WO2006049125A1 - 成膜装置及び成膜方法 - Google Patents
成膜装置及び成膜方法 Download PDFInfo
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- WO2006049125A1 WO2006049125A1 PCT/JP2005/020004 JP2005020004W WO2006049125A1 WO 2006049125 A1 WO2006049125 A1 WO 2006049125A1 JP 2005020004 W JP2005020004 W JP 2005020004W WO 2006049125 A1 WO2006049125 A1 WO 2006049125A1
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- processed
- heating means
- film forming
- auxiliary heating
- film
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02118—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer carbon based polymeric organic or inorganic material, e.g. polyimides, poly cyclobutene or PVC
- H01L21/0212—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer carbon based polymeric organic or inorganic material, e.g. polyimides, poly cyclobutene or PVC the material being fluoro carbon compounds, e.g.(CFx) n, (CHxFy) n or polytetrafluoroethylene
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4581—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber characterised by material of construction or surface finish of the means for supporting the substrate
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/46—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for heating the substrate
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/08—Reaction chambers; Selection of materials therefor
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/10—Heating of the reaction chamber or the substrate
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/12—Substrate holders or susceptors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
Definitions
- the present invention relates to a film forming apparatus and a film forming method for depositing a thin film on the surface of an object to be processed such as a semiconductor wafer by thermal CVD (Chemical Vapor Deposition) or plasma CVD.
- thermal CVD Chemical Vapor Deposition
- plasma CVD plasma CVD
- a thermal CVD process or a plasma CVD process using plasma is used as a film forming process for forming a thin film on a semiconductor wafer or the like.
- a relatively low pressure of about 0.1 lmTorr (13.3 mPa) to several tens of mTorr (several Pa) is possible!
- a plasma can be stably generated even in a high vacuum state. Therefore, a plasma processing apparatus that generates high-density plasma using microwaves tends to be used.
- FIG. 9 is a schematic configuration diagram showing a conventional general microwave plasma processing apparatus.
- the plasma processing apparatus 102 includes a processing container 104 that can be evacuated, and a mounting table 106 on which a semiconductor wafer W provided in the processing container 104 is mounted.
- a heater 107 is provided inside the mounting table 106.
- a ceiling plate 108 made of a disk-shaped aluminum nitride, quartz, or the like that transmits microwaves is airtightly provided on the ceiling portion facing the mounting table 106.
- a disc-shaped planar antenna member 110 having a thickness of about several millimeters is provided on the upper surface or above the top plate 108.
- a slow wave material 112 made of a dielectric is provided on the upper surface or the upper side of the planar antenna member 110.
- a ceiling cooling jacket 114 having a cooling water passage through which cooling water flows is provided above the slow wave material 112.
- the planar antenna member 110 is formed with a large number of microwave radiation holes 116 made of, for example, long groove-like through holes.
- the microwave radiation holes 116 are generally arranged concentrically or in a spiral shape.
- an inner cable 120 of the coaxial waveguide 118 is connected to the center of the planar antenna member 110 so that, for example, a 2.45 GHz microwave generated by a microwave generator (not shown) is guided. ing .
- the microwaves are emitted from the microwave radiation holes 116 provided in the planar antenna member 110 while propagating radially in the radial direction of the antenna member 110, pass through the top plate 108, and enter the processing container 104. And introduced.
- plasma is generated in the processing space S in the processing vessel 104 to which Ar gas or C F gas is supplied as processing gas.
- a fluorocarbon (CF) film can be formed on the semiconductor wafer W heated to a predetermined temperature on the mounting table 106.
- a guide ring for positioning the wafer and a focus ring for concentrating the plasma at the center are provided on the outer peripheral side of the semiconductor wafer W.
- the in-plane uniformity of the film thickness of the deposited film formed on the wafer surface is very important for improving the product yield and the like.
- the film thickness of this deposited film varies greatly depending on various factors such as process temperature and process pressure.
- In-plane uniformity of the film thickness of the deposited film is to maintain a high in-plane uniformity of the wafer temperature during the process. It is particularly important to increase
- the film processing is performed particularly on the periphery of the wafer.
