WO2004082009A1 - Cvd装置のクリーニング装置およびcvd装置のクリーニング方法 - Google Patents
Cvd装置のクリーニング装置およびcvd装置のクリーニング方法 Download PDFInfo
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- WO2004082009A1 WO2004082009A1 PCT/JP2004/003269 JP2004003269W WO2004082009A1 WO 2004082009 A1 WO2004082009 A1 WO 2004082009A1 JP 2004003269 W JP2004003269 W JP 2004003269W WO 2004082009 A1 WO2004082009 A1 WO 2004082009A1
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- cleaning
- reaction chamber
- gas
- reaction
- intensity
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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
- C23C16/52—Controlling or regulating the coating process
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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
- C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
- C23C16/4405—Cleaning of reactor or parts inside the reactor by using reactive gases
Definitions
- the present invention Kuriyungu apparatus and a CVD apparatus of the CVD apparatus, a uniform on the surface of the semiconductor base material such as a silicon wafer quality oxidation silicon (S i 0 2), silicon nitride (S i 3 N 4 ) Chemical vapor deposition (CVD) equipment for forming thin films.
- the semiconductor base material such as a silicon wafer quality oxidation silicon (S i 0 2), silicon nitride (S i 3 N 4 ) Chemical vapor deposition (CVD) equipment for forming thin films.
- a CVD device cleaning device capable of performing cleaning for removing by-products attached to the inner wall of the reaction chamber after the thin film formation process, and a CVD device using the same. Cleaning method.
- a silicon oxide (S i 0 2), a thin film such as ⁇ I ⁇ silicon (such as S i 3 N 4), the semiconductor elements such as thin film transistors, are widely used, such as a photoelectric conversion element.
- the following three types are mainly used for forming such thin films of silicon oxide and silicon nitride.
- a method of forming a thin film by converting a solid thin film material into atoms or atomic groups which are physical methods, and depositing it on the surface on which a film is to be formed
- the plasma enhanced chemical vapor deposition method of (3) has been widely used because a dense and uniform thin film can be efficiently formed (Japanese Patent Application Laid-Open No. 9-169504, Published Japanese Patent Application No. 2001-28362).
- the plasma CVD apparatus 100 used for this plasma CVD method is generally configured as shown in FIG.
- the plasma CVD apparatus 100 includes a reaction chamber 102 maintained at a reduced pressure, and an upper electrode 104 and a lower electrode 106 are arranged in the reaction chamber 102 so as to face each other with a certain distance therebetween.
- the upper electrode 104 is connected to a film forming gas supply path 108 connected to a film forming gas source (not shown), and the film forming gas is supplied into the reaction chamber 102 through the upper electrode 104. It is configured to supply to.
- a high frequency applying device 110 for applying a high frequency is connected to the reaction chamber 102 near the upper electrode 104. Further, an exhaust path 114 for exhausting exhaust gas through a pump 112 is connected to the reaction chamber 102.
- plasma CVD device 1 00 for example, when forming the oxide silicon (S i 0 2) is monosilane (S i H 4), N 2 0, N 2, 0 2, When silicon nitride (such as Si 3 N 4 ) is deposited on Ar or the like, monosilane (S i H 4 ), NH 3 , N 2 , O 2 , Ar, etc. are supplied to the reaction chamber maintained at a reduced pressure of, for example, 130 Pa via the film forming gas supply path 108 and the upper electrode 104. Introduced within 102.
- a high-frequency electric power of, for example, 13.56 MHz is applied between the electrodes 104 and 106 disposed opposite to each other in the reaction chamber 102 via the high-frequency application device 110 to generate a high-frequency electric field. generate. Then, electrons collide with neutral molecules of the film-forming gas in the electric field to form high-frequency plasma, and the film-forming gas is decomposed into ions and radicals.
- a silicon thin film is formed on the surface of a semiconductor product W such as a silicon wafer provided on the lower electrode 106 which is one of the electrodes.
- the discharge in the reaction chamber 102 causes the inner wall of the reaction chamber 102 other than the semiconductor product W to be formed into a film, the surface of the electrodes, etc. also, a thin film material such as S i 0 2, S i 3 N 4 is deposited, the deposited by-products are formed.
- this by-product grows to a certain thickness, it peels off due to its own weight or stress, and during the film forming process, as foreign matter, it causes fine particles to be mixed into semiconductor products and causes contamination.
- the thin film could not be manufactured, causing disconnection or short circuit of the semiconductor circuit, and the yield might be reduced.
- a gas containing a fluorine-containing compound such as CF 4 , C 2 F 6 , or COF 2 is accompanied by a gas such as ⁇ 2 or Z or Ar to supply a film forming gas.
- the reaction gas is introduced into the reaction chamber 102 maintained at a reduced pressure via the path 108 and the upper electrode 104.
- high-frequency power is applied between the electrodes 104 and 106 disposed opposite to each other in the reaction chamber 102 through the high-frequency application device 110 to obtain high-frequency power.
- An electric field is generated, and electrons collide with neutral molecules of the cleaning gas in the electric field to form a high-frequency plasma, and the cleaning gas is decomposed into ions and radicals.
- the reaction chamber one 1 0 2 of the inner wall, attached to a surface such as an electrode, the deposited reacts with S i 0 2, by-products such as S i 3 N 4, as S i F 4
- the exhaust gas is discharged to the outside of the reaction chamber 102 together with the exhaust gas by the pump 112 via the exhaust path 114.
- the period of the cleaning is too short, the reaction Champa one 1 0 2 of the inner wall, attached to a surface such as an electrode, by-products such as S I_ ⁇ 2, S i 3N4 which deposited becomes Rukoto be remaining, repeated If a CVD device is used, as described above, it may cause contamination and contamination of semiconductor products with fine particles, making it impossible to manufacture high-quality thin films, causing disconnection and short-circuiting of semiconductor circuits, and Yield will also decrease. Conversely, if the cleaning time is too long, the cleaning gas introduced into the reaction chamber 102 will be discharged as it is without contributing to cleaning. For this reason, there is a fear that a harmful effect on the environment may be caused by releasing a cleaning gas composed of a fluorine-containing compound such as CF 4 and C 2 F 6 into the atmosphere.
- a fluorine-containing compound such as CF 4 and C 2 F 6
- fluorine-containing compounds such as CF 4 and C 2 F 6 used as a cleaning gas are stable compounds having a long life in the air, and it is difficult to treat exhaust gas after cleaning, and the treatment cost is low. There was a problem that it was expensive.
