WO2015151153A1 - プラズマ処理装置及びプラズマ処理方法 - Google Patents
プラズマ処理装置及びプラズマ処理方法 Download PDFInfo
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- WO2015151153A1 WO2015151153A1 PCT/JP2014/059437 JP2014059437W WO2015151153A1 WO 2015151153 A1 WO2015151153 A1 WO 2015151153A1 JP 2014059437 W JP2014059437 W JP 2014059437W WO 2015151153 A1 WO2015151153 A1 WO 2015151153A1
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- 238000009832 plasma treatment Methods 0.000 title claims abstract description 9
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
- H01J37/3211—Antennas, e.g. particular shapes of coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/3244—Gas supply means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32715—Workpiece holder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
- H01J37/32816—Pressure
- H01J37/32834—Exhausting
-
- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
Definitions
- the present invention relates to a plasma processing apparatus and a plasma processing method for supplying a predetermined processing gas into a processing chamber to generate plasma, and processing a substrate in the processing chamber with the plasma processing gas, and particularly to a substrate of 1 inch or less.
- the present invention relates to a plasma processing apparatus and a plasma processing method for performing plasma processing.
- Examples of the plasma treatment include plasma etching treatment for etching a substrate (such as a silicon substrate or a silicon carbide substrate) by ions or radicals contained in the plasma-ized treatment gas, and plasma CVD treatment for forming a thin film on the substrate.
- plasma etching treatment for etching a substrate (such as a silicon substrate or a silicon carbide substrate) by ions or radicals contained in the plasma-ized treatment gas
- plasma CVD treatment for forming a thin film on the substrate.
- Various methods have been proposed for the specific method of performing this process, and the present applicant has also proposed a method of performing a plasma etching process on a silicon carbide substrate using, for example, a plasma etching apparatus (Japanese Patent Application Laid-Open No. 2005-318867). 2013-69848).
- a processing space 102 is set in an inner lower region, and a plasma generation space 103 communicating with the processing space 102 is provided above the processing space 102.
- a cylindrical processing chamber 101 Is a cylindrical processing chamber 101, a coil 104 disposed outside a portion of the processing chamber 101 where a plasma generation space 102 is set, a base 105 disposed in the processing space 102, a coil A mechanism 106 for supplying high-frequency power to 104; a mechanism 107 for supplying a processing gas such as an etching gas or a protective film forming gas to the plasma generation space 103; a mechanism 108 for exhausting the gas in the processing chamber 101; Inductive electric field is generated by supplying high frequency power of the frequency and magnitude to the coil 104.
- plasma processing such as plasma etching processing is performed on a large-sized substrate (mainly 2 to 12 inches in diameter) so that as many semiconductor chips as possible can be obtained from one substrate. Has been trying to improve.
- the inner diameter D ′ of the processing chamber 101 corresponding to the plasma generation space 103 is set to about 100 mm to 350 mm and the frequency is 13 in order to cope with processing on a large-diameter substrate.
- a high frequency power of about .56 MHz and a size of about 1000 W is supplied to the coil 104 so that the plasma source can be used for a large-diameter substrate. Therefore, when plasma processing is performed on a small-diameter substrate using the conventional plasma etching apparatus 100, the plasma source is too large relative to the size of the substrate. Everything necessary for performing plasma processing, such as the magnitude of high-frequency power to be performed) is required.
- impedance matching of the high frequency power supplied to the coil must be performed over a wide range when adjusting the gas flow rate to adjust the plasma processing conditions. There is a problem of becoming. Further, in order to adjust the impedance matching in a wide range, a large capacitor must be used for the impedance matching device, and thus the enlargement of the impedance matching device cannot be avoided.
- the present inventors conducted extensive research for the purpose of designing a plasma source having a size suitable for a small-diameter substrate.
- the inside diameter D ′ of the processing chamber 101 was simply reduced, and the same frequency and size as in the prior art. It has been found that even when high-frequency power is supplied to the coil 104, plasma is not generated in the plasma generation space 103, or plasma is generated but is not maintained in a stable state.