- the film thickness of the deposited film tends to be slightly thinner than the film thickness of the rest of the wafer. That is, the in-plane uniformity of the film thickness of the deposited film in the wafer surface tends to be inferior.
- the reason for this may be that the amount of precursor (precursor) existing in the middle of the gas phase reaction is lower than the wafer central part above the wafer peripheral part during film formation.
- An object of the present invention is to provide a film forming apparatus and a film forming method capable of greatly improving the in-plane uniformity of the film thickness of a deposited film.
- the present invention includes a processing container in which the inside can be evacuated, a mounting table provided in the processing container for mounting the object to be processed, and a film forming gas in the processing container
- a gas supply means for supplying a predetermined gas
- a plasma forming means for generating plasma in the processing container
- a heating means for heating the object to be processed
- auxiliary heating means provided so as to be slightly separated from the periphery of the object to be processed via the object force gap, and control means for controlling the operation of the entire apparatus.
- a film forming apparatus including the film forming device.
- the auxiliary heating means heats the atmosphere located above the auxiliary heating means with little thermal influence on the object to be processed. This makes it possible to move the precursor, which is a relatively heavy molecule present in the atmosphere and contributes to film formation, to above the periphery of the object to be processed. As a result, a decrease in film thickness in the peripheral portion of the object to be processed that tends to decrease in thickness compared to the central portion is compensated, and a thin film having a sufficient thickness can be formed. That is, the in-plane uniformity of the film thickness can be maintained high.
- the plasma forming means includes a planar antenna member for introducing a microwave into the processing container.
- the surface of the auxiliary heating means is a protection made of yttria (Y ⁇ ).
- a film is formed.
- the plasma resistance is improved, i.e., the plasma is not scraped. Therefore, the generation of particles can be suppressed accordingly.
- the gas supply means has an aluminum shower head.
- the present invention provides a processing container in which the inside can be evacuated, a mounting table provided in the processing container for mounting an object to be processed, and a film forming gas into the processing container.
- a gas supply means for supplying a predetermined gas
- a heating means for heating the object to be processed
- a peripheral part of the upper surface of the mounting table on the outer side of the peripheral part of the object to be processed.
- a film forming apparatus comprising: an auxiliary heating unit provided so as to be slightly separated from a target object through a gap; and a control unit for controlling the operation of the entire apparatus.
- the auxiliary heating means heats the atmosphere located above the auxiliary heating means that hardly affects the object to be processed. This makes it possible to move the precursor, which is a relatively heavy molecule existing in the atmosphere and contributes to film formation, to the upper part of the periphery of the object to be processed. As a result, a decrease in film thickness in the peripheral portion of the object to be processed that tends to decrease in thickness compared to the central portion is compensated, and a thin film having a sufficient thickness can be formed. That is, the in-plane uniformity of the film thickness can be maintained high.
- the auxiliary heating means is formed in a ring shape.
- the auxiliary heating means is formed by covering the entire resistance heater with a heat resistant material.
- the upper surface of the auxiliary heating means is set to be equal to or lower than the horizontal level of the upper surface of the object to be processed placed on the mounting table.
- the width of the gap is set within a range of 0.3 to 2. Omm.
- control unit is configured to make the set temperature of the auxiliary heating unit higher than the set temperature of the heating unit.
- the object to be processed is mounted on a mounting table provided inside a processing container that can be evacuated, and the processing object is heated to a predetermined temperature by a heating unit.
- a film forming gas is supplied into the container and the film is processed on the surface of the object to be processed
- the step of disposing auxiliary heating means on the periphery of the upper surface of the mounting table so as to be slightly spaced outside the periphery of the object to be processed via the object body force gap Setting the set temperature of the auxiliary heating means higher than the set temperature of the heating means, and moving the atmosphere located above the auxiliary heating means upward to the periphery of the object to be processed. It is the film-forming method characterized by having provided.
- the auxiliary heating means heats the atmosphere located above the auxiliary heating means, which hardly affects the object to be processed, and exists in the atmosphere.
- a precursor that is a relatively heavy molecule and contributes to film formation can be moved above the periphery of the object to be processed.
