JP7145819B2 - エッチング方法 - Google Patents
エッチング方法 Download PDFInfo
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- JP7145819B2 JP7145819B2 JP2019116471A JP2019116471A JP7145819B2 JP 7145819 B2 JP7145819 B2 JP 7145819B2 JP 2019116471 A JP2019116471 A JP 2019116471A JP 2019116471 A JP2019116471 A JP 2019116471A JP 7145819 B2 JP7145819 B2 JP 7145819B2
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- gas
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- etching
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- etching method
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- 238000005530 etching Methods 0.000 title claims description 93
- 238000000034 method Methods 0.000 title claims description 68
- 239000000758 substrate Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 229910052743 krypton Inorganic materials 0.000 claims description 8
- 229910052724 xenon Inorganic materials 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims description 5
- 229910052682 stishovite Inorganic materials 0.000 claims description 5
- 229910052905 tridymite Inorganic materials 0.000 claims description 5
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052704 radon Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- IGELFKKMDLGCJO-UHFFFAOYSA-N xenon difluoride Chemical compound F[Xe]F IGELFKKMDLGCJO-UHFFFAOYSA-N 0.000 claims description 3
- ARUUTJKURHLAMI-UHFFFAOYSA-N xenon hexafluoride Chemical compound F[Xe](F)(F)(F)(F)F ARUUTJKURHLAMI-UHFFFAOYSA-N 0.000 claims description 3
- RPSSQXXJRBEGEE-UHFFFAOYSA-N xenon tetrafluoride Chemical compound F[Xe](F)(F)F RPSSQXXJRBEGEE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- QGOSZQZQVQAYFS-UHFFFAOYSA-N krypton difluoride Chemical compound F[Kr]F QGOSZQZQVQAYFS-UHFFFAOYSA-N 0.000 claims 1
- 239000007789 gas Substances 0.000 description 163
- 238000009792 diffusion process Methods 0.000 description 19
- 239000002826 coolant Substances 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 6
- 239000013626 chemical specie Substances 0.000 description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910003481 amorphous carbon Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229940070337 ammonium silicofluoride Drugs 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000010849 ion bombardment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- UAJUXJSXCLUTNU-UHFFFAOYSA-N pranlukast Chemical compound C=1C=C(OCCCCC=2C=CC=CC=2)C=CC=1C(=O)NC(C=1)=CC=C(C(C=2)=O)C=1OC=2C=1N=NNN=1 UAJUXJSXCLUTNU-UHFFFAOYSA-N 0.000 description 1
- 229960004583 pranlukast Drugs 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
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- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0337—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
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- 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
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Description
図1は、本実施形態に係るエッチング装置の一例を示す縦断面図である。図1に示すエッチング装置10は、容量結合型プラズマ処理装置である。エッチング装置10は、チャンバ1と排気装置2とゲートバルブ3とを備えている。チャンバ1は、例えばアルミニウムから形成されている。チャンバ1は、円筒形に形成され、表面がアルマイト処理(陽極酸化処理)されている。チャンバ1は、電気的に接地されている。チャンバ1の内部には、処理空間5が形成されている。チャンバ1は、処理空間5を外部の雰囲気から隔離している。チャンバ1には、排気口6と開口部7とがさらに形成されている。排気口6は、チャンバ1の底面に形成されている。開口部7は、チャンバ1の側壁に形成されている。排気装置2は、排気口6を介してチャンバ1の処理空間5に接続されている。排気装置2は、排気口6を介して処理空間5から気体を排気する。ゲートバルブ3は、開口部7を開放したり、開口部7を閉鎖したりする。
図2は、本実施形態に係るエッチング装置によってエッチングされるウェハの構造の一例を示す図である。
次に、本実施形態に係るエッチング方法について説明する。図3は、本実施形態に係るエッチング方法の一例を示すフローチャートである。
チャンバ1内の圧力:3.333Pa(25mTorr)
第1高周波の電力(40MHz):4.9kW
第2高周波の電力(400kHz):7.04kW
処理ガス(第1のガス):C4F8、H2及びXeを含む混合ガス
処理ガス(第2のガス):H2及びO2を含む混合ガス
ウェハの温度:-60℃
5 処理空間
8 載置台
10 エッチング装置
11 支持台
12 静電チャック
21 チラー
27 ウェハ
31 ガスシャワーヘッド
37 処理ガス供給源
41 電力供給装置
42 第1高周波電源
44 第2高周波電源
50 制御部
201 シリコン基板
202 第1の膜
203 マスク
Claims (12)
- エッチング方法であって、
第1の膜の上に形成されたマスクを有する基板を準備する工程と、
第1のガスより生成されたプラズマにて、前記マスクを介して前記第1の膜をエッチングする工程と、
第2のガスより生成されたプラズマにて、前記第1のガスより生成されたプラズマによって生じた前記マスクの開口部の変形部分を削ることにより、前記マスクの形状を補正する工程と、を含み、
前記第1のガスはXe、Kr又はRnを含む、
エッチング方法。 - エッチング方法であって、
第1の膜の上に形成されたマスクを有する基板を準備する工程と、
第1のガスより生成されたプラズマにて、前記マスクを介して前記第1の膜をエッチングする工程と、
第2のガスより生成されたプラズマにて、前記マスクの形状を補正する工程と、を含み、
前記第1のガスはXe、Kr又はRnを含み、
前記第2のガスは、O 2 、N 2 、CO 2 、CO、N 2 O、NF 3 、NH 3 、NO、H 2 及びCl 2 のうち少なくともいずれか1つを含む、
エッチング方法。 - 前記第2のガスは、O 2 、N 2 、CO 2 、CO、N 2 O、NF 3 、NH 3 、NO、H 2 及びCl 2 のうち少なくともいずれか1つを含む、
請求項1に記載のエッチング方法。 - 前記第1の膜は、ナイトライドを含む膜である、
請求項1~3のいずれか1つに記載のエッチング方法。 - 前記第1の膜は、Si3N4及びSiO2のうち少なくともいずれか1つを含む膜である、
請求項1~3のいずれか1つに記載のエッチング方法。 - 前記補正する工程は、前記エッチングする工程の後に実行される、
請求項1~5のいずれか1つに記載のエッチング方法。 - 前記補正する工程は、前記エッチングする工程と同時に実行される、
請求項1~5のいずれか1つに記載のエッチング方法。 - 前記エッチングする工程と前記補正する工程とは、少なくとも1回以上交互に繰り返される、
請求項1~5のいずれか1つに記載のエッチング方法。 - 前記第1のガスは、Xe、XeF2、XeF4、XeF6、XeO4、XeOx、XeO2、XeOxYy、XeOxFy、XeCl2、HXeOXeH、XeH2、Kr、KrF2、Rn及びRnF2のうち少なくともいずれか1つを含む、
請求項1~8のいずれか1つに記載のエッチング方法。 - 前記マスクは、C、W、Ti、TiN、TiO2又はWCである、
請求項1~9のいずれか1つに記載のエッチング方法。 - 前記エッチングする工程及び前記補正する工程は、前記第1の膜を含む前記基板の温度が-70℃~100℃の範囲の条件で実行される、
請求項1~10のいずれか1つに記載のエッチング方法。 - 前記エッチングする工程により前記第1の膜に形成されるホール又は溝のアスペクト比が30以上である、
請求項1~11のいずれか1つに記載のエッチング方法。
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