WO2023067786A1 - プラズマ処理方法 - Google Patents
プラズマ処理方法 Download PDFInfo
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- WO2023067786A1 WO2023067786A1 PCT/JP2021/039032 JP2021039032W WO2023067786A1 WO 2023067786 A1 WO2023067786 A1 WO 2023067786A1 JP 2021039032 W JP2021039032 W JP 2021039032W WO 2023067786 A1 WO2023067786 A1 WO 2023067786A1
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- 238000003672 processing method Methods 0.000 title claims abstract description 18
- 238000005530 etching Methods 0.000 claims abstract description 46
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims abstract description 44
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(IV) oxide Inorganic materials O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910003910 SiCl4 Inorganic materials 0.000 claims abstract description 13
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910015844 BCl3 Inorganic materials 0.000 claims abstract description 10
- 229910003902 SiCl 4 Inorganic materials 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 8
- 238000001020 plasma etching Methods 0.000 claims description 4
- 238000009832 plasma treatment Methods 0.000 claims 2
- 229910003978 SiClx Inorganic materials 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 53
- 150000002500 ions Chemical class 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910000449 hafnium oxide Inorganic materials 0.000 description 7
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 7
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 239000005049 silicon tetrachloride Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000006557 surface reaction Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- OQNXPQOQCWVVHP-UHFFFAOYSA-N [Si].O=[Ge] Chemical compound [Si].O=[Ge] OQNXPQOQCWVVHP-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002070 nanowire Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- -1 that is Inorganic materials 0.000 description 1
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- H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02175—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal
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Definitions
- the present invention relates to a plasma processing method.
- Lithographic technology is usually used to form fine patterns in the manufacturing process of semiconductor devices. This technique applies a pattern of device structures onto a resist layer and selectively etches away the substrate exposed by the pattern of the resist layer. Subsequent processing steps can deposit other materials in the etched regions to form an integrated circuit.
- anisotropic etching is etching that utilizes an ion-assisted reaction in which ions promote reactions of radicals
- isotropic etching is etching that mainly involves surface reactions only by radicals.
- Patent Document 1 discloses that at least one of a non-reactive gas such as argon, an oxygen atom-supplying gas such as oxygen, and an oxidizing gas such as nitrogen oxide is activated in a remote plasma generator.
- a gas containing active species is introduced into a chamber together with a halogen-based gas such as boron trichloride BCl 3 .
- Patent Document 2 proposes a technique of etching HfO 2 with plasma generated from an etching gas mixture containing a halogen-containing gas.
- the plasma processing method for laterally etching hafnium oxide HfO 2 using a vacuum processing apparatus capable of radical etching for the manufacture of next-generation three-dimensional structure devices such as GAA Silicon tetrachloride SiCl4 gas is added to boron trichloride BCl3 gas, at this time the flow rate of silicon tetrachloride SiCl4 gas is lower than the flow rate of boron trichloride BCl3 gas, and the silicon germanium oxide is higher than that of hafnium oxide HfO2 This is achieved by selectively etching hafnium oxide HfO 2 with respect to silicon germanium SiGe at a flow rate that results in more SiCl x deposition on SiGe.
- FIG. 1 is a cross-sectional view of a schematic overall configuration of a vacuum processing apparatus according to a first embodiment of the present invention.
- FIG. 2 is a plan view showing the shielding plate according to the first embodiment of the invention.
- FIG. 3 is a graph showing the dependence of the etching rate of HfO 2 and SiGe on the flow rate ratio of SiCl 4 gas in a mixed gas system of BCl 3 gas and SiCl 4 gas according to the first embodiment of the present invention.
- FIG. 4 is a graph showing the dependence of the etching rate selectivity of HfO 2 to SiGe on the flow rate ratio of SiCl 4 gas in a mixed gas system of BCl 3 gas and SiCl 4 gas according to the first embodiment of the present invention.
- FIG. 1 is a cross-sectional view of a schematic overall configuration of a vacuum processing apparatus according to a first embodiment of the present invention.
- FIG. 2 is a plan view showing the shielding plate according to the first embodiment of the invention.
- FIG. 1 shows a schematic overall configuration cross-sectional view of a vacuum processing apparatus according to the first embodiment of the present invention.