- global warming potential integrated period 100-year value
- CF4 is 6500
- C 2 F 6 is 92 00
- SF 6 is very large as 23900, a large impact on global warming.
- the cleaning time is prolonged, the throughput is reduced and productivity is impaired.
- the present invention is, in view of such circumstances, the reaction chamber one inner wall during the film forming process, adhere to the surface such as an electrode, the S i 0 2, by-products such as S i 3 N4 which deposited, Cleaning that can be removed efficiently and that emits extremely low amounts of cleaning gas, has little impact on the environment such as global warming, has good gas use efficiency, and can improve productivity
- An object of the present invention is to provide a cleaning apparatus for a CVD apparatus which can perform the cleaning, and a method for cleaning a CVD apparatus using the same.
- the present invention has been made in order to achieve the above-mentioned problems and objects in the prior art, and a cleaning apparatus for a CVD apparatus according to the present invention
- a reaction gas introduction device for applying high frequency to the reaction gas supplied into the reaction chamber via the gas supply path to generate plasma and supplying the plasma-converted reaction gas into the reaction chamber;
- a counter electrode stage on which a substrate for forming a deposited film is placed and
- a cleaning device for a CVD device wherein a deposited film is formed on a surface of a substrate on the counter electrode stage by a plasma-converted reaction gas introduced into a reaction chamber via the reaction gas introduction device,
- OES emission spectrometer
- a cleaning control device configured to perform the cleaning.
- the cleaning method of the CVD apparatus of the present invention is characterized in that the reaction gas supplied into the reaction chamber via the reaction gas supply path is applied with a high frequency to be converted into plasma, and the reaction gas converted into plasma is supplied to the reaction chamber.
- a reaction gas introduction device for supplying A counter electrode stage disposed on the substrate for forming a deposited film;
- a method for cleaning a CVD device wherein a deposited film is formed on a substrate surface on the counter electrode stage by a plasma-converted reaction gas introduced into a reaction chamber via the reaction gas introduction device,
- the emission spectrometer (OES) attached to the reaction chamber performs the emission spectroscopy analysis of the F radicals in the reaction chamber to measure the emission intensity, and the mass analyzer analyzes the F intensity in the reaction chamber. Measure, or both,
- emission spectroscopy using an emission spectrometer (OES) and / or measurement of F intensity using a mass spectrometer can be used to determine the radial emission intensity saturation point or F intensity saturation point of a radical in the reaction chamber.
- OES emission spectrometer
- F intensity saturation point F intensity saturation point
- the cleaning time is not too short, and S i ⁇ 2 , S i 3 N 4 etc. adhered and accumulated on the wall of the reaction chamber, the surface of the electrodes, etc., and the piping of the gas discharge path. By-products do not remain, and by-products can be completely removed.
- the cleaning time is not too long, and the cleaning gas introduced into the reaction chamber does not contribute to cleaning and is not discharged as it is.
- the cleaning gas composed of a fluorine-containing compound such as CF 4 or C 2 F 6 is not released into the atmosphere, and there is no possibility that the cleaning gas has an adverse effect on the environment such as global warming.
- the emission intensity of F radicals by the emission spectrometer (OES) and the F intensity by the mass spectrometer are proportional to the etching rate of by-products (cleaning rate), cleaning is performed for a predetermined time with high cleaning efficiency. Since cleaning is maintained, cleaning efficiency is improved.
- the cleaning apparatus of the CVD apparatus of the present invention applies high frequency to the reaction gas supplied into the reaction chamber via the reaction gas supply path to generate plasma.
- a counter electrode stage that is disposed in the reaction chamber and on which a base material that forms a deposited film is placed;
- a cleaning apparatus for a CVD apparatus wherein a deposited film is formed on a surface of a base material on the counter electrode stage by a plasma-converted reaction gas introduced into a reaction chamber via the reaction gas introduction apparatus.
- An infrared absorption analyzer (FTIR) for analyzing an exhaust gas component is disposed in a gas discharge path for discharging the exhaust gas from the reaction chamber 1,
- a cleaning control device configured to control the cleaning to be completed when the cleaning is performed.
- the cleaning method of the CVD apparatus of the present invention includes the steps of: applying a high frequency to a reaction gas supplied into the reaction chamber via a reaction gas supply path to generate plasma; A reaction gas introduction device for supplying the inside
- a counter electrode stage disposed in the reaction chamber and on which a substrate for forming a deposited film is disposed;
- a deposited film is formed on the surface of the substrate on the counter electrode stage by the plasma-converted reaction gas introduced into the reaction chamber through the reaction gas introduction device.
- Exhaust gas components are analyzed by an infrared absorption analyzer (FTIR) arranged in a gas discharge path for discharging exhaust gas from the reaction chamber,
- FTIR infrared absorption analyzer
- the infrared absorption analyzer by monitoring the density data of S i F 4 in the exhaust gas from the reaction chamber one, as compared with the previously stored S i F 4 density data, it reaches a predetermined cleaning end point concentration It is a special feature that cleaning is completed when the cleaning is completed.
- the cleaning By monitoring the concentration data of SiF 4 in the exhaust gas from the reaction chamber by the infrared absorption analyzer arranged in the gas discharge path, when the concentration reaches the predetermined cleaning end point concentration, The cleaning is finished.
- concentration data of SiF 4 in the exhaust gas from the reaction chamber by the infrared absorption analyzer arranged in the gas discharge path, when the concentration reaches the predetermined cleaning end point concentration, The cleaning is finished.
- the cleaning can be completed at the time when the cleaning is completed accurately.
- the cleaning time is not too short, and by-products such as Sio 2 and Si 3 N 4 that adhere to or accumulate on the inner wall of the reaction chamber, the surfaces of the electrodes, etc., and the piping of the gas exhaust path, etc. By-products can be completely removed without remaining.
- the cleaning time is not too long, and the cleaning gas introduced into the reaction chamber does not contribute to cleaning and is not discharged as it is.
- the cleaning gas composed of fluorine-containing compounds such as CF 4 and C 2 F 6 is not released into the atmosphere, which may adversely affect the environment such as global warming.
- the cleaning apparatus for a CVD apparatus of the present invention is characterized in that the reaction gas supplied into the reaction chamber 1 through the reaction gas supply path is applied with a high frequency to be turned into plasma, and the reaction gas that has been turned into plasma is supplied to the reaction chamber 1.
