JPWO2013035510A1 - プラズマエッチング方法 - Google Patents
プラズマエッチング方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 87
- 238000001020 plasma etching Methods 0.000 title claims abstract description 40
- 238000005530 etching Methods 0.000 claims abstract description 292
- 239000000758 substrate Substances 0.000 claims abstract description 188
- 239000004065 semiconductor Substances 0.000 claims abstract description 85
- 238000005513 bias potential Methods 0.000 claims abstract description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 100
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 100
- 239000007789 gas Substances 0.000 claims description 88
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 30
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 30
- 230000015572 biosynthetic process Effects 0.000 claims description 28
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 19
- 239000010936 titanium Substances 0.000 claims description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 10
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 8
- 229920005591 polysilicon Polymers 0.000 claims description 7
- 238000007740 vapor deposition Methods 0.000 claims description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 6
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000011737 fluorine Substances 0.000 claims description 6
- WQJQOUPTWCFRMM-UHFFFAOYSA-N tungsten disilicide Chemical compound [Si]#[W]#[Si] WQJQOUPTWCFRMM-UHFFFAOYSA-N 0.000 claims description 6
- 229910021342 tungsten silicide Inorganic materials 0.000 claims description 6
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 5
- 239000000470 constituent Substances 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims 2
- 239000000463 material Substances 0.000 description 16
- 239000011261 inert gas Substances 0.000 description 15
- 150000002500 ions Chemical class 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000005240 physical vapour deposition Methods 0.000 description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 3
- FFBGYFUYJVKRNV-UHFFFAOYSA-N boranylidynephosphane Chemical compound P#B FFBGYFUYJVKRNV-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000002210 silicon-based material Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 2
- 229910020776 SixNy Inorganic materials 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 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
- 229910052799 carbon Inorganic materials 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- -1 is an etching target Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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Abstract
Description
プラズマ化した反応性エッチングガスを用いて、処理チャンバ内に配置された基台上に載置されるワイドギャップ半導体基板をプラズマエッチングする方法であって、