- microwaves of 2.45 GHz supplied from a magnetron 103, which is a high-frequency power supply, to a vacuum processing chamber 117 through a dielectric window 111 and a magnetic field generated by a solenoid coil 108, which is a magnetic field forming mechanism, are combined.
- Plasma can be generated in the vacuum processing chamber 117 by electron cyclotron resonance (ECR).
- ECR electron cyclotron resonance
- a high-frequency power supply 124 is connected to the sample 116 placed on the sample table 115 via a matching device 123 .
- the inside of the vacuum processing chamber 117 is connected to a pump 122 via a valve 121, and the internal pressure can be adjusted by the degree of opening of the valve 121.
- This vacuum processing apparatus also has a quartz shielding plate 113 shown in FIG. 2 inside the vacuum processing chamber 117 .
- Through-holes 131 having the same diameter are uniformly arranged in the shielding plate 113 along the outer peripheral portion thereof.
- the term “uniform” means that when concentric circles having the same diameter difference (including cases where the radius is zero) are drawn, the through holes 131 having center points on the same circle are arranged at equal pitches in the circumferential direction. It means that it is placed.
- a shielding plate 113 divides the interior of the vacuum processing chamber 117 into a first space 118 and a second space 119 , and a pressure gauge 125 is connected to the second space 119 .
- the plasma processing apparatus used in this embodiment has the characteristic of being able to generate plasma near a plane with a magnetic field strength of 0.0875 T when the microwave frequency is 2.45 GHz. Therefore, by adjusting the magnetic field so that the plasma generation region is positioned between the shield plate 113 and the dielectric window 111 (first space 118), plasma can be generated on the dielectric window 111 side of the shield plate 113. Since the generated ions can hardly pass through the shielding plate 113, the sample 116 can be irradiated only with radicals. At this time, in the sample 116, isotropic etching mainly due to surface reaction only by radicals proceeds.
- the magnetic field is adjusted so that the plasma generation region is positioned between the shield plate 113 and the sample 116 (second space 119), plasma can be generated on the sample 116 side of the shield plate 113, and ions and radicals can be generated. can be supplied to the sample 116.
- the sample 116 undergoes anisotropic etching using an ion-assisted reaction, in which the ions accelerate the reaction of radicals.
- the control device 120 is used to adjust or switch the height position of the plasma generation region with respect to the height position of the shielding plate 113 (upper or lower), and to adjust the period for holding each height position. can be done.
- the magnetic field is adjusted so that the plasma generation region is positioned between the shielding plate 113 and the dielectric window 111 (first space 118), and the surface reaction is mainly caused by radicals alone.
- the specimen 116 is laterally etched with an isotropic etch.
- a mixed gas of boron trichloride BCl 3 gas and silicon tetrachloride SiCl 4 gas is introduced into the vacuum processing chamber 117 to generate plasma. Etching progresses by reaching the sample 116 through the through holes 131 arranged in the .
- the etching rate when the sample 116 is hafnium oxide HfO2 is higher than the etching rate when the sample 116 is silicon germanium SiGe, that is, HfO2 is selectively etched with respect to SiGe.
- Adjust the flow ratio of BCl3 gas and SiCl4 gas so that The sample 116 is a semiconductor manufacturing substrate used for manufacturing next-generation three-dimensional devices such as GAA (Gate All Around).
- GAA Gate All Around
- the HfO 2 is etched in the direction perpendicular to the SiGe stacking direction. Therefore, when a plurality of SiGe layers are stacked in the vertical direction, which is the vertical direction with respect to the horizontal surface of the semiconductor substrate as the sample 116, the lateral direction (that is, the horizontal direction ) .
- FIG. 3 is a graph showing the dependence of the etching rate of HfO 2 and SiGe on the flow rate ratio of SiCl 4 gas in a mixed gas system of BCl 3 gas and SiCl 4 gas according to the first embodiment of the present invention.
- the flow rate of SiCl 4 gas is 0%, that is, etching is performed only with BCl 3 gas, the etching rate of SiGe is higher than that of HfO 2 , and HfO 2 cannot be selectively etched with respect to SiGe. Then, by adding SiCl 4 gas, if the flow rate of SiCl 4 gas is set to 3% or more, the etching rate of HfO 2 becomes higher than that of SiGe. Selective etching becomes possible. That is, a mixed gas of BCl3 gas and SiCl4 gas is used to etch HfO2 .