- the inventors have set the frequency and magnitude of the high-frequency power supplied to the coil 104 appropriately, so that the plasma generation space can be reduced even if the inner diameter D ′ of the processing chamber 101 is reduced. It has been found that a uniform plasma can be maintained in the substrate 103, and that the substrate can be subjected to plasma treatment with the plasma-ized treatment gas.
- An object of the present invention is to provide a plasma processing apparatus and a plasma processing method capable of performing plasma processing.
- An apparatus for performing plasma treatment on a substrate having a diameter of 1 inch or less A processing chamber in which a processing space is set in a lower region and a plasma generation space communicating with the processing space is set above the processing space; An annular coil disposed outside a portion of the processing chamber corresponding to the plasma generation space; A base on which the substrate is placed, disposed in a processing space in the processing chamber; A processing gas supply mechanism for supplying a processing gas to a plasma generation space in the processing chamber; An exhaust mechanism for exhausting the gas in the processing chamber;
- a plasma processing apparatus comprising a coil power supply mechanism for supplying high frequency power to the coil,
- the inner diameter of the part of the processing chamber where the plasma generation space is set is 20 mm or more and 50 mm or less,
- the coil power supply mechanism relates to a plasma processing apparatus configured to supply high-frequency power having a frequency of 40 MHz or more and a magnitude of 2 W or more to the coil.
- the present invention also provides: A method of performing plasma treatment on a substrate having a diameter of 1 inch or less, After placing the substrate on a base disposed in a processing space set in a lower region in the processing chamber, A processing gas is supplied into a plasma generation space that is set above the processing space and communicates with the processing space in the processing chamber and has an outer diameter set to 20 mm or more and 50 mm or less. With A high frequency power having a frequency of 40 MHz or more and a size of 2 W or more is supplied to the annular coil disposed outside the processing chamber corresponding to the plasma generation space, and supplied to the plasma generation space. The treated gas is turned into plasma, The present invention relates to a plasma processing method in which plasma processing is performed on the substrate with a plasma processing gas.
- the inner diameter of the portion of the processing chamber where the plasma generation space is set is 20 mm or more and 50 mm or less, the diameter is smaller than the conventional one,
- the processing gas supplied to the plasma generation space is turned into plasma, and the substrate is subjected to plasma processing by the plasmad processing gas. That is, according to the plasma processing apparatus and the plasma processing method of the present invention, it is possible to perform plasma processing on a substrate having a diameter of 1 inch or less in a state where the plasma source is made smaller than before and the utility is reduced.
- the plasma source is made smaller than before, the change in plasma impedance when the plasma processing conditions are changed is reduced. Therefore, it is not necessary to perform impedance matching over a wide range, and the impedance matching device can be downsized.
- the frequency of the high frequency power supplied to the coil is set to 40 MHz or more, and the size is set to 2 W or more.
- the frequency is set lower than 40 MHz and the size is set lower than 2 W, This is based on the knowledge that plasma is not generated in the plasma generation space, or even if generated, it is not maintained in a stable state.
- the high frequency power supplied to the coil by the coil power supply mechanism has a frequency of 100 MHz or less and a size of 50 W or less.
- the gap between the outer surface of the portion corresponding to the plasma generation space and the coil is 0.5 mm or more and 5 mm or less. It is preferable to provide a gap.
- the flow rate of the processing gas is preferably 0.1 sccm or more and 20 sccm or less, and more preferably 1 sccm or more and 20 sccm or less.
- the pressure in the processing chamber is set to 0.1 Pa to 30 Pa. It is preferable to set it to 3 Pa or more and 30 Pa or less.
- the number of turns of the coil is preferably 1 or more and 5 or less. This is because, when the number of turns is less than 1, the voltage and the high-frequency fluctuating magnetic field act on a part of the processing gas supplied in the plasma generation space, and the plasma generated in the plasma generation space is not uniform. This is because if the number of turns is greater than 5, the impedance of the coil increases and the inductive coupling component due to current decreases, making it difficult to maintain the plasma in the plasma generation space.
- the number of turns of the coil is more preferably 1 or more and 3 or less.
- substrate in the present application, a substrate made of silicon, silicon carbide, sapphire, compound semiconductor, glass, resin, or the like can be exemplified.
