WO2011018900A1 - エッチング方法 - Google Patents
エッチング方法 Download PDFInfo
- Publication number
- WO2011018900A1 WO2011018900A1 PCT/JP2010/005053 JP2010005053W WO2011018900A1 WO 2011018900 A1 WO2011018900 A1 WO 2011018900A1 JP 2010005053 W JP2010005053 W JP 2010005053W WO 2011018900 A1 WO2011018900 A1 WO 2011018900A1
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- WO
- WIPO (PCT)
- Prior art keywords
- etching
- containing gas
- protective film
- fluorine
- hydrogen halide
- Prior art date
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- 238000005530 etching Methods 0.000 title claims abstract description 154
- 238000000034 method Methods 0.000 title claims abstract description 93
- 239000007789 gas Substances 0.000 claims abstract description 160
- 230000001681 protective effect Effects 0.000 claims abstract description 93
- 239000011737 fluorine Substances 0.000 claims abstract description 84
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 84
- 239000000758 substrate Substances 0.000 claims abstract description 63
- 229910000039 hydrogen halide Inorganic materials 0.000 claims abstract description 57
- 239000012433 hydrogen halide Substances 0.000 claims abstract description 57
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 57
- 239000010703 silicon Substances 0.000 claims abstract description 57
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000011343 solid material Substances 0.000 claims abstract description 13
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 74
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 claims description 10
- 229910000042 hydrogen bromide Inorganic materials 0.000 claims description 5
- 238000004544 sputter deposition Methods 0.000 claims description 5
- 229910018503 SF6 Inorganic materials 0.000 claims description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 4
- BLIQUJLAJXRXSG-UHFFFAOYSA-N 1-benzyl-3-(trifluoromethyl)pyrrolidin-1-ium-3-carboxylate Chemical compound C1C(C(=O)O)(C(F)(F)F)CCN1CC1=CC=CC=C1 BLIQUJLAJXRXSG-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 3
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 3
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims description 3
- 229910000043 hydrogen iodide Inorganic materials 0.000 claims description 3
- PDJAZCSYYQODQF-UHFFFAOYSA-N iodine monofluoride Chemical compound IF PDJAZCSYYQODQF-UHFFFAOYSA-N 0.000 claims description 3
- QKCGXXHCELUCKW-UHFFFAOYSA-N n-[4-[4-(dinaphthalen-2-ylamino)phenyl]phenyl]-n-naphthalen-2-ylnaphthalen-2-amine Chemical compound C1=CC=CC2=CC(N(C=3C=CC(=CC=3)C=3C=CC(=CC=3)N(C=3C=C4C=CC=CC4=CC=3)C=3C=C4C=CC=CC4=CC=3)C3=CC4=CC=CC=C4C=C3)=CC=C21 QKCGXXHCELUCKW-UHFFFAOYSA-N 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 claims 1
- 150000002367 halogens Chemical class 0.000 claims 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 abstract 3
- 230000005611 electricity Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 10
- 230000007935 neutral effect Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical class FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- H01L21/30655—Plasma etching; Reactive-ion etching comprising alternated and repeated etching and passivation steps, e.g. Bosch process
-
- 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 an etching method, and more particularly, to an etching method of an object to be processed made of silicon.
- trenches trenches and via holes (holes) formed in a silicon substrate for the purpose of element isolation and memory cell capacity area have a high aspect ratio (depth of trench (or via hole) / trench (or via hole). ))) Is required.
- the side wall is prevented from being etched by forming a protective film.
- the trench and the via hole are formed while repeating the etching process and the protective film forming process, there is a problem in that the side walls are uneven.
- Etching of the silicon substrate is performed on a portion exposed from the mask after a mask having a predetermined shape is formed on the silicon substrate.
- fluorine radicals are likely to circulate in the portion directly under the mask, and the protective film is easily damaged.
- the side wall is also etched, and there is a problem that a trench or a via hole having a desired shape cannot be obtained.
- an object of the present invention is to provide an etching method capable of forming a trench or a via hole having a desired aspect ratio and shape with respect to an object to be processed made of silicon.
- a method for generating a plasma in a processing chamber and etching an object to be processed made of silicon on a substrate electrode installed in the processing chamber A hydrogen halide-containing gas using etching step for introducing the containing gas to etch the object to be processed, a fluorine-containing gas using etching step for introducing the fluorine-containing gas into the processing chamber and etching the object to be processed, A protective film forming step of forming a protective film on the object to be processed by sputtering a solid material placed opposite to the object to be processed; and applying a high-frequency bias power to the substrate electrode, A protective film removing step for removing a part of the film, and the etching process using fluorine-containing gas, the protective film forming step, and the protective film removing step are repeated in this order.
