CN209282164U - A kind of RF discharge system and its Faraday shield configuration - Google Patents
A kind of RF discharge system and its Faraday shield configuration Download PDFInfo
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- CN209282164U CN209282164U CN201920193276.4U CN201920193276U CN209282164U CN 209282164 U CN209282164 U CN 209282164U CN 201920193276 U CN201920193276 U CN 201920193276U CN 209282164 U CN209282164 U CN 209282164U
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- bucket
- faraday shield
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- discharge system
- cover board
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Abstract
The utility model discloses a kind of RF discharge system and its Faraday shield configurations, the metal chamber housing of the RF discharge system is tightly connected by interior medium bucket and outer medium bucket and metal cover board, the metal cover board is equipped with air inlet, the outer medium casing is located on the outside of the interior medium bucket, discharge coil is arranged on the outside of the outer medium bucket, Faraday shield bucket is equipped between the interior medium bucket and the outer medium bucket, the Faraday shield bucket is connect with the metal chamber housing and the metal cover board.The utility model solves the plasma etching bombardment sputtering problem of built-in Faraday shield bucket；Faraday shield bucket built in avoiding is because of etching, sputtering, and metal ion is again caused by power couples window deposition the problem of reduction radio-frequency power coupling efficiency；The problem of also solving the high voltage arc breakdown easily occurred between the discharge coil and Faraday shield bucket of external Faraday shield bucket by hypotelorism.
Description
Technical field
The utility model relates to technical field of plasma, more particularly to a kind of RF discharge system and its faraday screen
Shield structure.
Background technique
The inductive coupled discharge plasma source of cylinder coil RF is very widely used, as etching machine, film deposition equipment,
Radio-frequency ion source and the neutral beam injection system based on radio frequency discharge etc..Its working principle is that: in cylinder coil RF perception
In coupled discharge, several circle discharge coils are wound in medium bucket (general using quartz or ceramic) outer wall, then by discharge coil
On be passed through radio-frequency current, will ionize the working gas in quartz barrel, form plasma.During the work time, in order to protect
Medium bucket does not shorten the service life because of the bombardment of electrostatic field acceleration ion, and perhaps damage generally can be in the inside or outside of medium bucket
Place the Faraday shield bucket of a ground connection.
Referring to FIG. 1, Fig. 1 is Faraday shield barrel structure schematic diagram built in traditional RF discharge system, in wire chamber
Screwed cylinder 2 is welded on room 1 (stainless steel material), quartz barrel 4 is inserted into the inside, then passes through O-ring vacuum sealing.
Discharge coil 3 (generally being formed with copper pipe coiling) is wound on the outside of quartz barrel 4, the number of turns is from one to tens of circles etc.；Sealing quartz
The air inlet of working gas entrance is provided at its axle center of metal seal 6 on 4 tops of bucket.In quartz barrel 4, it is close to quartz barrel 4
Inner wall place a Faraday shield bucket 5, Faraday shield bucket 5 and metal chamber 1 and metal seal 6 are attached (gold
Belong to Hard link, i.e., it is conductive, but blow-by).
The effect of Faraday shield bucket 5 is in 1 effective grounding of Faraday shield bucket 5 and metal chamber (typically grounded line)
Afterwards, can the electrostatic field that is formed of high-voltage end on shielded radio frequency coil 3 and low-pressure end, to inhibit plasma to quartz barrel 4
Etching, effectively prevent plasma to the sputter damage of quartz barrel 4, extend the service life of quartz barrel 4.But in reality
, it can be seen that although built-in Faraday shield bucket 5 is able to suppress most radio frequency electrostatic field, due to it in use process
In the plasma, ion can carry out bombardment sputtering, etching to 5 surface of Faraday shield bucket, so as to cause metallic atom for submergence
It enters and pollutes plasma in plasma；And the metallic atom sputtered out can be deposited to again on 4 inner wall of quartz barrel
Metal film is formed, radio frequency electromagnetic field is reduced and is incident on inside quartz barrel 4.In addition, with the extension of use time, faraday screen
Water cooling position can be etched by covering the part of bucket 5, to leak easily occur, the problem of vacuum degree not can guarantee.