- plasma processing is performed on a substrate having a diameter of 1 inch or less in a state in which a plasma source corresponding to the substrate is configured and power is reduced. Can do.
- the plasma processing apparatus of this example is a plasma etching apparatus, and performs a plasma etching process on a substrate having a diameter of 1 inch or less.
- the plasma etching apparatus 1 of this example has a cylindrical processing chamber in which a processing space 3 is set below an internal space and a plasma generation space 4 is set above the processing space 3. 2, a processing gas supply mechanism 15 for supplying a processing gas to the plasma generation space 4, a coil 20 disposed outside the portion of the processing chamber 2 where the plasma generation space 4 is set, and the coil 20
- a base power supply mechanism for supplying high-frequency power to the base 30 40 and an exhaust device 45 for exhausting the gas in the processing chamber 2.
- the processing chamber 2 is composed of a lower body portion 5, an upper body portion 6, a bottom plate 7, an intermediate plate 8, a top plate 9, and a support column 10, and the lower body portion 5 has a bottom plate 7 fixed to a lower end portion thereof.
- an intermediate plate 8 is fixed to the upper end, and the processing space 3 is formed by the lower body portion 5, the bottom plate 7 and the intermediate plate 8.
- the upper body 6 has a lower end fixed to the upper surface of the intermediate plate 8 and a top 9 fixed to the upper end.
- the upper body 6, the intermediate plate 8, and the top 9 make plasma.
- a generation space 4 is formed. Note that an opening 8a is formed in the intermediate plate 8, and the processing space 3 and the plasma generation space 4 communicate with each other through the opening 8a.
- a plurality of support columns 10 are provided between the intermediate plate 8 and the top plate 9.
- the upper body portion 6 is made of quartz, and has an inner diameter D (in other words, an outer diameter of the plasma generation space) that is 20 mm or more and 50 mm or less, which is a size corresponding to the substrate K having a diameter of 1 inch or less. ing.
- the lower body 5 is formed with an exhaust port 5a for exhausting the gas in the processing space 3, and the exhaust device 45 is connected to the exhaust port 5a. The gas in 2 is exhausted.
- the processing gas supply mechanism 15 includes an etching gas supply unit 16 that supplies an etching gas such as SF 6 gas, a protective film formation gas supply unit 17 that supplies a protective film formation gas such as C 4 F 8 gas, and one end thereof.
- a supply pipe 19 connected to a plurality of discharge ports provided in an annular shape on the lower surface of the top plate 9 and having the other end branched and connected to the etching gas supply unit 16 and the protective film forming gas supply unit 17, respectively.
- each gas is supplied into the plasma generation space 4 from the supply units 16 and 17 via the supply pipe 19.
- the etching gas is not limited to SF 6 gas, and other fluorine-based gases such as CF 4 , C 3 F 8 , C 4 F 8 , SiF 4 , NF 3 , and IF 5 are used. Can do.
- the protective film forming gas is not limited to C 4 F 8 gas, and other perfluorocarbon gas such as C 5 F 8 or hydrofluorocarbon gas such as CHF 3 or CH 2 F 2 may be used. it can.
- the coil 20 is disposed so as to be wound around the outer side of the upper body part 6 with a gap S between the coil 20 and the outer peripheral surface of the upper body part 6. High frequency power is supplied by the supply mechanism 25.
- the coil 20 is supported by a plurality of support members 21 attached to the upper surface of the intermediate plate 8 so as to be positioned approximately in the middle of the upper trunk portion 6.
- the number of turns of the coil 20 is preferably 1 or more and 3 or less.
- the gap S is preferably set to 0.5 mm or more and 5 mm or less.
- the coil power supply mechanism 25 includes an impedance matching unit 26 connected to the coil 20 and a high-frequency power source 27 connected to the impedance matching unit 26, and supplies high-frequency power to the coil 20 as described above. Mechanism.
- the base 30 is composed of an upper member 31 on which the substrate K is placed and a lower member 32 to which an elevating cylinder 33 is connected.
- the base 30 is supported by the support base 34 so as to be able to advance and retract in the vertical direction. It is disposed in the space 3 and is moved up and down by the lift cylinder 32.