- the fluorine-containing gas using etching process, the protective film forming process, and the protective film removing process need only be repeated in this order, and either the fluorine-containing gas using etching process or the protective film forming process is the first. Also good.
- the etching process using the hydrogen halide-containing gas is performed first. That is, a mask having a predetermined shape is formed on the surface of the object to be processed, and it is preferable to etch silicon immediately below the mask using a hydrogen halide-containing gas.
- the fluorine-containing gas use etching step, the protective film formation step, and the protective film removal step can be repeated in this order after the hydrogen halide-containing gas use etching step.
- the 1st aspect of this invention repeats the said fluorine-containing gas use etching process, the said protective film formation process, and the said protective film removal process in this order, and then performs the said hydrogen halide containing gas use etching process. You can also.
- the hydrogen halide-containing gas using etching step, the fluorine-containing gas using etching step, the protective film forming step, and the protective film removing step are repeated in this order. It can also be done alternately.
- a method for generating a plasma in a processing chamber and etching an object to be processed made of silicon on a substrate electrode installed in the processing chamber Etching process using hydrogen halide-containing gas for introducing the contained gas to etch the object to be processed, and sputtering a solid material placed opposite to the object to be processed, and a protective film on the object to be processed Forming a protective film, and introducing fluorine-containing gas into the processing chamber and applying a high frequency bias power to the substrate electrode to remove the protective film and etching the object to be processed
- An etching process using a contained gas, and the protective film forming process and the etching process using a fluorine-containing gas are repeated in this order.
- the hydrogen halide-containing gas-using etching step it is preferable to perform the hydrogen halide-containing gas-using etching step first. That is, a mask having a predetermined shape is formed on the surface of the object to be processed, and it is preferable to etch silicon immediately below the mask using a hydrogen halide-containing gas.
- the protective film forming step and the fluorine-containing gas use etching step can be repeated in this order after the hydrogen halide-containing gas use etching step.
- the protective film forming step and the fluorine-containing gas-use etching step are repeated in this order, and then the hydrogen halide-containing gas-use etching step can be performed.
- the hydrogen halide-containing gas using etching step, and the protective film forming step and the fluorine-containing gas using etching step may be alternately performed in this order.
- the hydrogen halide-containing gas preferably contains fluorine.
- the hydrogen halide may be at least one selected from the group consisting of hydrogen iodide, hydrogen chloride, and hydrogen bromide.
- the fluorine-containing gas is sulfur hexafluoride gas, nitrogen trifluoride gas, fluorine gas, silicon tetrafluoride gas, xenon difluoride gas, iodine fluoride. It may contain at least one selected from the group consisting of a gas and an iodinated fluorocarbon gas.
- the solid material can be configured using a material selected from the group consisting of fluororesin, silicon, carbon, silicon carbide, silicon oxide and silicon nitride. .
- the process includes an etching process using a hydrogen halide-containing gas, an etching process using a fluorine-containing gas, a protective film forming process, and a protective film removing process, and a fluorine-containing gas using etching process. Since the protective film forming step and the protective film removing step are repeated in this order, trenches and via holes having a desired aspect ratio and shape can be formed on the target object made of silicon.
- the method includes an etching process using a hydrogen halide-containing gas, a protective film forming process, and an etching process using a fluorine-containing gas, and includes the protective film forming process and the fluorine-containing gas using etching process. Since the steps are repeated in this order, trenches and via holes having a desired aspect ratio and shape can be formed on the object to be processed made of silicon. Moreover, in the etching process using fluorine-containing gas, the object to be processed is etched while removing a part of the protective film, so that the total number of processes can be reduced.
- (A)-(e) is a typical fragmentary sectional view of a silicon substrate.
- FIG. 1 shows an NLD (Magnetic Neutral Loop Discharge) type etching apparatus used in this embodiment. Since the NLD method can control the diameter and size of the plasma, it has an advantage that etching and sputtering can be performed with higher precision than the normal method, and is preferably used in the present invention. However, the present invention is not limited to the NLD method, and any other etching device may be used as long as it can generate plasma.
- NLD Magnetic Neutral Loop Discharge
- a vacuum chamber 1 as a processing chamber includes an upper plasma generation unit 2 and a lower substrate processing unit 3.