- a counter electrode stage that is disposed in the reaction chamber and on which a base material that forms a deposited film is placed;
- a cleaning device for a CVD device wherein a deposited film is formed on a surface of a base material on the counter electrode stage by a plasma-formed reaction gas introduced into a reaction chamber through the reaction gas introduction device,
- An emission spectrometer for measuring emission intensity by performing emission spectroscopy analysis of F radicals in the reaction chamber and / or a mass analyzer for measuring F intensity is attached to the reaction chamber.
- An infrared absorption analyzer (FTIR) for analyzing an exhaust gas component is disposed in a gas discharge path for discharging the exhaust gas from the reaction chamber,
- a cleaning control device configured to determine that the predetermined time has elapsed and control to end the cleaning is provided.
- the cleaning method of the CVD apparatus of the present invention is characterized in that the reaction gas supplied into the reaction chamber via the reaction gas supply path is subjected to plasma by applying high frequency to plasma, and the plasma-converted reaction gas is supplied to the inside of the reaction chamber.
- a counter electrode stage disposed in the reaction chamber and on which a substrate for forming a deposited film is disposed;
- a cleaning method of a CVD apparatus wherein a deposited film is formed on a substrate surface on the counter electrode stage by a plasma-formed reaction gas introduced into a reaction chamber through the reaction gas introduction device,
- the emission spectroscopy analyzer (OES) attached to the reaction chamber performs the emission spectroscopy analysis of the F radicals in the reaction chamber and measures the emission intensity.
- the mass analyzer analyzes the F intensity in the reaction chamber. Measure, or both, Exhaust gas components are analyzed by an infrared absorption analyzer (FTIR) arranged in a gas exhaust path for exhausting exhaust gas from the reaction chamber,
- FTIR infrared absorption analyzer
- the infrared absorption analyzer uses monitoring the density data of S i F 4 in the exhaust gas, as compared with the previously stored S i F 4 density data, upon reaching a predetermined chestnut one Jung endpoint concentration that the predetermined time has elapsed It is characterized in that the cleaning is completed after the determination.
- the emission intensity data of the F radicals in the reaction chamber can be monitored by the emission spectrometer, or the F intensity data in the reaction chamber can be monitored by the mass spectrometer, or both. After monitoring, compare the luminescence intensity data or F intensity data, or both data, to the luminescence intensity saturation point or the F intensity saturation point, and then use the infrared absorption analyzer Monitoring the concentration data of SiF 4 in the exhaust gas from the reaction chamber 1 and, when the concentration reaches a predetermined cleaning end point concentration, determines that a predetermined time has elapsed and ends the cleaning. ing.
- the cleaning in the reaction chamber is accurately determined.
- the cleaning can be ended at the time when the cleaning ends. .
- luminous intensity saturation point, or a predetermined time after reaching the F intensity saturation point, chestnut one since so as to end the Jung with in piping of the gas discharging passage deposition, the deposited S i 0 2, By-products such as Si 3 N 4 can be cleaned, and the cleaning can be finished at the time when the cleaning is finished correctly.
- the concentration of gasified SiF 4 generated by reacting with the by-product is directly monitored, and when the predetermined cleaning end point concentration is reached, the cleaning is completed, so that more accurate At the time when the cleaning ends, the cleaning can end.
- the cleaning time is not too short, and by-products such as Si S 2 and Si 3 N 4 that adhere to and accumulate on the walls of the reaction chamber, the surfaces of the electrodes, etc., and the piping of the gas exhaust path, etc. No by-products remain, and by-products can be completely removed.
- the cleaning time is not too long, and the cleaning gas introduced into the reaction chamber does not contribute to cleaning and is not discharged as it is.
- the cleaning gas composed of the fluorine-containing compound such as CF 4 and C 2 F 6 is not released into the atmosphere, and there is no possibility of adversely affecting the environment such as global warming.
- the emission intensity of F radicals by the emission spectrometer (OES) and the F intensity by the mass spectrometer are proportional to the etching rate of by-products (cleaning rate), cleaning is performed for a predetermined time with high cleaning efficiency. To maintain Therefore, the cleaning efficiency is improved.
- the cleaning end point concentration is 100 ppm.
- the cleaning end point concentration is 1 0 0 If ppm, the concentration of S i F 4 in the exhaust gas from the reaction Chang bar, the inner wall of the reaction chamber one, not only the front surface of such electrodes, gas discharge path adhesion etc. of the pipe, which corresponds to the concentration which can be completely removed deposited S I_ ⁇ 2, S i 3 N 4 of which by-products.
- the cleaning end point concentration at 100 ppm to end the cleaning, the cleaning can be completed at the time when the cleaning ends accurately, and as a result, by-products can be completely eliminated. Can be removed.
- the present invention is characterized in that the infrared absorption analyzer (FTIR) I is disposed downstream of a dry pump in the gas discharge path.
- FTIR infrared absorption analyzer
- the present invention is characterized in that the mass spectrometer is a quadrupole mass spectrometer (QM S), and is configured to use an intensity relative value to Ar as its F intensity. I do.
- QM S quadrupole mass spectrometer
- the mass analyzer an ion deposition mass analyzer (I AMS), as its F intensity, F- L i or F 2 - is configured to use L i It is characterized by the following.
- FIG. 1 is a schematic view showing an embodiment in which a cleaning apparatus for a CVD apparatus according to the present invention is applied to a CVD apparatus.
- FIG. 2 is a graph showing the relationship between time and emission intensity.
- FIG. 3 is a graph showing the relationship between the exhaust gas concentration and the time when the cleaning is repeated so that the cleaning is completed at T1 (90 seconds) when the light emission intensity saturation point P1 is reached.
- Figure 4 is a graph showing the relationship between the emission intensity of F radicals and the by-product etching rate (cleaning rate).
- FIG. 5 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- FIG. 6 is a graph showing the relationship between time one concentration (concentration of S i F 4).
- FIG. 7 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- FIG. 8 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- Figure 9 is a Dara off showing the relationship between F 2 calibration curve in a quadrupole mass spectrometer (QMS).
- FIG. 10 is a graph showing the relationship between F intensities when using F-Li in an ion attachment mass spectrometer (IAMS).
- IAMS ion attachment mass spectrometer
- FIG. 11 is a graph showing the relationship between F intensities when F 2 —Li is used in an ion attachment mass spectrometer (IAMS).
- IAMS ion attachment mass spectrometer
- FIG. 12 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- FIG. 13 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- FIG. 14 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- FIG. 15 is a schematic diagram showing a plasma CVD apparatus used in a conventional plasma CVD method.
- FIG. 1 shows a cleaning apparatus for a CVD apparatus according to the present invention applied to a CVD apparatus. It is the schematic which shows an Example.