前記反応性エッチングガスをプラズマ化して生成される反応種により、前記ワイドギャップ半導体基板の構成成分よりも速い速度でエッチングされる成分からなる高速エッチング膜を、前記ワイドギャップ半導体基板の表面に形成する成膜工程と、
前記ワイドギャップ半導体基板の表面に形成した高速エッチング膜上に、開口部を有するマスクを形成するマスク形成工程と、
前記ワイドギャップ半導体基板を前記処理チャンバ内の基台上に載置して、該ワイドギャップ半導体基板を200℃以上に加熱し、前記反応性エッチングガスを前記処理チャンバ内に供給してプラズマ化するとともに、前記ワイドギャップ半導体基板が載置された基台にバイアス電位を印加して、前記プラズマ化した反応性エッチングガスによって、前記開口部を通して前記高速エッチング膜及び前記ワイドギャップ半導体基板をエッチングするエッチング工程とを行うようにしたことを特徴とするプラズマエッチング方法に係る。
以下、本発明の具体的な実施形態について、添付図面に基づき説明する。尚、本実施形態においては、エッチング装置1によって、ワイドギャップ半導体基板の1つである炭化ケイ素基板Kをプラズマエッチングする場合を一例に挙げて説明する。また、この炭化ケイ素基板Kは、例えば、4H−SiCの結晶構造を持つものであるものとする。
次に、本発明の更なる実施形態について説明する。ここでは、高速エッチング膜Eの成膜条件を変化させることによって、エッチング時における側壁のテーパ角度を制御できることを説明する。
次に、本発明の更なる実施形態について説明する。ここでは、高速エッチング膜Eの膜厚条件を変化させることによって、エッチング時における側壁のテーパ角度を制御できることを説明する。
11 処理チャンバ
15 基台
20 ガス供給装置
21 エッチングガス供給部
22 不活性ガス供給部
25 プラズマ生成装置
26 コイル
27 高周波電源
30 高周波電源
35 排気装置
K 炭化ケイ素基板(ワイドギャップ半導体基板)
M マスク
E 高速エッチング膜
プラズマ化した反応性エッチングガスを用いて、処理チャンバ内に配置された基台上に載置されるワイドギャップ半導体基板をプラズマエッチングする方法であって、
前記反応性エッチングガスをプラズマ化して生成される反応種により、前記ワイドギャップ半導体基板の構成成分よりも速い速度でエッチングされる成分からなる高速エッチング膜を、前記ワイドギャップ半導体基板の表面に蒸着法によって形成する成膜工程と、
前記ワイドギャップ半導体基板の表面に形成した高速エッチング膜上に、開口部を有するマスクを形成するマスク形成工程と、
前記ワイドギャップ半導体基板を前記処理チャンバ内の基台上に載置して、前記反応性エッチングガスを前記処理チャンバ内に供給してプラズマ化するとともに、前記ワイドギャップ半導体基板が載置された基台にバイアス電位を印加して、前記プラズマ化した反応性エッチングガスによって、前記開口部を通して前記高速エッチング膜及び前記ワイドギャップ半導体基板をエッチングするエッチング工程とを行うようにしたことを特徴とするプラズマエッチング方法に係る。
Claims (9)
- プラズマ化した反応性エッチングガスを用いて、処理チャンバ内に配置された基台上に載置されるワイドギャップ半導体基板をプラズマエッチングする方法であって、
前記反応性エッチングガスをプラズマ化して生成される反応種により、前記ワイドギャップ半導体基板の構成成分よりも速い速度でエッチングされる成分からなる高速エッチング膜を、前記ワイドギャップ半導体基板の表面に形成する成膜工程と、
前記ワイドギャップ半導体基板の表面に形成した高速エッチング膜上に、開口部を有するマスクを形成するマスク形成工程と、
前記ワイドギャップ半導体基板を前記処理チャンバ内の基台上に載置して、該ワイドギャップ半導体基板を200℃以上に加熱し、前記反応性エッチングガスを前記処理チャンバ内に供給してプラズマ化するとともに、前記ワイドギャップ半導体基板が載置された基台にバイアス電位を印加して、前記プラズマ化した反応性エッチングガスによって、前記開口部を通して前記高速エッチング膜及び前記ワイドギャップ半導体基板をエッチングするエッチング工程とを行うようにしたことを特徴とするプラズマエッチング方法。 - 前記高速エッチング膜は、チタン、窒化チタン、アモルファスシリコン、ポリシリコン、タングステンシリサイド、窒化シリコンのうちの少なくとも一つから構成されることを特徴とする請求項1記載のプラズマエッチング方法。
- 前記ワイドギャップ半導体基板は、炭化ケイ素から構成された基板であることを特徴とする請求項1記載のプラズマエッチング方法。
- 前記反応性エッチングガスは、フッ素系ガスであることを特徴とする請求項1記載のプラズマエッチング方法。
- 前記成膜工程は蒸着法によって実施され、前記高速エッチング膜は、前記エッチング工程で形成すべきエッチング構造側壁面の底面に対する角度に応じて設定された成膜条件で成膜されることを特徴とする請求項1乃至4に記載のいずれかのプラズマエッチング方法。
- 前記成膜条件は、処理チャンバ内への成膜用原料ガスの供給流量、処理チャンバ内へのキャリアガスの供給流量、処理チャンバ内の圧力、電極への印加電力のうち、少なくとも一つを含むことを特徴とする請求項5記載のプラズマエッチング方法。
- 前記高速エッチング膜は、アモルファスシリコン、ポリシリコン、タングステンシリサイド、窒化シリコンのうちの少なくとも一つから構成され、
前記成膜工程は蒸着法によって実施されるとともに、前記高速エッチング膜は、該高速エッチング膜が予め設定した屈折率を備えたものとなるように設定された成膜条件で成膜されることを特徴とする請求項1、3又は4に記載のいずれかのプラズマエッチング方法。 - 前記成膜条件は、処理チャンバ内への成膜用原料ガスの供給流量、処理チャンバ内へのキャリアガスの供給流量、処理チャンバ内の圧力、電極への印加電力のうち、少なくとも一つを含むことを特徴とする請求項7記載のプラズマエッチング方法。
- 前記成膜工程は蒸着法によって実施され、前記高速エッチング膜は、前記エッチング工程で形成すべきエッチング構造側壁面の底面に対する角度に応じて設定された膜厚となるように成膜されることを特徴とする請求項1乃至4に記載のいずれかのプラズマエッチング方法。
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