- the substrate processing unit 3 is provided with an exhaust port 4, and the exhaust port 4 is connected to an appropriate exhaust system (not shown).
- three magnetic field coils 5, 6, and 7 are provided outside the plasma generator 2.
- a magnetic neutral line is formed inside the vacuum chamber 1 by these magnetic field coils.
- the substrate processing unit 3 is provided with a substrate electrode 8, and a silicon substrate 9 as an object to be processed is placed on the substrate electrode 8.
- the substrate electrode 8 is connected via a blocking capacitor 10 to a high frequency bias power source 11 that applies an RF bias.
- three high-frequency antenna coils 12 for generating plasma are arranged. These high-frequency antenna coils 12 are connected to a high-frequency power source 13 so that an AC electric field can be applied along the magnetic neutral line formed in the plasma generator 2 by the three magnetic field coils 5, 6, and 7. ing. Thereby, discharge plasma can be generated in the magnetic neutral wire.
- the top plate in the plasma generation unit 2 is maintained in a floating state in terms of potential and acts as a floating electrode 14.
- a solid material 15 is installed on the floating electrode 14.
- the solid material 15 is configured using, for example, a fluororesin, silicon, carbon, silicon carbide, silicon oxide, or silicon nitride.
- the power supply path from the high frequency power supply 13 to the high frequency antenna coil 12 is branched in the middle, and is directed from the variable capacitor 16 to the floating electrode 14.
- high frequency power is intermittently applied from the high frequency power supply 13 to the floating electrode 14, and a self bias is generated in the floating electrode 14.
- a switch may be used instead of the variable capacitor 16.
- a high frequency power source for the floating electrode 14 and a high frequency power source for the high frequency antenna coil 12 may be provided separately.
- the vacuum chamber 1 is connected to a supply path 17 for supplying a hydrogen halide-containing gas and a supply path 18 for supplying a fluorine-containing gas.
- a control device 19 is provided in the middle of the supply path 17 to control the supply and stop of the hydrogen halide-containing gas and the flow rate during the supply.
- a control device 20 is also provided in the middle of the supply path 18 to control the supply and stop of the fluorine-containing gas and the flow rate during the supply.
- a supply path 21 for supplying a rare gas is connected downstream of the control device 20, and a fluorine-containing gas and a rare gas are mixed in the gas mixing unit 22. Thereby, these mixed gases can be supplied to the vacuum chamber 1. Further, if the supply of the fluorine-containing gas is stopped by the control device 20, only the rare gas can be supplied to the vacuum chamber 1.
- a fluorine-containing gas supply path and a rare gas supply path may be provided separately.
- the hydrogen halide for example, hydrogen iodide, hydrogen chloride, or hydrogen bromide can be used.
- the hydrogen halide-containing gas can contain a gas other than hydrogen halide, and particularly preferably contains fluorine or oxygen. By including fluorine, the etching rate is increased and the throughput is improved. In addition, when oxygen is contained, a product formed by the reaction between hydrogen halide and silicon is decomposed, and etching proceeds smoothly.
- the fluorine-containing gas is sulfur hexafluoride (SF 6 ) gas, nitrogen trifluoride (NF 3 ) gas, fluorine (F 2 ) gas, silicon tetrafluoride (SiF 4 ) gas, xenon difluoride (XeF 2 ) Gas, iodine fluoride (IF 5 or IF 7 ) gas, or iodinated fluorocarbon gas can be used, but sulfur hexafluoride is preferably used.
- the rare gas argon (Ar), xenon (Xe), krypton (Kr), nitrogen (N 2 ), or the like can be used.
- a hydrogen halide-containing gas is introduced into the vacuum chamber 1 to etch the silicon substrate 9.
- a mask (not shown) having a predetermined pattern is provided on the surface of the silicon substrate 9.
- the mask may be an inorganic material such as SiO 2, or may be a photosensitive resist made of acrylic resin or silicone resin, or a thermosetting resist made of epoxy resin. The mask is removed by ashing or the like after the formation of the trench and via hole is completed.
- control device 19 is operated to introduce a hydrogen halide-containing gas into the vacuum chamber 1.
- the variable capacitor 16 is turned off so that the high frequency power is not supplied to the floating electrode 14.
- the high frequency bias power supply 11 is turned on so that high frequency power is supplied to the substrate electrode 8.
- power for generating plasma is supplied from the high frequency power supply 13 to the high frequency antenna coil 12. Thereby, the silicon substrate 9 is etched.