- the plasma CVD apparatus 10 used in the plasma CVD method includes a reaction chamber 12 maintained in a reduced pressure state (vacuum state), and a bottom wall 12 of the reaction chamber 12.
- a reduced pressure state vacuum state
- the dry pump 14 By discharging the internal gas to the outside by the mechanical plaster pump 11, the dry pump 14, and the detoxification device 13 that detoxifies the exhaust gas through the exhaust path 16 formed in c.
- a constant vacuum state is maintained.
- a stage opposite electrode stage for placing a substrate A for depositing (including vapor deposition) a silicon thin film on the surface of a silicon wafer, for example, is formed inside the reaction chamber 112.
- the lower electrode 18 is disposed.
- the lower electrode 18 penetrates the bottom wall 12c of the reaction chamber 12 and is configured to be vertically slidable by a drive mechanism (not shown), so that the position can be adjusted.
- a seal member such as a seal ring is provided on a sliding portion between the lower electrode 18 and the bottom wall 12 c to secure a degree of vacuum in the reaction chamber 112. It is arranged.
- an upper electrode 20 constituting a reaction gas introduction device is provided above the reaction chamber 12, and a base end portion 22 thereof penetrates a top wall 12 a of the reaction chamber 12. Then, it is connected to a high-frequency power source 24 provided outside the reaction chamber 112.
- a high-frequency applying device 25 such as a high-frequency applying coil is provided on the upper electrode 20.
- a matching circuit (not shown) is provided between the high-frequency applying device 25 and the high-frequency power source 24. It is arranged. Thereby, the high frequency generated by the high frequency power supply 24 can be propagated to the high frequency applying device 25 such as a high frequency applying coil without loss.
- a reaction gas supply path 26 is formed in the upper electrode 20 so that a film is formed.
- the film forming gas is introduced from the reaction gas supply source 28 through the reaction gas supply path 26 and the upper electrode 20 into the reaction chamber 112 maintained in a reduced pressure state. I have.
- a clearing gas supply path 30 is branched and connected to the reaction gas supply path 26, and the cleaning gas from the cleaning gas source 34 is supplied to the reaction gas supply path 26 via the cleaning gas supply path 30. It can be introduced into the reaction chamber 112.
- an inert gas supply path 42 is branched and connected to the reaction gas supply path 26, and an inert gas such as Ar from the inert gas source 44 is inerted.
- the gas can be introduced into the reaction chamber 11 through the gas supply path 42.
- 52, 54, 56, 58 indicate on-off valves.
- the CVD device 10 of the present invention configured as described above is operated as follows.
- a substrate A for depositing a silicon-based thin film on the surface of, for example, a silicon wafer is placed on the stage of the lower electrode 18 of the reaction chamber 12, and the upper electrode 20 is driven by a driving mechanism (not shown). Is adjusted to a predetermined distance.
- the internal gas is exhausted to the outside via a dry pump 14 through an exhaust path 16 formed in the bottom wall 12 c of the reaction chamber 12, so that a constant vacuum state (decompression) is obtained.
- a constant vacuum state for example, a reduced pressure state of 10 to 2000 Pa is maintained.
- the on-off valve 52 provided in the reaction gas supply path 26 is opened, and from the film formation gas supply source 28, via the reaction gas supply path 26 and the upper electrode 20, A film forming gas is introduced into the reaction chamber 112 maintained in a reduced pressure state.
- the on-off valve 52 provided on the reaction gas supply path 26 and the on-off valve 54 provided on the exhaust path 16 are opened, and are provided on the tallying gas supply path 30.
- the open / close valve 56 and the open / close valve 58 provided in the inert gas supply path 42 are closed.
- the film forming gas supplied from the film forming gas supply source 2 8 if example embodiment, when forming the silicon oxide (S i 0 2) is monosilane (S i H 4), N the 2 0, N 2, 0 2 , a r , etc., when depositing silicon nitride (such as S i 3 N 4) is monosilane (S i H 4), NH 3, N 2, Rei_2 and a You can supply r.
- the film forming gas is not limited to this, but may be, for example, disilane (Si 2 H) as the film forming gas depending on the type of the thin film to be formed. 6 ), TEOS (tetraethoxysilane; S i (OC 2 H 5 ) 4), etc.
- the accompanying gas can be changed as appropriate, such as using o 2 , o 3, etc.
- the high frequency generated by the high frequency power supply 24 is used to generate a high frequency electric field from the high frequency application device 25 such as a high frequency application coil to the upper electrode 20, and electrons collide with neutral molecules in the film forming gas in the electric field. Then, high-frequency plasma is formed, and the film-forming gas is decomposed into ions and radicals. Then, a silicon-based thin film is formed on the surface of a substrate A such as a silicon wafer placed on the lower electrode 18 by the action of ions and radicals.
- the discharge in the reaction chamber 12 causes the inner wall of the reaction chamber 12 other than the substrate A to be formed into a film, the surface of the electrode, etc. also, a thin film material such as S i 0 2, S i 3 N 4 is deposited, the deposited by-products are formed.
- this by-product grows to a certain thickness, it separates and scatters due to its own weight, stress, and the like. It may cause contamination and contamination of fine particles in semiconductor products, make it impossible to manufacture high-quality thin films, cause disconnections and short circuits in semiconductor circuits, and may also reduce the yield.
- a fluorine-based cleaning gas containing a fluorine-containing compound that is, the cleaning gas from the cleaning gas source 34 is supplied to the cleaning gas supply path 30 and the reaction gas Introduced into the reaction chamber 112 via the supply path 26.
- the on-off valve 52 provided in the reaction gas supply path 26 is closed, and the reaction gas is supplied from the film formation gas supply source 28 into the reaction chamber 12. The supply of the film forming gas is stopped.
- the on-off valve 56 provided in the cleaning gas supply path 30 is opened, and the cleaning gas from the cleaning gas source 34 is supplied through the cleaning gas supply path 30 and the reaction gas supply path 26. Into the reaction chamber.
- a high frequency generated by the high frequency power supply 24 is applied to a high frequency application device 25 such as a high frequency application coil to generate a high frequency electric field on the upper electrode 20, thereby forming a high frequency plasma.
- a high frequency application device 25 such as a high frequency application coil to generate a high frequency electric field on the upper electrode 20, thereby forming a high frequency plasma.
- the cleaning gas introduced into the reaction chamber 12 is decomposed into ions and radicals, and these ions and radicals are converted into the side walls 12 b of the reaction chamber 12 and the surface 1 of the lower electrode 18.