Referring to FIG. 2, Fig. 2 is traditional external Faraday shield barrel structure schematic diagram of RF discharge system；In wire chamber
Screwed cylinder 2 is welded on room 1, quartz barrel 4 is inserted into the inside, then by O-ring vacuum sealing, seals quartz barrel 4
The air inlet of working gas entrance is provided at its axle center of the metal seal 6 on top.A farad is cased on the outside of quartz barrel
Shielding bucket 5, Faraday shield bucket 5 are grounded simultaneously with the effective Hard link of metal chamber 1.It is twined on the outside of Faraday shield bucket 5
Around several circle discharge coils 3；When being passed through radio-frequency current in discharge coil 3, so that it may generate penetration by electromagnetic fields Faraday shield
Bucket 5 reaches 4 core of quartz barrel, generates and maintain plasma.From figure 2 it can be seen that the faraday of discharge coil 3 and ground connection
It is close to shield bucket 5, and when 3 input radio frequency electric current of discharge coil, certainly exist a radio frequency high tension end, therefore 3 He of discharge coil
It will form strong electrostatic field between Faraday shield bucket 5, it is easy to which breakdown sparking burns out discharge coil 3 or Faraday shield
Bucket 5.
In conclusion the setting of the Faraday shield bucket of ground connection, can effectively reduce the voltage drop shape on discharge coil
At capacitive field (electrostatic field)；And do not influence the electric current on coil generation electromagnetic field (electromagnetic field can pass through Faraday shield
The intermediate gap of bucket penetrates into), to reduce the ion bombardment medium window in plasma, protect medium window and extend Jie
The working life of matter window.But built-in Faraday shield bucket is to submerge in the plasma, and plasma can be etched and be splashed to it
It penetrates, the metal atom contamination plasma for being sputtered out；Even medium bucket inner wall is redeposited again for metallic atom, forms fine and close gold
Belong to film, reduces penetrating for the electromagnetic field that the radio-frequency current on coil generates, reduce the coupling efficiency of radio-frequency power；External
Faraday shield bucket is easy to form high voltage arc between coil, and breakdown burns out coil or Faraday shield bucket, thus cannot
Generate plasma.
Utility model content
The purpose of the utility model is to provide a kind of RF discharge system and its Faraday shield configurations, above-mentioned existing to solve
The problem of with the presence of technology, is not directly contacted with Faraday shield bucket with plasma, and avoids the high pressure between discharge coil
Sparking.
To achieve the above object, the utility model provides following scheme:
The utility model provides a kind of RF discharge system Faraday shield configuration, the gold of the RF discharge system
Belonging to chamber housing to be tightly connected by interior medium bucket and outer medium bucket and metal cover board, the metal cover board is equipped with air inlet,
The outer medium casing is located on the outside of the interior medium bucket, is arranged with discharge coil, the interior medium on the outside of the outer medium bucket
It is equipped with Faraday shield bucket between bucket and the outer medium bucket, the Faraday shield bucket and the metal chamber housing and described
Metal cover board connection.
Preferably, it is equipped between radial direction between the interior medium bucket and/or the outer medium bucket and the Faraday shield bucket
Gap, the radial clearance are communicated with inlet and outlet, and the water inlet is for being passed through cooling Jie into the radial clearance
Matter, the water outlet are flowed out for the cooling medium.
Preferably, the water inlet and the water outlet are arranged on the metal cover board and through the metal covers
Plate, the water inlet and the water outlet are arranged relative to the axisymmetrical of the radial clearance.
Preferably, the cooling medium is deionized water.
Preferably, the Faraday shield bucket includes upper becket, lower becket and several described upper beckets of connection
With the metal pillar of the lower becket, circumferential gap, the upper becket and the lower gold are equipped between the metal pillar
Belong to ring to connect with the metal cover board and the metal chamber housing respectively.
Preferably, the upper becket, the lower becket and the metal pillar are hollow structure and communicate with each other,
The upper becket or the lower becket are equipped with inlet and outlet.
Preferably, the circumferential gap is 2-10mm.
Preferably, the material of the Faraday shield bucket, the metal chamber housing and the metal cover board is stainless
Steel, the Faraday shield bucket are grounded by the metal chamber housing.
Preferably, the outer medium casing and the interior medium bucket and the metal cover board and the metal chamber housing it
Between be equipped with sealing ring, the metal cover board and the metal chamber housing are equipped with for being clamped the sealing ring, described outer
The annular groove of medium casing and the interior medium bucket.
The utility model additionally provides a kind of RF discharge system, including penetrating as described in any one of above-mentioned technical proposal
Frequency discharge system Faraday shield configuration, the discharge coil are connected with radio frequency power source by matching network.