- a mixed gas of HBr, SF 6 and O 2 is used as the hydrogen halide-containing gas
- He gas is used as the rare gas
- the pressure in the vacuum chamber is 2 Pa
- the output of the high-frequency power source is 2000 W
- the high-frequency bias power source When etching was performed with an output of 100 W and a high-frequency bias power supply frequency of 12.56 MHz, the etching rate was 5.75 ⁇ m / min.
- the flow rates of the etching gas were 75 sccm for HBr gas, 50 sccm for SF 6 gas, and 100 sccm for O 2 gas.
- the pressure of He gas was 1330 Pa
- the temperature was ⁇ 20 ° C.
- the etching time was 120 seconds. As a result, an opening having a smooth side wall was formed.
- An anisotropic shape can be obtained by etching using hydrogen halide. That is, etching can be performed while suppressing the inner wall of the trench or via hole from becoming a bowing shape. However, this etching does not increase the selection ratio with the mask, and therefore the mask may disappear as the etching progresses. Therefore, when etching is performed to a predetermined depth, the etching gas is switched to a fluorine-containing gas.
- the supply of the hydrogen halide-containing gas is stopped by the control device 19 and the control device 20 is operated.
- the hydrogen halide-containing gas is mixed with the rare gas, and these mixed gases are introduced into the vacuum chamber 1.
- the variable capacitor 16 and the high frequency bias power supply 11 are turned off so that the high frequency power is not supplied to the floating electrode 14 and the substrate electrode 8.
- power for generating plasma is supplied from the high frequency power supply 13 to the high frequency antenna coil 12 to etch the silicon substrate 9.
- the etching proceeds by the reaction between fluorine radicals and silicon.
- this etching can provide a large selection ratio with the mask, it is isotropic, so an anisotropic shape cannot be obtained. Therefore, a bowing shape in which the inner walls of the trench and the via hole spread like a bow is generated.
- a protective film is formed on the side wall to protect the side wall from etching.
- the control device 20 when the etching using the fluorine-containing gas is performed for a predetermined time, the supply of the fluorine-containing gas is stopped by the control device 20 so that only the rare gas is supplied into the vacuum chamber 1.
- the variable capacitor 16 is turned on and the output of the high frequency power supply 13 is increased.
- the high frequency power is applied to the floating electrode 14 without supplying the high frequency power to the substrate electrode 8.
- the solid material 15 placed on the floating electrode 14 is sputtered to form a protective film (not shown) on the silicon substrate 9.
- a fluororesin is used as the solid material 15, a fluororesin film is formed on the silicon substrate 9.
- variable capacitor 16 is turned OFF, and the application of the high frequency power to the floating electrode 14 is stopped.
- high frequency bias power supply 11 is turned on to apply high frequency power to the substrate electrode 8.
- the protective film formed on the surface of the silicon substrate 9 and the surface substantially parallel to the surface of the silicon substrate 9 is removed, leaving the sidewalls of the trenches or via holes.
- the control device 20 may be operated to introduce the fluorine-containing gas, but only the rare gas may be introduced without introducing the fluorine-containing gas.
- FIG. 2 is a sequence of a fluorine-containing gas-using etching process, a protective film forming process, and a protective film removing process.
- each process mentioned above is made into 1 cycle, and the timing of 3 cycles is shown.
- signal A is a trigger signal
- signal B is a signal indicating the control timing of the fluorine-containing gas control device 20
- signal C is a signal indicating the control timing of the variable capacitor 16
- signal D is a high-frequency power source.
- 13 indicates a signal indicating the control timing
- signal E indicates a signal indicating the control timing of the high-frequency bias power supply 11.
- the second cycle is performed, and the third cycle is performed. That is, after the first cycle etching ⁇ protection film formation ⁇ protection film removal, the second cycle is entered, and etching using a fluorine-containing gas is performed.
- the silicon substrate can be further etched in the depth direction while preventing the etching to the side wall by the protective film.
- a protective film is formed again on the side wall.
- etching ⁇ protection film formation ⁇ protection film removal is performed in the same manner.
- 3 (a) to 3 (e) are schematic partial cross-sectional views of a silicon substrate, showing each step of the etching method according to the present invention.
- the silicon substrate 102 exposed from the mask 101 is etched to a predetermined depth by etching using hydrogen halide.
- the etching gas is replaced with a fluorine-containing gas, and the silicon substrate 102 is further etched. Thereby, the shape shown in FIG. 3B is obtained.