- 8 a peripheral portion 1 attached to the 8 b of the deposited reacts with by-products such as S i 0 2, S i 3 N, a by-product is adapted to the gas as S i F 4.
- the cleaning gas introduced into the reaction chamber 112 causes the side wall 12 b of the reaction chamber 12 and the surface 18 a of the lower electrode 18 Attached to the circumferential portion 1 8 b, by-products such as S i 0 2, S i 3 N4 which deposited is gasified as S i F 4.
- the gasified by-products pass through the exhaust passage 16 formed in the bottom wall 12 c of the reaction chamber 12, and mechanically exhaust the exhaust gas through the exhaust pump 16, the one-star pump 11, the dry pump 14, and the exhaust gas.
- the detoxification device 13 discharges the internal gas to the outside.
- the cleaning gas introduced into the reaction chamber 112 causes the side wall 12 b of the reaction chamber 12 and the outer periphery 18 b of the surface 18 a of the lower electrode 18.
- the on-off valve 56 provided in the cleaning gas supply path 30 is closed to stop the introduction of the cleaning gas from the cleaning gas source 34. .
- the on-off valve 54 provided on the exhaust path 16 is opened, and the on-off valve 52 provided on the reaction gas supply path 26 is opened, so that the film forming gas supply source 2 is opened.
- the supply of the film forming gas into the reaction chamber 112 from step 8 is started, and the repetitive film forming process cycle is started.
- fluorine-based cleaning gas containing a fluorine compound used for the cleaning process for example,
- Alicyclic perfluorocarbons such as C 4 F 8 , C 5 F 10 and C 6 F 12 ;
- Cyclic perfluoroethers such as C 3 F 60 , C 4 F 8 O and C 5 F 10 O; Unsaturated systems per full O b carbon such as C 3 F 6, C 4 F 8, C 5 F 10;
- oxygen-containing perfluorocarbons such as COF 2 , CFsCOF, and CF 3 OF
- nitrogen-containing fluorine compounds such as NF 3 , FNO, F 3 NO, and FNO2
- oxygen- and nitrogen-containing fluorine compounds Can also be used.
- fluorinated compounds may be fluorinated compounds containing at least one fluorine atom in which part of the fluorine atoms has been replaced by hydrogen atoms.
- CF4 it is preferable to use C 2 F 6, C 3 F 8, it is more preferable to use CF 4, C 2 F 6.
- fluorinated compounds can be used alone or in combination of two or more.
- the cleaning gas containing a fluorine-containing compound used in the present invention can be used by appropriately mixing other gases as long as the effect of the present invention is not impaired.
- gases include He, Ne, Ar, and O2.
- the amount of such other gases is not particularly limited, and the amount and thickness of by-products (adhered matter) adhered to the inner wall of the reaction chamber 12 of the CVD apparatus 10, the fluorine-containing compound used, and the like. And the composition of by-products.
- a fluorine gas (F 2 ) can be used in addition to the fluorine-based cleaning gas containing a fluorine compound.
- an appropriate amount of an additional gas such as oxygen or argon is mixed and used together with the cleaning gas.
- an additional gas such as oxygen or argon
- the concentration of the cleaning gas is increased under the condition that the total gas flow rate is constant, the etching speed tends to increase.
- the concentration of the cleaning gas exceeds a certain level, there are problems such as instability of plasma generation, slowdown and reduction of etching rate, and deterioration of cleaning uniformity.
- the cleaning gas is used at a concentration of 100%, instability of plasma generation, slowing down or lowering of the etching speed, and deterioration of cleaning uniformity tend to be more remarkable. There is a problem of lack of sex.
- the cleaning conditions are optimized by increasing the chamber pressure during cleaning or by increasing the gas flow rate. However, if the chamber pressure during cleaning is increased or the gas flow rate is increased, plasma generation becomes unstable, cleaning uniformity is impaired, and efficient cleaning is performed. You will not be able to do it.
- fluorine gas or a mixed gas of fluorine gas and a gas that does not substantially react with fluorine in plasma is used as a cleaning gas
- plasma processing can be performed, and an extremely excellent etching rate can be obtained.
- plasma can be generated stably even under the condition that the total gas flow rate is about 100 seem and the chamber pressure is about 400 Pa, and good cleaning uniformity is obtained. Can be secured.
- the fluorine gas to be used as such CREE Eng gas is a 1 0 0 volume 0/0 of the fluorine gas, a fluorine gas for generating the plasma by the discharge Is desirable.
- the cleaning gas may be composed of a fluorine gas that generates plasma by electric discharge and a gas that does not substantially react with fluorine in the plasma.
- the gas that does not substantially react with fluorine in the plasma is preferably at least one selected from the group consisting of nitrogen, oxygen, carbon dioxide, N 20 , dry air, argon, helium, and neon.
- fluorine in the gas that does not substantially react with fluorine includes a fluorine molecule, a fluorine atom, a fluorine radical, a fluorine ion, and the like.
- target compound for chamber cleaning using such a fluorine-based compound include a deposit made of a silicon-based compound, which is attached to one wall of the CVD chamber or a jig of the CVD apparatus by a CVD method or the like.
- silicon-based compound deposits include, for example,
- a compound consisting of silicon (2) a compound comprising at least one of oxygen, nitrogen, fluorine or carbon and silicon, or
- the flow rate of the cleaning gas into the reaction chamber 112 is preferably 0.1 to 1 OLZ. Is preferably 0.5 to 1 LZ. That is, if the flow rate of the cleaning gas introduced into the reaction chamber 112 is less than 0.1 LZ, the above-described cleaning effect cannot be expected. Conversely, the flow rate of the cleaning gas becomes larger than 10 LZ. For example, the amount of the cleaning gas discharged to the outside without contributing to cleaning is increased.
- the introduction flow rate can be appropriately changed depending on the type and size of the substrate A such as a flat panel disk.
- the fluorine-containing compound is C 2 F 6
- the amount may be 0.5 to 5 L.
- the pressure of the cleaning gas in the reaction chamber 112 is 10 to 200, taking into account the effect of cleaning the by-product adhering to the wall of the chamber 112 described above. Pa, and preferably 50 to 500 Pa. That is, if the pressure of the cleaning gas in the reaction chamber 112 is smaller than 10 Pa, or conversely, if the pressure in the reaction chamber 112 is larger than 2000 Pa, This is because the above cleaning effect cannot be expected.