The utility model achieves following technical effect compared with the existing technology:
The utility model solves built-in method by being arranged Faraday shield bucket between interior medium bucket and outer medium bucket
Draw the plasma etching bombardment sputtering problem of shielding bucket；Built-in Faraday shield bucket is avoided because of etching, sputtering, metal
Ion reduces the problem of radio-frequency power coupling efficiency caused by power couples window deposition again；Also solve external farad
The problem of high voltage arc breakdown easily occurred between the discharge coil and Faraday shield bucket of shielding bucket by hypotelorism.
In addition, the utility model is radial by being arranged between interior medium bucket and/or outer medium bucket and Faraday shield bucket
Gap, and so that cooling medium is circulated by inlet and outlet, week is equipped between the metal pillar of Faraday shield bucket in addition
To gap, enables Faraday shield bucket and the effective cooled medium of medium bucket cooling, improve the plasma to be formed
Stability.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is Faraday shield barrel structure schematic diagram built in traditional RF discharge system；
Fig. 2 is traditional external Faraday shield barrel structure schematic diagram of RF discharge system；
Fig. 3 is the schematic diagram of the utility model RF discharge system Faraday shield configuration；
In Fig. 1 and Fig. 2: 1- metal chamber, 2- cylinder, 3- discharge coil, 4- quartz barrel, 5- Faraday shield bucket, 6- gold
Belong to sealing element.
In Fig. 3: 1- metal chamber housing, 2- annular groove, the outer medium bucket of 3-, 4- discharge coil, 5- Faraday shield bucket, in 6-
Medium bucket, 7- metal cover board, 8- water inlet, 9- air inlet, 10- water outlet.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that term "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outside" etc.
The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description the utility model
It is described with simplifying, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation structure
It makes and operates, therefore should not be understood as the limitation to scope of protection of the utility model.
It is as shown in Figure 3: to present embodiments provide a kind of RF discharge system Faraday shield configuration, RF discharge system
Metal chamber housing 1 be tightly connected by interior medium bucket 6 and outer medium bucket 3 and metal cover board 7, specifically, outer 3 He of medium bucket
The material of interior medium bucket 6 is preferably quartzy or ceramics, and outer medium bucket 3 and interior medium bucket 6 and metal cover board 7 and metal chamber shell
Be equipped with sealing ring between body 1 and carry out vacuum sealing, metal cover board 7 and metal chamber housing 1 be equipped with for be clamped sealing ring,
The annular groove 2 of outer medium bucket 3 and interior medium bucket 6.
Outer medium bucket 3 is set in interior 6 outside of medium bucket, is arranged with discharge coil 4, interior 6 He of medium bucket on the outside of outer medium bucket 3
Faraday shield bucket 5 is equipped between outer medium bucket 3, the material of Faraday shield bucket 5, metal chamber housing 1 and metal cover board 7 is equal
For stainless steel, Faraday shield bucket 5 is grounded by metal chamber housing 1.
Faraday shield bucket 5 includes the gold of upper becket, lower becket and several connections upper becket and lower becket
Belong to pillar, is equipped with circumferential gap between metal pillar, circumferential gap is chosen as 2-10mm.Faraday shield bucket 5 and metal chamber
Shell 1 and metal cover board 7 connect, and specially upper becket is connect with metal cover board 7, and lower becket and metal chamber housing 1 connect
It connects.
7 center of metal cover board is equipped with air inlet 9, for being passed through working gas.
In addition, being equipped with radial clearance between interior medium bucket 6 and outer medium bucket 3 and Faraday shield bucket 5, radial clearance is constituted
Water-cooling channel and it is communicated with water inlet 8 and water outlet 10, water inlet 8 and water outlet 10 are arranged on metal cover board 7 and run through
Metal cover board 7, water inlet 8 and water outlet 10 are arranged relative to the axisymmetrical of radial clearance.Water inlet 8 is used for water-cooling channel
In be passed through cooling medium, water outlet 10 is flowed out for cooling medium, and cooling medium is preferably deionized water.Water inlet 8 and water outlet
Mouth 10 can be connected to by water pump with cooling medium cabinet circulation.
It should be understood that cooling structure is without being limited thereto, upper becket, lower becket and metal pillar can also be hollow
It structure and communicates with each other, water inlet 8 and the setting of water outlet 10 are drawn on upper becket and from metal cover board 7.
The present embodiment additionally provides a kind of RF discharge system, including above-mentioned RF discharge system Faraday shield knot
Structure, discharge coil 4 are connected with radio frequency power source by matching network.