- a decrease in film thickness in the peripheral portion of the object to be processed, which tends to decrease in thickness as compared with the central portion is compensated, and a thin film having a sufficient thickness can be formed. That is, the in-plane uniformity of the film thickness can be maintained high.
- the object to be processed is mounted on a mounting table provided in a vacuum-evacuable processing container, and the object to be processed is heated to a predetermined temperature by a heating unit.
- a film forming method in which a film forming gas is supplied into a container to perform a film forming process on the surface of the object to be processed, the peripheral part of the upper surface of the mounting table is disposed outside the peripheral part of the object to be processed.
- the auxiliary heating means is disposed so as to be slightly separated through the object body force gap, and the set temperature of the auxiliary heating means is set higher than the set temperature of the heating means.
- a computer-readable recording medium including a program for controlling a film forming method, the method comprising: moving an atmosphere located above to a position above a peripheral portion of the object to be processed.
- FIG. 1 is a configuration diagram showing an embodiment of a film forming apparatus according to the present invention.
- FIG. 2 is a bottom view showing a shower head portion of a gas supply means.
- FIG. 3 is a plan view showing the positional relationship between the object to be processed placed on the placing table and the auxiliary heating means.
- FIG. 4 is a partially enlarged sectional view showing a part of the mounting table.
- FIG. 5 is a schematic diagram for explaining the behavior of the precursor on the mounting table.
- FIG. 6A and FIG. 6B are schematic views showing the film thickness distribution of the film deposited on the wafer.
- FIG. 7 is a graph showing changes in the amount of contamination when a protective film made of yttria is used.
- FIG. 8 is a schematic cross-sectional view showing a thermal CVD film forming apparatus to which the present invention is applied.
- FIG. 9 is a schematic configuration diagram showing a conventional general plasma processing apparatus.
- FIG. 1 is a configuration diagram showing an embodiment of a film forming apparatus according to the present invention.
- FIG. 2 is a bottom view showing the shower head portion of the gas supply means.
- FIG. 3 is a plan view showing a positional relationship between the object to be processed placed on the placing table and the auxiliary heating means.
- FIG. 4 is a partially enlarged sectional view showing a part of the mounting table.
- FIG. 5 is a schematic diagram for explaining the behavior of the precursor on the mounting table.
- the film formation apparatus a plasma processing apparatus that forms plasma by microwaves and performs film formation by plasma CVD will be described.
- a plasma processing apparatus 22 that is a film forming apparatus of the present embodiment has a processing container 24 that is entirely formed into a cylindrical shape.
- the side wall and the bottom of the processing vessel 24 are made of a conductor such as aluminum and are grounded.
- the inside of the processing vessel 24 is configured as a sealed processing space S, and plasma is formed in the processing space S.
- a mounting table 26 for mounting, for example, a semiconductor wafer W as an object to be processed is accommodated on the upper surface.
- the mounting table 26 is formed in a flat disk shape made of anodized aluminum or the like, for example. Alternatively, as will be described later, it can be formed by a ceramic such as A1N.
- the mounting table 26 is supported by a support 28 made of, for example, aluminum, which stands up from the bottom of the processing container 24.
- a gate valve 30 that opens and closes for loading / unloading a wafer into / from the inside of the processing container 24 is provided on the side wall of the processing container 24. Further, an exhaust port 32 is provided at the bottom of the processing container 24. An exhaust passage 34 to which a pressure control valve 35 and a vacuum pump 37 are sequentially connected is connected to the exhaust port 32. As a result, the inside of the processing vessel 24 can be evacuated to a predetermined pressure as required. [0033] Further, the ceiling of the processing container 24 is open (has an opening).
- a top plate 36 that is permeable to microwaves is airtightly provided through a seal member 38 such as an O-ring.
- the top plate 36 is made of a ceramic material such as Al 2 O 3, for example. Top plate 36 thickness
- the length is set to about 20 mm, for example.
- Plasma forming means 40 for generating plasma in the processing vessel 24 is provided on the top surface of the top plate 36.
- the plasma forming means 40 has a disk-shaped planar antenna member 42 provided on the upper surface of the top plate 36.
- a slow wave material 44 having a high dielectric constant characteristic is provided on the planar antenna member 42.