- the pressure in the reaction chamber 112 can be appropriately changed depending on the type and size of the substrate A such as a flat panel disk. For example, when the fluorine-containing compound is C 2 F 6 , 100 ⁇ 500 Pa, let's go.
- the cleaning time is empirically determined and the cleaning is currently completed.
- the period of the cleaning is too short, the inner wall of the reaction Champa one 1 2, attached to the surface such as an electrode, by-products such as S i 0 2, S i 3 N 4 which deposited becomes Rukoto be residual,
- CVD equipment causes the incorporation and contamination of fine particles into semiconductor products, making it impossible to manufacture high-quality thin films, causing disconnection and short-circuiting of semiconductor circuits, In addition, the yield will decrease.
- the cleaning time is too long, the cleaning gas introduced into the reaction chamber 12 will be discharged as it is without contributing to the cleaning. For this reason, a cleaning gas composed of a fluorinated compound such as CF 4 , C 2 F 6 , and COF 2 may be released into the atmosphere, which may have an adverse effect on the environment.
- a fluorinated compound such as CF 4 , C 2 F 6 , and COF 2
- the emission intensity of the F radical in the reaction chamber 12 reaches the emission intensity saturation point P1 after 90 seconds in this example, as shown in the time-emission intensity graph of FIG. .
- the emission intensity data of the F radical in the reaction chamber 12 is monitored by an emission spectroscopy (OES) 40 (optical emission spectroscopy) 40, and the emission intensity data previously stored by the cleaning controller 60 is monitored. In comparison, is the emission intensity saturation point reached? Determine if
- the cleaning is controlled by the cleaning controller 60 so as to end the cleaning.
- the F radicals are excited in the reaction chamber 112
- the amount that contributes to the clearing and returns to the original state is quantified, and the cleaning by the reaction chamber ⁇ is performed. Cleaning can be finished at the time when the cleaning ends correctly.
- the cleaning is terminated at the time T3, so that S i 0 2 , S By-products such as i 3 N 4 can be tallied, and the cleaning can be completed at the time when the talli- ng ends correctly.
- the inner wall of the reaction chamber one surface such as an electrode, and adhere in a pipe or the like of the gas discharge passage, the deposited S I_ ⁇ 2, by-products such as S i 3 N4 No by-products remain, and by-products can be completely removed.
- the cleaning time is not too long, and the cleaning gas introduced into the reaction chamber 12 does not contribute to cleaning and is not discharged as it is.
- a cleaning gas composed of a fluorine-containing compound such as CF 4 or C 2 F 6 It is not released into the atmosphere and there is no risk of adverse effects on the environment such as global warming.
- Such a predetermined time T2 depends on the size of the reaction chamber 12 of the CVD apparatus 10, but it depends on the size of the reaction chamber 12 and the inner wall of the reaction chamber 1, the surface of the electrodes, etc., and the S deposited and deposited on the gas exhaust path piping, etc. I_ ⁇ 2, S i-products without reside remaining such 3N4, in order to completely remove the by-products, as described below, as shown in the graph of FIG. 6, the infrared absorption analyzer by, based on S i F 4 density data in the exhaust gas from the reaction chamber one, 1 5-5 0 second after, good Mashiku is to the 2 0-3 0 seconds is desirable.
- the cleaning is performed at the time T1 (90 seconds) when the emission intensity saturation point P1 is reached.
- the emission intensity of F radicals by the emission spectrometer is proportional to the etching rate of by-products (cleaning rate), so that the cleaning efficiency is high. Since the cleaning is maintained for a predetermined time in the state, the cleaning efficiency is improved.
- Such an emission spectrometer is not particularly limited.
- a plasma process monitor C 7460 manufactured by Hamamatsu Photo-Tas Corporation can be used. .
- FIG. 5 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- the CVD apparatus 10 of this embodiment has basically the same configuration as the C.VD apparatus 10 shown in FIG. 1, and the same components are denoted by the same reference numerals and detailed description thereof will be omitted. Description is omitted.
- the emission spectroscopic analysis of F radicals in the reaction chamber 12 is performed between the side of the reaction chamber 12 and the side wall 12 b of the reaction chamber 12 to emit light.
- An emission spectrometer (OES) 40 for measuring the intensity is attached.
- FT IR infrared absorption analyzer
- the infrared absorption analyzer 50 by monitoring the density data of S i F 4 in flue gas from the reaction chamber one 12, the cleaning control device 6 0, the S i F 4 previously stored density data It is configured to perform control so as to end the cleaning at the time T4 when the predetermined culling end point concentration Q1 is reached, as compared with the above.
- the reaction chamber one inner wall during Kuriengu, surface such as an electrode, and adhere in a pipe or the like of the gas discharge path, S i 0 2, by-products such as S i 3 N 4 which deposited the concentration of reacted S i F 4 which is gasified arising because directly will be monitored and, when the exact cleaning is completed Cleaning can be completed in the meantime.
- the cleaning time is not too long, and the cleaning gas introduced into the reaction chamber is not discharged as it is without contributing to the cleaning.
- the cleaning gas composed of a fluorine-containing compound such as CF 4 and C 2 F 6 is not released into the atmosphere, and there is no possibility that the cleaning gas has an adverse effect on the environment such as global warming.
- the concentration of the cleaning end point depends on the size of the reaction chamber 112 of the CVD apparatus 110, but it adheres and accumulates on the inner wall of the reaction chamber 1, the surface of the electrodes, etc., and the piping of the gas discharge path.
- the content is preferably 100 ppm.
- the concentration of SiF4 in the exhaust gas from the reaction chamber will not only increase the surface of the inner wall and electrodes of the reaction chamber, but also the gas exhaust path. attached in a pipe or the like, and corresponds to the concentration which can completely remove the by-products such as S io 2, S i 3 N4 deposited.
- cleaning is completed when the concentration at the cleaning end point is 100 ppm.
- the cleaning can be completed at the time T4 (in this embodiment, after 117 seconds) at which the cleaning is correctly completed, and as a result, by-products can be completely removed. .
- the present invention can be applied not only to the parallel plate type plasma CVD apparatus shown in FIG. 1 but also to a remote plasma CVD apparatus.
- FTIR infrared absorption analyzer
- FIG. 7 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- the CVD apparatus 10 of this embodiment has basically the same configuration as the CVD apparatus 10 shown in FIGS. 1 and 5, and the same components are denoted by the same reference numerals, and the details thereof will be described. Detailed description is omitted.
- an exhaust path 16 which is a gas exhaust path, a downstream side of the dry pump 14 and a dry pump and abatement apparatus 13 are connected.