The RF discharge system of the present embodiment and its working principle of Faraday shield configuration are as follows:
By water inlet 8 and water outlet 10 using cooling medium to Faraday shield bucket 5, interior quartz barrel and outer quartz barrel into
Row cooling, radio frequency power source are opened, and are loaded on discharge coil 4 by matching network, the electromagnetism that discharge coil 4 can generate at this time
Wave and electrostatic field, electrostatic field can largely be blocked by Faraday shield bucket 5, and electromagnetic field can through Faraday shield bucket 5 it
Between circumferential gap be transmitted to interior quartz barrel core, when working gas by air inlet 9 be input to interior quartz barrel inside after, will
It generates and maintains plasma.
It applies specific case in this specification to be expounded the principles of the present invention and embodiment, the above reality
The explanation for applying example is merely used to help understand the method and its core concept of the utility model；Meanwhile for the general of this field
Technical staff, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.To sum up institute
It states, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. a kind of RF discharge system Faraday shield configuration, it is characterised in that: the metal chamber of the RF discharge system
Shell is tightly connected by interior medium bucket and outer medium bucket and metal cover board, and the metal cover board is equipped with air inlet, described outer
Medium casing is located on the outside of the interior medium bucket, is arranged with discharge coil, the interior medium bucket and institute on the outside of the outer medium bucket
It states and is equipped with Faraday shield bucket, the Faraday shield bucket and the metal chamber housing and the metal cover between outer medium bucket
Plate connection.
2. RF discharge system Faraday shield configuration according to claim 1, it is characterised in that: the interior medium bucket
And/or radial clearance is equipped between the outer medium bucket and the Faraday shield bucket, the radial clearance is communicated with water inlet
And water outlet, the water inlet is for being passed through cooling medium into the radial clearance, and the water outlet is for cooling Jie
Mass flow goes out.
3. RF discharge system Faraday shield configuration according to claim 2, it is characterised in that: the water inlet and
The water outlet is arranged on the metal cover board and through the metal cover board, and the water inlet and the water outlet are opposite
It is arranged in the axisymmetrical of the radial clearance.
4. RF discharge system Faraday shield configuration according to claim 2, it is characterised in that: the cooling medium
For deionized water.
5. RF discharge system Faraday shield configuration according to claim 1, it is characterised in that: the faraday screen
Cover bucket include upper becket, lower becket and several connect the metal pillar of the upper becket and the lower becket, institute
State and be equipped with circumferential gap between metal pillar, the upper becket and the lower becket respectively with the metal cover board and described
The connection of metal chamber housing.
6. RF discharge system Faraday shield configuration according to claim 5, it is characterised in that: the upper metal
Ring, the lower becket and the metal pillar are hollow structure and communicate with each other, the upper becket or the lower metal
Ring is equipped with inlet and outlet.
7. RF discharge system Faraday shield configuration according to claim 5, it is characterised in that: the circumferential gap
For 2-10mm.
8. RF discharge system Faraday shield configuration according to claim 1, it is characterised in that: the faraday screen
The material for covering bucket, the metal chamber housing and the metal cover board is stainless steel, and the Faraday shield bucket passes through described
Metal chamber housing ground connection.
9. RF discharge system Faraday shield configuration according to claim 1, it is characterised in that: the outer medium bucket
Sealing ring, the metal cover board are equipped between set and the interior medium bucket and the metal cover board and the metal chamber housing
The ring for being clamped the sealing ring, the outer medium casing and the interior medium bucket is equipped with the metal chamber housing
Slot.
10. a kind of RF discharge system, it is characterised in that: including radio frequency discharge system as claimed in any one of claims 1-9 wherein
System Faraday shield configuration, the discharge coil are connected with radio frequency power source by matching network.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920193276.4U CN209282164U (en) | 2019-02-13 | 2019-02-13 | A kind of RF discharge system and its Faraday shield configuration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920193276.4U CN209282164U (en) | 2019-02-13 | 2019-02-13 | A kind of RF discharge system and its Faraday shield configuration |
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| CN209282164U true CN209282164U (en) | 2019-08-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109686645A (en) * | 2019-02-13 | 2019-04-26 | 大连理工大学 | A kind of RF discharge system and its Faraday shield configuration |
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2019
- 2019-02-13 CN CN201920193276.4U patent/CN209282164U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109686645A (en) * | 2019-02-13 | 2019-04-26 | 大连理工大学 | A kind of RF discharge system and its Faraday shield configuration |
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