- the substantially entire upper and side surfaces of the slow wave member 44 are covered with a waveguide box 46 made of a conductive hollow cylindrical container.
- the flat antenna member 42 is configured as a bottom plate of the waveguide box 46 and faces the mounting table 26.
- a cooling jacket 48 through which a coolant for cooling the wave guide box 46 flows is provided.
- the peripheral portions of the waveguide box 46 and the planar antenna member 42 are both electrically connected to the processing container 24.
- the outer tube 50A of the coaxial waveguide 50 is connected to the center of the upper surface of the waveguide box 46.
- the internal cable 50B inside the coaxial waveguide 50 is connected to the central portion of the planar antenna member 42 through the through hole at the center of the slow wave member 44.
- the coaxial waveguide 50 is connected via a mode converter 52 and a waveguide 54 to, for example, a 2.45 GHz microwave generator 56 having matching (not shown).
- a 2.45 GHz microwave generator 56 having matching (not shown).
- microwaves can be propagated to the planar antenna member 42.
- the frequency of the microwave is not limited to 2.45 GHz, and may be another frequency, for example, 8.35 GHz.
- the waveguide 54 a waveguide having a circular cross section or a rectangular cross section, or a coaxial waveguide can be used.
- the slow wave material 44 having a high dielectric constant characteristic provided on the upper surface of the planar antenna member 42 in the waveguide box 46 acts to shorten the in-tube wavelength of the microwave by the wavelength shortening effect.
- the slow wave material 44 for example, aluminum nitride or the like can be used.
- the planar antenna member 42 corresponds to a 300 mm size wafer
- the planar antenna member 42 is formed of a conductive material force having a diameter of S350 to 500 mm and a thickness of about 0.5 mm. More specifically, for example, a copper plate or aluminum plate force having a silver-plated surface can be formed.
- the planar antenna member 42 has a number of microwave radiation holes 58 formed of, for example, long groove-like through holes. It is made.
- the arrangement form of the microwave radiation holes 58 is not particularly limited. For example, they can be arranged concentrically, spirally, radially, and the like. Alternatively, it can be evenly distributed over the entire surface of the planar antenna member. Further, a set in which the two microwave radiation holes 58 are slightly separated and arranged in a substantially T shape may be arranged concentrically or spirally.
- a gas supply means 60 for supplying a film forming gas or the like into the processing container 24 is provided above the mounting table 26.
- the gas supply means 60 is formed in the middle of a gas flow path 62 formed in a lattice shape, a ring-shaped gas flow path 62A, and the gas flow path 62.
- a shower head portion 66 having a large number of gas injection holes 64 is also provided. In this case, both ends of each grid-shaped gas flow path 62 are connected to a ring-shaped gas flow path 62A so that the gas can flow sufficiently through each gas flow path 62.
- a large number of openings 68 are formed so as to escape in the vertical direction at positions avoiding the gas flow paths 62 and 62A. Through this opening 68, gas can flow in the vertical direction.
- the entire shower head 66 can be formed of quartz, aluminum or the like in order to maintain durability in relation to the film forming gas.
- a CF-based gas is used as the film forming gas, it is preferably formed of aluminum. In this case, since the CF-type gas fluorine and aluminum form a corrosion-resistant aluminum film on the surface of the shower head 66, the durability can be further improved.
- a gas passage 70 extending to the outside is connected to the ring-shaped gas passage 62A.
- This gas passage 70 is branched into a plurality of branch passages on the way, and each branch passage is connected to each gas source with an on-off valve 72 and a flow rate controller 74 such as a mass flow controller interposed therebetween.
- the gas source for example, an Ar gas source 76A for storing Ar gas as an inert gas for plasma, an H gas source 76B for storing H gas, and a film forming gas
- a C F gas source 76C that stores C F gas is used.
- the shower head part 66 is provided in two upper and lower stages, and Ar gas and H gas are allowed to flow from one of them.
- a configuration in which CF gas flows from the other side may be adopted.
- a plurality of, for example, three lifting pins 78 (only two are shown in FIG. 1) for moving the wafer W up and down when the wafer W is loaded and unloaded are provided.
- This rise The descending pin 78 is moved up and down by an elevating rod 82 provided so as to penetrate the bottom of the container via an extendable bellows 80.