- a space between the outer peripheral edge of the lower surface of the lower member 32 and the upper surface of the support base 33 is covered with a bellows 35 so that the airtightness of the processing space 3 is ensured.
- the base power supply mechanism 40 includes an impedance matching unit 41 connected to the base 30 and a high frequency power source 42 connected to the impedance matching unit 41, and supplies a high frequency power to the base 30. It is.
- the exhaust device 45 includes a vacuum pump 46 that exhausts gas, and an exhaust pipe 47 that has one end connected to the vacuum pump 46 and the other end connected to the exhaust port 5 a of the lower body 5. Evacuates the gas in the processing chamber 2 by the vacuum pump 46 through the exhaust pipe 47 and maintains the inside of the processing chamber 2 at a predetermined pressure.
- a substrate K having a mask with a predetermined pattern formed thereon is placed on the base 30 at the lowered position, and then the base 30 is moved up to the processing position by the lifting cylinder 33 and then processed by the exhaust device 45.
- the gas in the chamber 2 (the processing space 3 and the plasma generation space 4) is evacuated to make the processing chamber 2 have a negative pressure.
- an etching process is performed. Specifically, the etching gas is supplied from the etching gas supply unit 16 into the plasma generation space 4 and high-frequency power having a frequency of 40 MHz or more and a size of 2 W or more is supplied to the coil 20 by the coil power supply mechanism 25. Then, an induction electric field is generated in the plasma generation space 4, and the gas in the processing chamber 2 is exhausted by the exhaust device 45 so that the pressure in the processing chamber 2 becomes 0.1 Pa or more and 30 Pa or less. Thereby, the etching gas supplied into the plasma generation space 4 is turned into plasma. Thereafter, the base power supply mechanism 40 supplies high frequency power to the base 30.
- the high frequency power supplied to the coil 20 is more preferably 100 MHz or less and the magnitude is 50 W or less, and the etching gas supply flow rate is preferably 0.1 sccm or more and 20 sccm or less.
- the etching gas converted into plasma in the plasma generation space 4 as described above descends to the processing space 3 through the opening 8a of the intermediate plate 8 and reaches the substrate K.
- the surface of the substrate K is etched, and an etching structure is formed on the surface of the substrate K.
- ions in the plasma are irradiated toward the substrate K, so-called ion-assisted etching is performed. Is called.
- a protective film forming step is performed. Specifically, the protective film forming gas is supplied from the protective film forming gas supply unit 17 into the plasma generation space 4, and the coil power supply mechanism 25 coils high frequency power having a frequency of 40 MHz or more and a size of 2 W or more. 20, and the gas in the processing chamber 2 is exhausted by the exhaust device 45 so that the pressure in the processing chamber 2 is 0.1 Pa or more and 30 Pa or less. Thereby, the protective film forming gas in the plasma generation space 4 is turned into plasma.
- the high frequency power supplied to the coil 20 is more preferably set to a frequency of 100 MHz or less and a size of 50 W or less, and the supply flow rate of the protective film forming gas is 0.1 sccm. It is preferable to be 20 sccm or less.
- the plasma-forming protective film forming gas reaches the surface of the substrate K, and a protective film is formed on the inner wall of the etching structure formed in the etching process.
- the etching process is performed again, and etching proceeds in the depth direction while removing the protective film at the bottom of the etching structure by ions in the plasma.
- an etching structure having a predetermined depth is formed on the surface of the substrate K by sequentially repeating the etching process and the protective film forming process.
- the processing conditions differ between the etching process and the protective film forming process, but since the plasma source is made smaller than before, the change in plasma impedance is small, and the processing conditions are changed.
- Each step can be performed without performing impedance matching in a wide range, and the impedance matching unit 26 can be downsized.
- the processing power for the etching process and the protective film forming process is reduced as compared with the conventional technique, and each process is performed on the substrate having a diameter of 1 inch or less so-called.
- An etching structure can be formed by a switching process.