- a protective film 103 is formed on the silicon substrate 102 as shown in FIG.
- the protective film 103 is formed so as to cover the mask 101 and the inside of the opening 104.
- the protective film 103 formed on the surface of the silicon substrate 102 and a surface substantially parallel to the surface of the silicon substrate 102 is removed leaving the side wall 104a of the opening 104.
- etching using a fluorine-containing gas is performed again, and the silicon substrate 102 is etched further deeply (FIG. 3E).
- the etching process using the hydrogen halide-containing gas after performing the etching process using the hydrogen halide-containing gas, the etching process using the fluorine-containing gas, the protective film forming process, and the protective film removing process are repeated. Thereby, the side walls of the trench and the via hole can be smoothed, and the silicon substrate can be etched in the depth direction. This is considered to be due to the following reason.
- etching by repeating etching using a fluorine-containing gas and forming a protective film on the side wall and proceeding in the depth direction, a high aspect ratio trench or the like can be maintained while maintaining a good shape.
- a via hole can be formed.
- the attack by fluorine radicals to the portion directly under the mask decreases, so that the side wall formed in a smooth shape has irregularities in the etching process using a fluorine-containing gas. There is little risk of becoming a condition.
- etching using a hydrogen halide-containing gas after etching using a hydrogen halide-containing gas, etching using a fluorine-containing gas, formation of a protective film, and removal of the protective film were repeated.
- the present invention is not limited to this.
- etching using a fluorine-containing gas, formation of a protective film, and removal of the protective film may be repeated, and then etching using a hydrogen halide-containing gas may be performed.
- etching using a hydrogen halide-containing gas etching using a fluorine-containing gas, formation of a protective film, and removal of the protective film are repeated, and the hydrogen halide-containing gas is used again.
- the step of repeatedly performing the etching using the fluorine-containing gas, the formation of the protective film, and the removal of the protective film may be repeated.
- etching using a fluorine-containing gas is performed again, and etching using a fluorine-containing gas is performed again.
- the process of repeatedly forming the protective film and removing the protective film and then performing the etching using the hydrogen halide-containing gas may be repeated. In any of the above cases, the effects of the present invention can be obtained.
- the high frequency bias power supply 11 is turned off so that the high frequency power is not supplied to the substrate electrode 8 in FIG. 1 during the etching using the fluorine-containing gas.
- etching using a fluorine-containing gas may be performed while applying high-frequency bias power. According to this method, the etching of the silicon substrate and the removal of the protective film can be performed simultaneously. Therefore, in addition to the effect that the silicon substrate can be etched in the depth direction while smoothing the sidewalls of the trench and via hole, the effect that the total number of steps can be reduced is also obtained.
- a hydrogen halide-containing gas is introduced into the vacuum chamber to etch the silicon substrate, and a solid material placed opposite the silicon substrate is sputtered to form a protective film on the silicon substrate. Then, there is a process of repeatedly introducing a fluorine-containing gas into the vacuum chamber and applying a high frequency bias power to the substrate electrode to etch the silicon substrate while removing a part of the protective film.
- the protective film forming step and the fluorine-containing gas use etching step can be repeated in this order after the hydrogen halide-containing gas use etching step.
- the hydrogen halide-containing gas using etching step can be performed. Furthermore, the hydrogen halide-containing gas using etching step, the protective film forming step, and the fluorine-containing gas using etching step can be alternately performed in this order.
