
exposing the photoresist through a mask plate;
developing the photoresist, cleaning and removing part of the photoresist to expose part of the surface of the film;
and etching the exposed film to expose part of the surface of the substrate and form a channel.
And S3, performing ion infiltration on the substrate exposed by the channel to form a specific structure with electronic characteristics.
In this embodiment, the photoresist may be a positive photoresist or a negative photoresist.
In this embodiment, in step S1, the substrate may be made of silicon, germanium, silicon carbide, gallium arsenide, indium arsenide, or indium phosphide.
In this embodiment, in step S1, the main component of the film is one or more of silicon nitride, silicon oxide, silicon carbide, and polysilicon.
In this embodiment, in the step S2, the etching may be dry etching or wet etching.
In this embodiment, in the step S3, the ion implantation is diffusion or ion implantation.
In this embodiment, in the step S3, the electronic characteristic is a PN junction.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (4)

  1. A method for designing a multi-stage electric field dust removal system for a semiconductor manufacturing clean room system, comprising the steps of:
    the total dust removal efficiency (100% - (100% -P) of the electric field dust removal system is realized by selecting the number n of the electric field devices in the multistage electric field dust removal system and the voltage of the power supply of each electric field device1％)*(100％-P 2％)*……*(100％-P n%) is greater than or equal to a predetermined value, and the ozone output is less than or equal to a predetermined value, wherein P1％、P 2％……P n% is the dust removal efficiency of the 1 st, 2 nd and … … nth stage electric field devices respectively in sequence, and n is an integer larger than 1.
  2. The method of claim 1, wherein selecting the voltage of each E-field device power supply in the multi-stage E-field cleaning system comprises: the voltage of the power supply of each electric field device in the multi-stage electric field dust removal system is selected to be the same.
  3. The method of claim 1, wherein selecting the voltage of each E-field device power supply in the multi-stage E-field cleaning system comprises: the voltage of the power supply of each electric field device in the multi-stage electric field dust removal system is not completely the same.
  4. The method according to claim 1 or 3, wherein the selecting the voltage of each E-field device power supply in the multi-stage E-field cleaning system comprises: the voltage of each electric field device power supply in the multi-stage electric field dust removal system is selected to be completely different.
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