- the present inventors used a plasma etching apparatus in which the inner diameter of the upper body portion is 50 mm, the inner diameter of the coil is 60 mm, and the number of turns of the coil is 1, and Ar gas is used as the processing gas, A test in which the pressure is 5 Pa, the flow rate of Ar gas is 3 sccm, the magnitude of the high-frequency power supplied to the coil is fixed to 50 W, the frequency of the high-frequency power supplied to the coil is changed, and the plasma state at each frequency is confirmed. Went.
- FIG. 2 is a table summarizing the results.
- a 13.56 MHz high-frequency power that is normally used is used. It can be seen that a good plasma cannot be generated even if it is supplied, and in order to generate a good plasma and maintain it stably, it is necessary to supply a high frequency power of an appropriate frequency.
- the reason why a good plasma can be obtained by supplying high frequency power of 40 MHz or more when the inner diameter of the upper body portion is reduced is considered to be as follows.
- a so-called skin layer near the inner wall of the processing chamber in the plasma generation space is a region where plasma is not generated by the skin effect when high-frequency power is supplied to the coil, and the skin layer has a radial thickness as the frequency of the high-frequency power increases. On the contrary, the thickness increases as the frequency of the high-frequency power decreases. Therefore, when high-frequency power smaller than 40 MHz is supplied, the skin layer becomes too thick, and a region where plasma is generated is not sufficiently ensured, so that good plasma cannot be generated. However, it is considered that when high frequency power of 40 MHz or higher was supplied, the skin layer was sufficiently thin and a region where plasma was generated was secured.
- the present inventors confirmed that the frequency of the high frequency power supplied to the coil is 100 MHz and the pressure in the processing chamber is 5 Pa in order to confirm the minimum value of the high frequency power capable of maintaining stable plasma.
- the flow rate of the processing gas was 3 sccm, and the magnitude of the high-frequency power at which plasma was maintained under various conditions was measured by changing the inner diameter of the upper body, the inner diameter of the coil, the number of turns of the coil, and the type of the processing gas. .
- the minimum value of the high-frequency power for maintaining the plasma was 2 W. 3 is a table summarizing the measurement results.
- (A) shows the case where the inner diameter of the upper body is 20 mm, the inner diameter of the coil is 30 mm, and the number of turns of the coil is 1.
- (c) is when the inner diameter of the upper body is 30 mm, the inner diameter of the coil is 36 mm, and the number of turns of the coil is 1.
- 6 is a table summarizing the magnitude of high-frequency power necessary for maintaining plasma (discharge maintenance lower limit high-frequency power) for each processing gas in FIG.
- sufficient energy for dissociating the plasma cannot be obtained when the high-frequency power is small, but by increasing the frequency, sufficient energy for dissociating the plasma in the plasma generation space can be obtained even when the high-frequency power is small. Can give energy.
- the present inventors used a plasma etching apparatus in which the inner diameter of the upper body portion is 50 mm, the inner diameter of the coil is 60 mm, and the number of turns of the coil is 1 in order to examine the change in the etching rate under different conditions.
- the magnitude of the high frequency power supplied to the coil is fixed to 50 W
- the flow rate of SF 6 gas is fixed to 3 sccm
- the pressure in the processing chamber is supplied to the coil at 5 to 10 Pa.
- the frequency of the high frequency power was changed from 40.68 to 100 MHz, and the etching rate of the silicon substrate in each case was measured.
- FIG. 4 is a table summarizing the results.
- the etching rate tends to increase by lowering the pressure.
- the etching rate is highest when the frequency is 80 MHz.
- the present inventors have an inner diameter of the upper trunk portion of 30 mm, an inner diameter of the coil of 36 mm, Using a plasma etching apparatus in which the number of turns of the coil is 1, the type of processing gas, the magnitude of the high-frequency power supplied to the coil, and the flow rate of the processing gas are fixed to the same conditions as in FIG. As a result of changing the frequency of the high frequency power supplied to the coil and measuring the plasma density in the processing chamber in each case using a plasma absorption probe, the plasma density required for etching can be confirmed. It was.
- FIG. 5 is a table summarizing the plasma density measurement results.
- the results shown in FIG. 5 indicate that the pressure in the processing chamber is 3 to 10 Pa and the frequency of the high frequency power supplied to the coil is 40.68 to 100 MHz. It is the result of the measurement performed by changing.