- the mounting table 26 is formed with a pin insertion hole 84 through which the elevating pin 78 is inserted.
- the entire mounting table 26 is made of a heat-resistant material, for example, ceramic such as A1N.
- a heating means 86 is provided in the heat resistant material.
- the heating means 86 of the present embodiment includes a thin plate-like resistance heater 88 embedded over substantially the entire area of the mounting table 26.
- the resistance heater 88 is connected to a heater power source 92 via a wiring 90 that passes through the column 28. Note that an electrostatic chuck that holds Ueno and W by suction can be provided on the mounting table 26.
- the mounting table 26 formed as described above is provided with auxiliary heating means 94 that is a feature of the present invention.
- the auxiliary heating means 94 is arranged on the periphery of the upper surface of the mounting table 26 so as to be slightly separated from the periphery of the wafer W via the gap 96.
- the auxiliary heating means 94 of the present embodiment is formed in a ring shape so as to surround the periphery of the wafer W as shown in FIG.
- the whole auxiliary heating means 94 is formed of a heat resistant material 98.
- the heat resistant material 98 for example, a ceramic material made of A1N or SiC can be used.
- a thin plate-like resistance heater 100 is embedded in the heat-resistant material 98.
- the resistance heater 100 is connected to a heater power source 104 by a wiring 102 disposed through the mounting table 26 and the support column 28.
- the heat-resistant material 98 is formed, for example, in a rectangular cross section.
- a protective film 106 having durability against plasma and durability against plasma cleaning using a cleaning gas is formed on the entire surface of the heat resistant material 98.
- yttria Y 2 O 3
- Yttria is for example sprayed
- the width H 3 of the auxiliary heating means 94 is about 20 mm, and the distance HI between the mounting table 26 and the top plate 36 is about 100 mm.
- the width H2 of the gap 96 is such that the positioning accuracy when the wafer W is transferred, the distance at which the auxiliary heating means 94 does not affect the wafer itself, and the upper side of the auxiliary heating means 94 In consideration of the behavior of the precursor, for example, it is set within the range of 0.3 to 2. Omm . If the width H2 of the gap 96 is smaller than 0.3 mm, the wafer may not be transferred properly. On the other hand, if the width H2 of the gap 96 is larger than 2. Omm, there is a possibility that the precursor floating above the auxiliary heating means 94 cannot be floated to an appropriate position.
- the upper surface of the auxiliary heating means 94 is set to have the same force as the horizontal level of the upper surface of the wafer W mounted on the mounting table 26 or less. That is, when the auxiliary heating means 94 is viewed in the horizontal direction from the upper surface of the wafer W, the auxiliary heating means 94 is set in such a state that it cannot be visually recognized. As a result, the upper surface of the peripheral portion of the wafer W does not receive radiant heat from the auxiliary heating means 94. Thereby, the thermal influence on the peripheral part of the wafer W from the auxiliary heating means 94 is suppressed as much as possible.
- the overall operation of the plasma processing apparatus 22 is controlled by a control means 108 such as a microcomputer.
- a computer program for performing this operation is stored in a storage medium 110 such as a flexible disc, CD (Compact Disc), or flash memory.
- a storage medium 110 such as a flexible disc, CD (Compact Disc), or flash memory.
- each gas supply and flow rate control, microwave supply and power control, temperature control of each heating means 86 and 94, process pressure control, etc. are performed. It's like! /
- the semiconductor wafer W is accommodated in the processing container 24 via the gate valve 30 by a transfer arm (not shown).
- the semiconductor wafer W is mounted on the mounting surface which is the upper surface of the mounting table 26 by moving the lifting pins 78 up and down.
- the inside of the processing vessel 24 is maintained within a predetermined process pressure, for example, within a range of 0.01 to several Pa, and, for example, argon gas and film-forming gas (from the shower head portion 66 of the gas supply means 60 ( CF gas) is supplied while the flow rate is controlled.
- a predetermined process pressure for example, within a range of 0.01 to several Pa
- argon gas and film-forming gas from the shower head portion 66 of the gas supply means 60 ( CF gas) is supplied while the flow rate is controlled.