- the flow rate of SiCl 4 gas is preferably lower than the flow rate of BCl 3 gas. Furthermore, when the flow rate of SiCl 4 gas is increased, SiCl x deposition accumulates and inhibits etching, so the etching rate of both HfO 2 and SiGe decreases.
- FIG. 3 is a graph up to a SiCl 4 flow rate of up to about 17%.
- 2 has a higher etching rate than SiGe, and when the flow rate of SiCl 4 becomes 20% or more, the etching rate of HfO 2 becomes negative, and it is assumed that the etching does not progress. Therefore, in the BCl 3 +SiCl 4 gas system, HfO 2 can be selectively etched with respect to SiGe by setting the flow ratio of SiCl 4 gas to a value within the range of 3 to 20%.
- the ratio of the flow rate of SiCl4 gas to the flow rate of the mixed gas is the value at which the thickness of the deposited film of SiClx deposited on SiGe is thicker than the thickness of the deposited film of SiClx deposited on HfO2 . be able to.
- the pressure in the second space 119 within the vacuum processing chamber 117 is 1 to 8 mTorr, and the temperature of the sample stage 115 on which the sample 116 is placed is 50° C. or higher.
- FIG. 4 is a graph showing the dependence of the etching rate selectivity of HfO 2 to SiGe on the flow rate ratio of SiCl 4 gas in a mixed gas system of BCl 3 gas and SiCl 4 gas according to the first embodiment of the present invention.
- the selectivity is obtained by dividing the etching rate of HfO 2 by the etching rate of SiGe.
- the line where the etching rate selection ratio of HfO 2 to SiGe is 1 is indicated by a dashed line, and when this selection ratio is 1 or more, HfO 2 can be selectively etched with respect to SiGe.
- FIG . 4 is a graph when the flow rate of SiCl 4 gas is up to about 17%. can be selectively etched against
- the present invention provides a plasma processing method for selectively plasma-etching HfO2 , which is a gate insulating film of a Gate All Around structure, with respect to SiGe, and a plasma processing method for plasma-etching HfO2 selectively with respect to SiGe. It is possible to use
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Abstract
Description
三塩化ホウ素BCl3ガスに四塩化ケイ素SiCl4ガスを添加し、この時の四塩化ケイ素SiCl4ガスの流量割合が三塩化ホウ素BCl3ガスの流量割合より低く、酸化ハフニウムHfO2よりもシリコンゲルマニウムSiGe上に堆積するSiClxデポジションが多くなる流量割合とすることで、酸化ハフニウムHfO2をシリコンゲルマニウムSiGeに対して選択的にエッチングすることにより達成される。
図1は、本発明の第1の実施形態に係る真空処理装置の概略全体構成断面図である。図2は、本発明の第1の実施形態に係る遮蔽板を示す平面図である。
Claims (6)
- Gate All Around構造のゲート絶縁膜であるHfO2をSiGeに対して選択的にプラズマエッチングするプラズマ処理方法において、
BCl3ガスとSiCl4ガスの混合ガスを用いて前記HfO2をエッチングし、
前記SiCl4ガスの流量は、前記BCl3ガスの流量より少ないことを特徴とするプラズマ処理方法。 - 請求項1に記載のプラズマ処理方法において、
前記SiGeが積層された方向の垂直方向に前記HfO2をエッチングすることを特徴とするプラズマ処理方法。 - 請求項1に記載のプラズマ処理方法において、
前記混合ガスの流量に対する前記SiCl4ガスの流量の比は、前記SiGe上に堆積する堆積膜の厚さが前記HfO2上に堆積する堆積膜の厚さより厚くなる値であることを特徴とするプラズマ処理方法。 - 請求項2に記載のプラズマ処理方法において、
前記混合ガスの流量に対する前記SiCl4ガスの流量の比は、前記SiGe上に堆積する堆積膜の厚さが前記HfO2上に堆積する堆積膜の厚さより厚くなる値であることを特徴とするプラズマ処理方法。 - 請求項4に記載のプラズマ処理方法において、