- FIG. 6 is a table summarizing the measurement results of the etching rate. The results shown in FIG. 6 are obtained by changing the pressure in the processing chamber to 5 to 10 Pa and the frequency of the high frequency power supplied to the coil to 80 to 100 MHz. It is the result of the measurement performed.
- the etching rate is lower when the inner diameter of the upper body portion is smaller, but the pressure increases when the inner diameter of the upper body portion is reduced. This is presumably because the reaction becomes saturated and the tendency of the etching rate to decrease is intensified.
- 7 and 8 are tables summarizing the results of measurements performed using a plasma etching apparatus in which the inner diameter of the upper body is 50 mm, the inner diameter of the coil is 60 mm, and the number of turns of the coil is 1.
- the pressure in the processing chamber is 5 Pa
- the magnitude of the high-frequency power supplied to the coil is 50 W
- the Ar gas flow rate is fixed to 3 sccm
- the frequency of the high-frequency power supplied to the coil is changed from 40.68 to 100 MHz.
- FIG. 8 shows that the frequency of the high frequency power supplied to the coil is 40.68 MHz, the size is 50 W, the Ar gas flow rate is fixed to 3 sccm, and the pressure in the processing chamber is This was performed by changing the pressure from 3 to 12 Pa.
- FIG. 9 shows a plasma etching apparatus in which the inner diameter of the upper body portion is 30 mm, the inner diameter of the coil is 36 mm, and the number of turns of the coil is 1, and the frequency of the high-frequency power supplied to the coil is 40.68 MHz.
- 10 is a table summarizing the results of measurements performed by fixing the flow rate of 50 W and Ar gas at 3 sccm and changing the pressure in the processing chamber from 5 to 10 Pa.
- FIG. 10 shows a high-frequency power that uses a plasma etching apparatus in which the inner diameter of the upper body portion is 20 mm, the inner diameter of the coil is 30 mm, and the number of turns of the coil is 2 or 3, and the pressure in the processing chamber is 5 Pa.
- 4 is a table summarizing the results of measurements performed while fixing the frequency of 100 MHz and the size to 50 W and changing the gas flow rate to 1.5 to 3 sccm.
- FIG. 10 shows a high-frequency power that uses a plasma etching apparatus in which the inner diameter of the upper body portion is 20 mm, the inner diameter of the coil is 30 mm, and the number of turns of the coil is 2 or 3, and the pressure in the processing chamber is 5 Pa.
- 4 is a table summarizing the results of measurements performed while fixing the frequency of 100 MHz and the size to 50 W and changing the gas flow rate to 1.5 to 3 sccm.
- 11 uses a plasma etching apparatus in which the inner diameter of the upper body portion is 20 mm, the inner diameter of the coil is 30 mm, and the number of turns of the coil is 2, and the frequency of the high-frequency power supplied to the coil is fixed to 100 MHz.
- 6 is a table summarizing the results of measurements performed by changing the pressure in the processing chamber to 5 to 10 Pa, the gas flow rate to 1 to 3 sccm, and the magnitude of the high-frequency power supplied to the coil to 10 to 50 W.
- the inventors measured the etching rate and the deposition rate for the silicon substrate. Specifically, the measurement of the etching rate uses SF 6 gas as the processing gas, the gas flow rate is 3 sccm, the pressure in the processing chamber is 5 Pa, the frequency of the high frequency power supplied to the coil is 100 MHz, the size is 50 W, The bias power is fixed at 2 W, and the deposition rate is measured using C 4 F 8 gas as the processing gas, the gas flow rate is 1.5 sccm, the frequency of the high frequency power supplied to the coil is 100 MHz, and the magnitude is The inner diameter of the upper body was changed from 20 to 30 mm, the inner diameter of the coil was changed from 30 to 36 mm, and the number of turns of the coil was changed to 2 or 3.
- FIG. 12 is a table summarizing the results.
- the silicon substrate can be etched at a predetermined rate, and similarly, the protective film can be formed at a predetermined rate. is made of.