- an infrared absorption analyzer (FTIR) 50 for analyzing exhaust gas components has been installed. That is, in the CVD apparatus 10 of this embodiment, the emission intensity of the F radicals in the reaction chamber 12 is, as shown in the time-emission intensity graph of FIG. The light emission intensity reaches the saturation point P1. This is then monitored by the optical power spectroscopy (OES) (optical emission spectro analysis) 4 °, and the emission intensity data of F radicals in the reaction chamber 12 is monitored by the cleaning controller 60. It is compared with the luminescence intensity data stored in advance to determine whether the luminescence intensity saturation point has been reached.
- OES optical power spectroscopy
- the cleaning is continued, and the concentration data of SiF 4 in the exhaust gas from the reaction chamber 112 is monitored by the infrared absorption analyzer 50, and the cleaning control device 60 in, as compared with the previously stored S i F 4 density data, at time T 4 has reached a predetermined chestnut-learning endpoint concentration Q 1, is configured to control so as to terminate the chestnut one Jung ing.
- the emission spectrometer 40 monitors the emission intensity data of F radicals in the reaction chamber 1 and compares the emission intensity data with the emission intensity data stored in advance. absorption analyzer monitoring the concentration data of S i F 4 in the exhaust gas from the reaction Ji Yanpa, upon reaching a predetermined cleaning end point concentration, it is determined that the predetermined time has elapsed, terminate the cleaning It is supposed to.
- the amount that contributes to the cleaning and returns to the original state is quantified, and the cleaning in the reaction chamber is accurately performed.
- the cleaning can be ended at the time when the cleaning ends.
- the cleaning is completed after a predetermined time from the point when the emission intensity reaches the saturation point.
- the cleaning can be completed at the time when the cleaning is accurately completed.
- the cleaning can be completed at the time when the cleaning is completed more accurately.
- FIG. 8 is a schematic view showing another embodiment in which the cleaning apparatus for a CVD apparatus of the present invention is applied to a CVD apparatus.
- the CVD apparatus 10 of this embodiment has basically the same configuration as the CVD apparatus 10 shown in FIG. 1, and the same components are denoted by the same reference numerals, and detailed description thereof is omitted. I do.
- a mass spectrometer for measuring the F intensity in the reaction chamber 12 is used instead of the emission spectrometer (OES) 40 of the CVD apparatus 10 of the embodiment of FIG. 1.
- Reference numeral 70 is attached to a pipe branched from the side wall 12 b of the reaction chamber 12.
- the mass spectrometer 70 is preferably a quadrupole mass spectrometer (QMS), and is desirably configured to use an intensity relative value to Ar as the F intensity.
- QMS quadrupole mass spectrometer
- the present inventors prepared an F 2 calibration curve usable for each mass spectrometer, and conducted an experiment of a measurement (analysis) method. That is, using two different types of quadrupole mass spectrometers, the preparation of an F 2 calibration curve and the method of quantifying F 2 gas were studied.
- QMS (1) (manufactured by ULVAC, Inc.) and QMS (2) (manufactured by ANELVA, Inc.)
- S2 (1) data based on mZe of Ar gas 40 Ar + ion current value (ion current value when 1 SLM flows).
- the calibration reference value of the Ar gas ion current value used in QMS (1) with F2 gas flowing through QMS (2) and the Ar ion current value when Ar gas flows 1 S LM into QMS (2) are shown below.
- the calibration of the F 2+ ion current value obtained by QMS (2) was performed, and the method was evaluated.
- FIG. 9 shows a comparison result of the F 2 + ion current values of QMS (1) and QMS (2) using the Ar gas of QMS (1) as a calibration standard.
- FIG. 9 shows a comparison result of the F 2 + ion current values of QMS (1) and QMS (2) using the Ar gas of QMS (1) as a calibration standard.
- the mass spectrometer 70 is an ion attachment mass spectrometer (IAMS), and is preferably configured to use F—Li or F 2 —Li as its F intensity. . That is, based on the graphs shown in FIG. 10 and FIG. 11, it is possible to efficiently detect the end point by turning on the RF and monitoring the detection intensity of the F intensity after the OFF.
- IAMS ion attachment mass spectrometer
- the mass spectrometer is an ion attachment mass spectrometer (IASS) and its F intensity is F-L i or F 2 -L i, the inside of the reaction chamber This means that the amount that contributed to cleaning after the F radicals were excited and returned to the original state was quantified, and the cleaning in the reaction chamber was accurately cleaned at the time when cleaning was completed. Can be terminated.
- IASS ion attachment mass spectrometer
- the mass spectrometer 70 is used alone. Although not shown, this is combined with the emission spectrometer (OES) 40 and the infrared absorption spectrometer (FTIR) 50. It is also possible to use. That is, for example, as shown in FIG. 12, an emission spectrometer (OES) 40 and a mass analyzer 70 are provided in parallel, and the emission spectrometer 40 and / or the mass analyzer 70 are provided. It is also possible to monitor the emission intensity data of F radicals in the reaction chamber, the F intensity data, or both.
- OES emission spectrometer
- FTIR infrared absorption spectrometer
- an infrared absorption analyzer (FT IR) 50 and a mass analyzer 70 can be used in combination, and further, as shown in FIG. It can also be used in combination with an emission spectrometer (OES) 40 and an infrared absorption analyzer (FTIR) 50.
- OES emission spectrometer
- FTIR infrared absorption analyzer
- the horizontal type apparatus has been described.
- the apparatus may be changed to a vertical type apparatus.
- a single wafer type apparatus has been described. It can be applied to the type CVD equipment.
- the present invention is applied to a plasma CVD apparatus as an example.However, a thin film material is deposited on a substrate by thermal decomposition, oxidation, reduction, polymerization, gas phase reaction, or the like at a high temperature, vacuum deposition. It goes without saying that various modifications are possible, such as being applicable to other CVD methods such as the CVD method.
- the emission intensity saturation point of F radicals in the reaction chamber 1 or the emission intensity saturation point of F radicals in the reaction chamber 1 is measured by emission spectroscopy using an emission spectrometer (OES), measurement of F intensity by a mass analyzer, or both. Cleaning is terminated after a predetermined time from reaching the intensity saturation point.
- OES emission spectrometer
- the amount of the F radicals that contributes to the talling and returns to the original state is quantified, and the cleaning in the reaction chamber is performed.
- the cleaning can be ended at the time when the cleaning ends exactly.