前記混合ガスの流量に対する前記SiCl4ガスの流量の比は、3~20%の範囲内の値であることを特徴とするプラズマ処理方法。 - SiGeに対して選択的にHfO2をプラズマエッチングするプラズマ処理方法において、
BCl3ガスとSiCl4ガスの混合ガスを用いて前記HfO2をエッチングし、
前記SiCl4ガスの流量は、前記BCl3ガスの流量より少ないことを特徴とするプラズマ処理方法。
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CN202180009904.9A CN116391247A (zh) | 2021-10-22 | 2021-10-22 | 等离子处理方法 |
PCT/JP2021/039032 WO2023067786A1 (ja) | 2021-10-22 | 2021-10-22 | プラズマ処理方法 |
KR1020227023721A KR20230058309A (ko) | 2021-10-22 | 2021-10-22 | 플라스마 처리 방법 |
JP2022552366A JP7446456B2 (ja) | 2021-10-22 | 2021-10-22 | プラズマ処理方法 |
US17/908,177 US20240194489A1 (en) | 2021-10-22 | 2021-10-22 | Plasma processing method |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008060171A (ja) * | 2006-08-29 | 2008-03-13 | Taiyo Nippon Sanso Corp | 半導体処理装置のクリーニング方法 |
JP2009016611A (ja) * | 2007-07-05 | 2009-01-22 | Hitachi High-Technologies Corp | プラズマエッチング処理方法 |
WO2012070551A1 (ja) * | 2010-11-22 | 2012-05-31 | 株式会社アルバック | メモリ素子の製造装置及び製造方法 |
JP2015057854A (ja) * | 2014-11-27 | 2015-03-26 | 株式会社日立ハイテクノロジーズ | プラズマ処理方法 |
US20180175035A1 (en) * | 2016-12-16 | 2018-06-21 | Samsung Electronics Co., Ltd. | Semiconductor devices and method of manufacutring the same |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006339523A (ja) | 2005-06-03 | 2006-12-14 | Taiyo Nippon Sanso Corp | 半導体処理装置のクリーニング方法および高誘電率酸化膜のエッチング方法 |
JP2009021584A (ja) | 2007-06-27 | 2009-01-29 | Applied Materials Inc | 高k材料ゲート構造の高温エッチング方法 |
JP2009076711A (ja) * | 2007-09-21 | 2009-04-09 | Hitachi High-Technologies Corp | 半導体装置の製造方法 |
FR3017241B1 (fr) * | 2014-01-31 | 2017-08-25 | Commissariat Energie Atomique | Procede de gravure plasma |
US9853101B2 (en) * | 2015-10-07 | 2017-12-26 | Taiwan Semiconductor Manufacturing Company, Ltd. | Strained nanowire CMOS device and method of forming |
US10497567B2 (en) * | 2017-08-07 | 2019-12-03 | Applied Materials, Inc. | Method of enhanced selectivity of hard mask using plasma treatments |
US10468527B2 (en) * | 2017-11-15 | 2019-11-05 | Taiwan Semiconductor Manufacturing Co., Ltd. | Metal gate structure and methods of fabricating thereof |
US11527534B2 (en) * | 2021-01-06 | 2022-12-13 | Taiwan Semiconductor Manufacturing Company, Ltd. | Gap-insulated semiconductor device |
US12108596B2 (en) * | 2021-10-18 | 2024-10-01 | Taiwan Semiconductor Manufacturing Company, Ltd. | Semiconductor memory devices having cup shaped vias |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008060171A (ja) * | 2006-08-29 | 2008-03-13 | Taiyo Nippon Sanso Corp | 半導体処理装置のクリーニング方法 |
JP2009016611A (ja) * | 2007-07-05 | 2009-01-22 | Hitachi High-Technologies Corp | プラズマエッチング処理方法 |
WO2012070551A1 (ja) * | 2010-11-22 | 2012-05-31 | 株式会社アルバック | メモリ素子の製造装置及び製造方法 |
JP2015057854A (ja) * | 2014-11-27 | 2015-03-26 | 株式会社日立ハイテクノロジーズ | プラズマ処理方法 |
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