- Microwaves generated by the living vessel 56 are supplied to the planar antenna member 42 via the waveguide 54 and the coaxial waveguide 50. Thereby, in the processing space S, a microwave whose wavelength is shortened by the action of the slow wave material 44 is introduced, and plasma is generated. Thereby, a predetermined plasma CVD process is performed. At this time, the wafer W on the mounting table 26 is heated by the heating means 8.
- the resistance heater 88 of 6 maintains the predetermined process temperature substantially uniformly in the surface.
- the microwave is introduced into the processing space S immediately below the planar antenna member 42 as described above.
- This microwave excites argon gas into plasma, diffuses downward, and activates the CF gas, which is a film-forming gas, to produce active species.
- the active species include argon gas, diffuses downward, and activates the CF gas, which is a film-forming gas, to produce active species.
- a CF film is formed on the surface of the wafer W.
- the force depending on the process temperature Generally, the wafer W receives radiant heat from the plasma generated in the processing space S. For this reason, the wafer W is heated not only by the heating means 86 but also by ion irradiation with the plasma force.
- the gas in the processing space S diffuses substantially uniformly around the periphery of the wafer W while flowing down the processing space S, and is exhausted from the exhaust port 32 at the bottom of the container.
- the film forming gas causes a gas phase reaction. This gas phase reaction is promoted by the active species. In the process of this gas phase reaction, a precursor made of a relatively heavy molecule such as CF is generated. This precursor is even more
- the amount of 5 8 was about 300 sccm, and the process pressure was about 7 Pa (50 mTorr). Further, the set temperature of the heating means 86 of the mounting table 26 was about 380 ° C., and the set temperature of the auxiliary heating means 94 was about 400 ° C. which was higher than the set temperature of the calo heat means 86. At this time, the wafer temperature was about 350 ° C.
- the precursor that promotes the deposition amount of the deposited film flows in the gas flow direction, but the trend is also defined by thermal diffusion.
- precursors tend to gather in areas where the temperature is relatively low.
- the temperature of the mounting table portion on the outer side of the wafer edge is relatively low.
- the precursor has moved above the outer region of the wafer edge, which is a cold part.
- the amount of film formation at the wafer peripheral portion is reduced and the in-plane uniformity of the film thickness is reduced as the precursor concentration is lowered in the region above the wafer peripheral portion. .
- Auxiliary heating means 94 is provided so as to surround the periphery of the wafer w, with the wafer W force separated by a slight gap 96 without contacting the wafer W.
- the temperature of the auxiliary heating means 94 was set slightly higher than that of the heating means 86 provided on the mounting table 26. As a result, as shown in FIG. 5, the atmosphere in the region Ml above the auxiliary heating means 94 was heated by the auxiliary heating means 94.
- the atmosphere in the region Ml is heated to a higher temperature than in the case of the conventional apparatus, so that the precursor existing in the region Ml has a slight temperature above the periphery of the wafer W. It will move to the lower area M2.
- the film formation amount in the peripheral portion of the wafer W is compensated. That is, it is possible to prevent the film formation amount from decreasing in the peripheral portion of the wafer W. This can prevent in-plane uniformity of the film thickness of the deposited film on the wafer from being lowered. That is, the concentration of the precursor in the region above the wafer W can be made substantially uniform by the action of the auxiliary heating means 94.
- the auxiliary heating means 94 is arranged in a state in which the edge forces of Ueno and W are slightly separated. For this reason, the auxiliary heating means 94 has almost no effect of heating the peripheral portion (edge) of the wafer. That is, the auxiliary heating means 94 hardly affects the wafer W heated by the heating means 86 provided on the mounting table 26 in a state where the in-plane temperature uniformity is high. In other words, the auxiliary heating means 94 does not destroy the uniformity of the in-plane temperature of the wafer.
- the upper surface of the auxiliary heating means 94 is set to be equal to or lower than the horizontal level of the upper surface of the wafer W so that the auxiliary heating means 94 cannot be seen from the upper surface of the wafer W.
- the radiation heat to is almost completely cut off. For this reason, the thermal adverse effect of the auxiliary heating means 94 can be almost certainly eliminated.