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Abstract
Description
上記の繰り返し工程では、フッ素含有ガス使用エッチング工程、保護膜形成工程および保護膜除去工程がこの順に繰り返されていればよく、フッ素含有ガス使用エッチング工程と保護膜形成工程のいずれが最初であってもよい。
2 プラズマ発生部
3 基板処理部
4 排気口
5,6,7 磁場コイル
8 基板電極
9 シリコン基板
10 ブロッキングコンデンサ
11 高周波バイアス電源
12 高周波アンテナコイル
13 高周波電源
14 浮遊電極
15 固体材料
16 可変コンデンサ
17,18,21 供給路
19,20 制御装置
22 ガス混合部
101 マスク
102 シリコン基板
103 保護膜
104 開孔部
Claims (14)
- 処理室内でプラズマを発生させて、該処理室内に設置された基板電極上のシリコンからなる被処理体をエッチングする方法であって、
前記処理室内にハロゲン化水素含有ガスを導入して前記被処理体をエッチングするハロゲン化水素含有ガス使用エッチング工程と、
前記処理室内にフッ素含有ガスを導入して前記被処理体をエッチングするフッ素含有ガス使用エッチング工程と、
前記被処理体に対向して設置された固体材料をスパッタして、前記被処理体の上に保護膜を形成する保護膜形成工程と、
前記基板電極に高周波バイアス電力を印加して、前記保護膜の一部を除去する保護膜除去工程とを有し、
前記フッ素含有ガス使用エッチング工程、前記保護膜形成工程および前記保護膜除去工程をこの順に繰り返して行うことを特徴とするエッチング方法。 - 前記ハロゲン化水素含有ガス使用エッチング工程を最初に行うことを特徴とする請求項1に記載のエッチング方法。
- 前記ハロゲン化水素含有ガス使用エッチング工程の後に、前記フッ素含有ガス使用エッチング工程、前記保護膜形成工程および前記保護膜除去工程をこの順に繰り返して行うことを特徴とする請求項1に記載のエッチング方法。
- 前記フッ素含有ガス使用エッチング工程、前記保護膜形成工程および前記保護膜除去工程をこの順に繰り返して行ってから、前記ハロゲン化水素含有ガス使用エッチング工程を行うことを特徴とする請求項1に記載のエッチング方法。
- 前記ハロゲン化水素含有ガス使用エッチング工程と、前記フッ素含有ガス使用エッチング工程、前記保護膜形成工程および前記保護膜除去工程をこの順に繰り返して行う工程とを交互に行うことを特徴とする請求項1に記載のエッチング方法。
- 処理室内でプラズマを発生させて、該処理室内に設置された基板電極上のシリコンからなる被処理体をエッチングする方法であって、
前記処理室内にハロゲン化水素含有ガスを導入して前記被処理体をエッチングするハロゲン化水素含有ガス使用エッチング工程と、
前記被処理体に対向して設置された固体材料をスパッタして、前記被処理体の上に保護膜を形成する保護膜形成工程と、
前記処理室内にフッ素含有ガスを導入するとともに前記基板電極に高周波バイアス電力を印加して、前記保護膜の一部を除去しつつ前記被処理体をエッチングするフッ素含有ガス使用エッチング工程とを有し、
前記保護膜形成工程と前記フッ素含有ガス使用エッチング工程をこの順に繰り返して行うことを特徴とするエッチング方法。 - 前記ハロゲン化水素含有ガス使用エッチング工程を最初に行うことを特徴とする請求項6に記載のエッチング方法。
- 前記ハロゲン化水素含有ガス使用エッチング工程の後に、前記保護膜形成工程と前記フッ素含有ガス使用エッチング工程をこの順に繰り返して行うことを特徴とする請求項6に記載のエッチング方法。
- 前記保護膜形成工程と前記フッ素含有ガス使用エッチング工程をこの順に繰り返して行ってから、前記ハロゲン化水素含有ガス使用エッチング工程を行うことを特徴とする請求項6に記載のエッチング方法。
- 前記ハロゲン化水素含有ガス使用エッチング工程と、前記保護膜形成工程と前記フッ素含有ガス使用エッチング工程をこの順に繰り返して行う工程とを交互に行うことを特徴とする請求項6に記載のエッチング方法。
- 前記ハロゲン化水素含有ガスはフッ素を含んでいることを特徴とする請求項1~10のいずれか1項に記載のエッチング方法。
- 前記ハロゲン化水素は、ヨウ化水素、塩化水素および臭化水素よりなる群から選ばれる少なくとも1種であることを特徴とする請求項1~11のいずれか1項に記載のエッチング方法。
- 前記フッ素含有ガスは、六フッ化硫黄ガス、三フッ化窒素ガス、フッ素ガス、四フッ化ケイ素ガス、二フッ化キセノンガス、フッ化ヨウ素ガスおよびヨウ化フロロカーボンガスよりなる群から選ばれる少なくとも1種を含んでいることを特徴とする請求項1~12のいずれか1項に記載のエッチング方法。
- 前記固体材料は、フッ素樹脂、ケイ素、炭素、炭化ケイ素、酸化ケイ素および窒化ケイ素よりなる群から選ばれる材料を用いて構成されることを特徴とする請求項1~13のいずれか1項に記載のエッチング方法。
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EP10808085.4A EP2466627A4 (en) | 2009-08-14 | 2010-08-12 | etching |
CN201080035963.5A CN102473633B (zh) | 2009-08-14 | 2010-08-12 | 蚀刻方法 |
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