- the etching rate and the deposition rate are increased by increasing the number of turns of the coil. This is because by increasing the number of turns of the coil, the voltage applied to the coil increases, the area acting on the processing gas in the plasma generation space and the capacitive coupling component increase, the dissociation of the plasma is promoted, and the rate is increased. This is thought to increase.
- the present inventors have used a plasma etching apparatus in which the inner diameter of the upper body portion is 30 mm, the inner diameter of the coil is 36 mm, and the number of turns of the coil is 1, and a mask having an opening width of 3 ⁇ m is formed.
- the etching process and the protective film forming process were sequentially repeated on the corner silicon substrate, an etching structure having a depth of 13.8 ⁇ m was formed as shown in FIG. It was revealed that practical etching treatment can be performed.
- SF 6 gas is used as the etching gas
- the pressure is 5 Pa
- the gas flow rate is 3 sccm
- the frequency of the high frequency power supplied to the coil is 100 MHz
- the magnitude is 50 W
- the bias power is 3 W.
- the protective film forming step is performed using C 4 F 8 gas as a protective film forming gas, pressure of 5 Pa, gas flow rate of 3 sccm, frequency of high frequency power supplied to the coil of 100 MHz, and size of 50 W. It was.
- the present inventors fixed the frequency of the high frequency power supplied to the coil to 100 MHz in the plasma etching apparatus in which the inner diameter of the upper body portion is 20 mm, the inner diameter of the coil is 30 mm, and the number of turns of the coil is 1,
- the pressure in the processing chamber is changed to 3 to 10 Pa
- the flow rate of the processing gas is changed to 1.5 to 5 sccm
- the magnitude of the high-frequency power supplied to the coil is changed to 20 to 50 W.
- the magnitude of the traveling wave and the reflected wave when high frequency power was supplied to the coil was measured.
- Each table in FIG. 14 is a table summarizing the measurement results.
- (A) shows the case where SF 6 gas is used as the processing gas
- (b) shows the case where C 4 F 8 gas is used as the processing gas
- ( c) summarizes the results when O 2 gas is used as the processing gas.
- the numerator is a traveling wave (W)
- the denominator is a reflected wave (W).
- the process of forming the etching structure by the switching process using the plasma etching apparatus 1 has been described, but this is only an example, and the plasma etching apparatus 1 can be used for all kinds of etching processes.
- the plasma processing apparatus is embodied as a plasma etching apparatus.