- the cleaning is terminated after a predetermined time has elapsed after reaching the emission intensity saturation point or the F intensity saturation point, so that S i ⁇ 2 and S i deposited and deposited on the piping of the gas discharge path, etc. 3
- Clean by-products such as N4 C can therefore be terminated chestnut one Jung to accurately time the chestnut-learning is completed, without cleaning time is too short, the inner wall of the reaction chamber one surface such as an electrode, and the gas discharge path
- By-products such as Si ⁇ 2 and Si 3 N4 adhered and deposited on pipes do not remain, and by-products can be completely removed.
- the cleaning time is not too long, and the cleaning gas introduced into the reaction chamber is not discharged as it is without contributing to the cleaning.
- the cleaning gas composed of a fluorine-containing compound such as CF 4 and C 2 F 6 is not released into the atmosphere, and there is no possibility that the cleaning gas has an adverse effect on the environment such as global warming.
- the emission intensity of F radicals by the emission spectrometer (OES) and the F intensity by the mass analyzer are proportional to the by-product etching rate (cleaning rate). Cleaning efficiency is improved because time cleaning is maintained.
- the concentration data of SiF 4 in the exhaust gas from the reaction chamber 1 is monitored by the infrared absorption analyzer arranged in the gas discharge path, and the concentration at the predetermined cleaning end point is measured. The cleaning is terminated when the pressure reaches.
- the reaction chamber one inner wall during cleaning, the surface of such electrode, rabbi deposited in a pipe or the like of the gas discharging paths, deposited such S i 0 2, S i 3 N 4 sub Since the concentration of the product gas of resulting reacts with been S i F 4 directly becomes a monitor child can you to exit the Kuriyungu exactly time cleaning is completed.
- the inner wall of the reaction chamber one surface such as an electrode, and adhere in a pipe or the like of the gas discharge passage, the deposited by-products such as S i 0 2, S i 3 N 4 No by-products remain, and by-products can be completely removed.
- the cleaning time is not too long, and the cleaning gas introduced into the reaction chamber is not discharged as it is without contributing to the cleaning.
- the cleaning gas composed of a fluorine-containing compound such as CF 4 and C 2 F 6 is not released into the atmosphere, and there is no possibility that the cleaning gas has an adverse effect on the environment such as global warming.
- the emission intensity data of F radicals in the reaction chamber 1 is monitored by an emission spectrometer, or the F intensity data in the reaction chamber 1 is monitored by a mass analyzer. Monitor both or both data and compare them with pre-stored luminescence intensity data and / or F intensity data to determine the luminescence intensity saturation point and / or F intensity saturation point.
- concentration data of SiF 4 in the exhaust gas from the reaction chamber was monitored by the infrared absorption analyzer, and it was determined that the predetermined time had elapsed when the concentration reached the predetermined cleaning end point concentration. Tally Ending.
- the amount contributing to the talling and returning to the original state is quantified, and the clearing in the reaction chamber is determined.
- the cleaning can be ended at the time when the cleaning ends exactly.
- the cleaning force is also set to stop after a predetermined time from reaching the emission intensity saturation point or the F intensity saturation point, so that S i 0 2 deposited and deposited on the piping of the gas discharge path, etc.
- By-products such as Si 3 N 4 can be cleaned and cleaning can be terminated at the exact time when cleaning is completed.
- the predetermined time the concentration of S i F 4 which is gasified caused to react with by-product is directly monitored, upon reaching a predetermined cleaning end point concentration, so ends the cleaning, more precisely The cleaning can be ended at the time when the cleaning ends.
- the cleaning time is not too long, and the cleaning gas introduced into the reaction chamber is not discharged as it is without contributing to the cleaning.
- a cleaning gas composed of a fluorine-containing compound such as CF 4 or C 2 F 6 It is not released into the atmosphere and has adverse effects on the environment such as global warming.
- the emission intensity of F radicals by the emission spectrometer (OES) and the F intensity by the mass analyzer are proportional to the etching rate of by-products (cleaning rate). Since cleaning time is maintained, cleaning efficiency is improved.
- the concentration of SiF 4 in the exhaust gas from the reaction chamber 1 is limited to only the inner wall of the reaction chamber 1, the surface of the electrode, and the like. not corresponds to the concentration which can be completely removed, such as the pipe attachment, the S i 0 2, by-products such as S i 3 N 4 which deposited the gas discharge path. Therefore, by setting the cleaning end point concentration at 100 ppm to end the cleaning, the cleaning can be ended at the time when the cleaning ends accurately, and as a result, By-products can be completely removed.
- the infrared absorption analyzer is provided downstream of the dry pump in the gas discharge path, not only from the reaction chamber but also a pipe in the gas discharge path. since the density data of S i F 4 in the exhaust gas that is monitoring, the inner wall of the reaction chamber one, not only the surface of such electrodes, deposited in a pipe or the like of the gas discharge passage, the deposited S I_ ⁇ 2 By-products such as Si 3N4 can be completely removed.
- a quadrupole mass spectrometer (QMS) is used as the mass spectrometer, and the intensity relative value to Ar is used as the F intensity, whereby the reaction chamber can be controlled.
- QMS quadrupole mass spectrometer
- Ar the intensity relative value to Ar
- the reaction chamber can be controlled.
- the amount of the F radicals that have been excited and contributed to cleaning and returned to the original state has been quantified, and the time required for accurate cleaning of the cleaning in the reaction chamber is completed. To cleanin Can be terminated.
- the mass spectrometer is an ion attachment mass spectrometer (I AM S), and F-Li or F 2 -Li is used as the F intensity
- I AM S ion attachment mass spectrometer
- F-Li or F 2 -Li is used as the F intensity
Description
Claims
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US10/548,874 US8043438B2 (en) | 2003-03-14 | 2004-03-12 | Device for cleaning CVD device and method of cleaning CVD device |
EP04720142A EP1612856B8 (en) | 2003-03-14 | 2004-03-12 | Device for cleaning cvd device and method of cleaning cvd device |
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JP2003070329A JP4385086B2 (ja) | 2003-03-14 | 2003-03-14 | Cvd装置のクリーニング装置およびcvd装置のクリーニング方法 |
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US (1) | US8043438B2 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
JP4385086B2 (ja) | 2009-12-16 |
JP2004281673A (ja) | 2004-10-07 |
EP1612856B8 (en) | 2012-02-08 |
US20060207630A1 (en) | 2006-09-21 |
EP1612856A4 (en) | 2009-01-28 |
EP1612856B1 (en) | 2011-08-24 |
EP1612856A1 (en) | 2006-01-04 |
US8043438B2 (en) | 2011-10-25 |
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