- FIG. 6A shows the film thickness distribution when the film is formed using the conventional apparatus
- FIG. 6B shows the film thickness distribution when the film is formed using the apparatus of the present invention. In this case, both 300mm wafers were deposited.
- the film thickness on the wafer center side is substantially constant.
- the film thickness is rapidly decreasing at the periphery of the wafer. That is, the in-plane uniformity of film thickness is low.
- the film thickness has started to decrease by about 20 mm from the wafer edge, and the final film thickness reduction ratio is about 10%.
- the degree of film thickness reduction at the wafer peripheral portion is improved. It was confirmed that the final film thickness reduction ratio was suppressed to about 4%. That is, in the case of the apparatus of the present invention, it was confirmed that the in-plane uniformity of the film thickness of the deposited film formed on the upper surface of the wafer can be greatly improved.
- cleaning gas is flowed into the processing container 24 periodically or every time a predetermined number of wafers are subjected to film forming processing, thereby removing an excessive adhesion film inside the container. A cleaning process is performed.
- the protective film 106 made of yttria is formed on the entire surface of the auxiliary heating means 94, the resistance of the auxiliary heating means 94 against such plasma cleaning is increased. Particle generation (contamination amount) from can be effectively suppressed.
- Fig. 7 is a graph showing the change in the amount of contamination when a protective film made of yttria is used.
- the vertical axis represents the amount of contamination
- the horizontal axis represents the pressure in the processing vessel.
- the amount of contamination when a protective film made of alumina (A1 O) is used is also shown.
- a protective film 106 is provided not only on the surface of the auxiliary heating means 94 but also on the top plate 36. It is preferably formed on the surface of the flange head portion 66 as well.
- a plasma CVD film forming apparatus that generates plasma using microwaves is described as an example.
- the present invention is not limited to this, and the present invention introduces a plasma CVD film forming apparatus that generates plasma using a high frequency or a plasma generated outside the processing container 24 into the processing container 24. It can also be applied to the remote plasma CVD film forming apparatus.
- FIG. 8 is a schematic cross-sectional view showing a thermal CVD film forming apparatus to which the present invention is applied.
- the same components as those shown in FIG. 1 are denoted by the same reference numerals.
- auxiliary heating means 94 is provided on the periphery of the upper surface of the mounting table 26 so that the edge force of the wafer W is also slightly separated.
- the plasma forming means 40 shown in FIG. 1 is not provided.
- the shower head 66 of the gas supply means 60 is, for example, an ordinary aluminum one and is installed on the ceiling of the processing container 24. Even in such a case, the same effects as the embodiment described with reference to FIG. 1 can be obtained.
- C F is used as a film forming gas for forming the CF film.
- the seed is not limited to the CF film, and the present invention can be applied to the case where any other film type is formed.
- the object to be processed is not limited to a semiconductor wafer, and the present invention can also be applied to a glass substrate, an LCD substrate, and the like.
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JP5496630B2 (ja) | 2009-12-10 | 2014-05-21 | 東京エレクトロン株式会社 | 静電チャック装置 |
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JPH09125251A (ja) * | 1995-11-01 | 1997-05-13 | Tokyo Electron Ltd | 成膜装置 |
JP2002241946A (ja) * | 2001-02-20 | 2002-08-28 | Tokyo Electron Ltd | プラズマ処理装置 |
JP2002270598A (ja) * | 2001-03-13 | 2002-09-20 | Tokyo Electron Ltd | プラズマ処理装置 |
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JPH09125251A (ja) * | 1995-11-01 | 1997-05-13 | Tokyo Electron Ltd | 成膜装置 |
JP2002241946A (ja) * | 2001-02-20 | 2002-08-28 | Tokyo Electron Ltd | プラズマ処理装置 |
JP2002270598A (ja) * | 2001-03-13 | 2002-09-20 | Tokyo Electron Ltd | プラズマ処理装置 |
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WO2010122798A1 (ja) * | 2009-04-24 | 2010-10-28 | 国立大学法人東北大学 | 水分発生用反応炉 |
JP2010254525A (ja) * | 2009-04-24 | 2010-11-11 | Tohoku Univ | 水分発生用反応炉 |
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