- the present invention is not limited to this.
- a plasma CVD apparatus used when forming a thin film on a substrate is used.
- it may be embodied as a plasma ashing device used when removing the resist.
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Abstract
Description
直径1インチ以下の基板にプラズマ処理を施す装置であって、
下部領域に処理空間が設定され、該処理空間の上方に該処理空間と連通したプラズマ生成空間が設定された処理チャンバと、
前記処理チャンバの、前記プラズマ生成空間に対応する部分の外方に配設された環状のコイルと、
前記処理チャンバ内の処理空間に配設され、前記基板を載置する基台と、
前記処理チャンバ内のプラズマ生成空間に処理ガスを供給する処理ガス供給機構と、
前記処理チャンバ内の気体を排気する排気機構と、
前記コイルに高周波電力を供給するコイル電力供給機構とを備えたプラズマ処理装置において、
前記処理チャンバの、プラズマ生成空間が設定された部分の内径は、20mm以上50mm以下であり、
前記コイル電力供給機構は、周波数が40MHz以上であり、且つ大きさが2W以上の高周波電力を前記コイルに供給するように構成されているプラズマ処理装置に係る。
直径1インチ以下の基板にプラズマ処理を施す方法であって、
処理チャンバ内の下部領域に設定された処理空間内に配設される基台上に前記基板を載置した後、
前記処理チャンバ内の、前記処理空間の上方に設定される、該処理空間と連通したプラズマ生成空間であって、外径が20mm以上50mm以下に設定されたプラズマ生成空間内に処理ガスを供給するとともに、
該プラズマ生成空間に対応する前記処理チャンバの外方に配設された環状のコイルに、周波数が40MHz以上であり、且つ大きさが2W以上の高周波電力を供給して、前記プラズマ生成空間に供給された処理ガスをプラズマ化し、
プラズマ化された処理ガスによって、前記基板にプラズマ処理を施すようにしたプラズマ処理方法に係る。
2 処理チャンバ
3 処理空間
4 プラズマ生成空間
5 下胴部
6 上胴部
15 処理ガス供給機構
20 コイル
25 コイル電力供給機構
30 基台
40 基台電力供給機構
45 排気装置
Claims (12)
- 直径1インチ以下の基板にプラズマ処理を施す装置であって、
下部領域に処理空間が設定され、該処理空間の上方に該処理空間と連通したプラズマ生成空間が設定された処理チャンバと、
前記処理チャンバの、前記プラズマ生成空間に対応する部分の外方に配設された環状のコイルと、
前記処理チャンバ内の処理空間に配設され、前記基板を載置する基台と、
前記処理チャンバ内のプラズマ生成空間に処理ガスを供給する処理ガス供給機構と、
前記処理チャンバ内の気体を排気する排気機構と、
前記コイルに高周波電力を供給するコイル電力供給機構とを備えたプラズマ処理装置において、
前記処理チャンバの、プラズマ生成空間が設定された部分の内径は、20mm以上50mm以下であり、
前記コイル電力供給機構は、周波数が40MHz以上であり、且つ大きさが2W以上の高周波電力を前記コイルに供給するように構成されていること特徴とするプラズマ処理装置。 - 前記コイル電力供給機構は、周波数が100MHz以下であり、且つ大きさが50W以下の高周波電力を前記コイルに供給するように構成されていることを特徴とする請求項1記載のプラズマ処理装置。
- 前記処理チャンバの、プラズマ生成空間に対応する部分の外面と、前記コイルとの間に、0.5mm以上5mm以下の隙間を設けたことを特徴とする請求項1又は2記載のプラズマ処理装置。
- 前記処理ガス供給機構は、0.1sccm以上20sccm以下の流量でプラズマ生成空間内に処理ガスを供給するように構成されていることを特徴とする請求項1乃至3記載のいずれかのプラズマ処理装置。
- 前記処理チャンバ内の圧力は、0.1Pa以上30Pa以下に設定されることを特徴とする請求項1乃至4記載のいずれかのプラズマ処理装置。
- 前記コイルの巻き数は、1以上5以下であることを特徴とする請求項1乃至5記載のいずれかのプラズマ処理装置。
- 直径1インチ以下の基板にプラズマ処理を施す方法であって、
処理チャンバ内の下部領域に設定された処理空間内に配設される基台上に前記基板を載置した後、
前記処理チャンバ内の、前記処理空間の上方に設定される、該処理空間と連通したプラズマ生成空間であって、外径が20mm以上50mm以下に設定されたプラズマ生成空間内に処理ガスを供給するとともに、
該プラズマ生成空間に対応する前記処理チャンバの外方に配設された環状のコイルに、周波数が40MHz以上であり、且つ大きさが2W以上の高周波電力を供給して、前記プラズマ生成空間に供給された処理ガスをプラズマ化し、
プラズマ化された処理ガスによって、前記基板にプラズマ処理を施すようにしたことを特徴とするプラズマ処理方法。 - 周波数が100MHz以下であり、且つ大きさが50W以下の高周波電力を前記コイルに供給するようにしたことを特徴とする請求項7記載のプラズマ処理方法。
- 前記処理チャンバの、プラズマ生成空間が設定された部分の外周面と、前記コイルとの間には、0.5mm以上5mm以下の隙間が設けられていることを特徴とする請求項7又は8記載のプラズマ処理方法。
- 0.1sccm以上20sccm以下の流量で前記プラズマ生成空間に処理ガスを供給するようにしたことを特徴とする請求項7乃至9記載のいずれかのプラズマ処理装置。
- 前記処理チャンバ内の圧力を、0.1Pa以上30Pa以下に設定するようにしたことを特徴とする請求項7乃至10記載のいずれかのプラズマ処理方法。
- 前記コイルは、その巻き数が1以上5以下であることを特徴とする請求項7乃至11記載のいずれかのプラズマ処理方法。
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