JP5830275B2 - 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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- JP5830275B2 JP5830275B2 JP2011133482A JP2011133482A JP5830275B2 JP 5830275 B2 JP5830275 B2 JP 5830275B2 JP 2011133482 A JP2011133482 A JP 2011133482A JP 2011133482 A JP2011133482 A JP 2011133482A JP 5830275 B2 JP5830275 B2 JP 5830275B2
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- 238000000034 method Methods 0.000 title claims description 75
- 238000001020 plasma etching Methods 0.000 title claims description 66
- 239000007789 gas Substances 0.000 claims description 176
- 238000005530 etching Methods 0.000 claims description 171
- 229910052710 silicon Inorganic materials 0.000 claims description 80
- 239000010703 silicon Substances 0.000 claims description 80
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 79
- 230000001681 protective effect Effects 0.000 claims description 79
- 238000000151 deposition Methods 0.000 claims description 54
- 239000000758 substrate Substances 0.000 claims description 47
- 230000008021 deposition Effects 0.000 claims description 43
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 23
- 229910001882 dioxygen Inorganic materials 0.000 claims description 23
- 239000001301 oxygen Substances 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 17
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 17
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 239000010410 layer Substances 0.000 description 85
- 230000000052 comparative effect Effects 0.000 description 23
- 239000004065 semiconductor Substances 0.000 description 13
- 230000007423 decrease Effects 0.000 description 12
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 8
- 229910052581 Si3N4 Inorganic materials 0.000 description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 7
- 238000001636 atomic emission spectroscopy Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 150000002222 fluorine compounds Chemical class 0.000 description 3
- 238000004020 luminiscence type Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004380 ashing Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
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Description
(第1の実施の形態)
始めに、本発明の第1の実施の形態に係るプラズマエッチング方法について説明する。
4F*+Si→SiF4 (1)
に示すように、フッ素ラジカルF*がSiと反応することによってSiF4が生成される。そして、生成されたSiF4が穴部51aの外へ排出されることにより、シリコン層51がエッチングされる。
O*+SiFx*→SiOFx (2)
に示すように、酸素ラジカルO*がフッ化シリコンのラジカルSiFx*と反応することによって、SiO系の保護膜55(例えばSiOFx)が堆積する。
P=I・V (3)
に示される。また、プラズマ電流Iはプラズマ密度に略比例すると考えられる。すると、供給される高周波電力Pが一定のとき、プラズマ密度の増加に伴って、プラズマ電流Iが増加し、自己バイアス電圧Vが減少する。
(第2の実施の形態)
次に、本発明の第2の実施の形態に係るプラズマエッチング方法について説明する。
2 サセプタ
4 支持部
15 第1の高周波電源
20 シャワーヘッド
23 エッチングガス供給系
24 ダイポールリング磁石
26 第2の高周波電源
35 SF6ガス源
36 O2ガス源
40 制御部
51 基体(シリコン層)
51a 穴部
51b 側壁
54 マスク膜(レジスト層)
55 保護膜
Claims (5)
- シリコン層よりなるとともに、前記シリコン層の上方に、所定のパターンにパターニングされたレジスト層が形成されてなる被処理基板が設置されている処理容器内に、酸素ガスとフッ化硫黄ガスとを含んだエッチングガスを所定の流量で供給し、供給した前記エッチングガスをプラズマ化したプラズマにより、前記レジスト層をマスクとして前記シリコン層をエッチングするプラズマエッチング方法において、
フッ化硫黄ガスの流量に対する酸素ガスの流量の流量比を第1の流量比とした状態で、前記シリコン層をエッチングする第1のステップと、
前記流量比が前記第1の流量比から前記第1の流量比よりも小さい第2の流量比になるように、酸素ガスの流量を減少させながら前記シリコン層をエッチングする第2のステップと、
前記流量比を前記第2の流量比とした状態で、前記シリコン層をエッチングする第3のステップと
を有し、
前記第1のステップから前記第3のステップのいずれも、前記流量比を前記第1の流量比としたときに、前記エッチングガスをプラズマ化したプラズマを前記レジスト層と反応させることで前記被処理基板の表面に保護膜を堆積させる堆積速度と、前記保護膜をエッチングするエッチング速度とが等しくなるような所定磁界よりも大きな第1の磁界を、前記被処理基板に印加した状態で、前記シリコン層をエッチングするものである、プラズマエッチング方法。 - シリコン層よりなるとともに、前記シリコン層の上方に、所定のパターンにパターニングされたレジスト層が形成されてなる被処理基板が設置されている処理容器内に、酸素ガスとフッ化硫黄ガスとを含んだエッチングガスを所定の流量で供給し、供給した前記エッチングガスをプラズマ化したプラズマにより、前記レジスト層をマスクとして前記シリコン層をエッチングして穴部を形成するプラズマエッチング方法において、
フッ化硫黄ガスの流量に対する酸素ガスの流量の流量比を第1の流量比とした状態で、前記シリコン層をエッチングする第1のステップと、
前記流量比が前記第1の流量比から前記第1の流量比よりも小さい第2の流量比になるように、酸素ガスの流量を減少させながら前記シリコン層をエッチングする第2のステップと、
前記流量比を前記第2の流量比とした状態で、前記シリコン層をエッチングする第3のステップと
を有し、
前記第1のステップから前記第3のステップのいずれも、前記流量比を前記第1の流量比としたときに、前記エッチングガスをプラズマ化して発生させた酸素ラジカルを前記レジスト層と反応させることで前記レジスト層の表面及び形成される前記穴部の側壁に保護膜を堆積させる堆積速度と、前記保護膜をエッチングするエッチング速度とが等しくなるような所定磁界よりも大きな第1の磁界を、前記被処理基板に印加した状態で、前記シリコン層をエッチングするものである、プラズマエッチング方法。 - 前記プラズマエッチング方法は、前記処理容器内で前記被処理基板を支持する支持部に第1の周波数を有する第1の高周波電力を供給した状態で、前記シリコン層をエッチングするものであり、
前記第1のステップは、
前記支持部に、前記第1の高周波電力を供給するとともに、前記第1の周波数よりも低い第2の周波数を有する第2の高周波電力を供給した状態で、前記シリコン層をエッチングする第4のステップと、
前記第4のステップの後、前記支持部への前記第2の高周波電力の供給を停止するとともに、前記支持部に前記第1の高周波電力を供給した状態で、前記シリコン層をエッチングする第5のステップと
を含む、請求項1又は2に記載のプラズマエッチング方法。 - シリコン層よりなるとともに、前記シリコン層の上方に、所定のパターンにパターニングされたレジスト層が形成されてなる被処理基板が設置されている処理容器内に、酸素ガスとフッ化硫黄ガスとを含んだエッチングガスを所定の流量で供給し、供給した前記エッチングガスをプラズマ化したプラズマにより、前記レジスト層をマスクとして前記シリコン層をエッチングするプラズマエッチング方法において、
エッチングを開始する際には、フッ化硫黄ガスの流量に対する酸素ガスの流量の流量比を第1の流量比としたときに、前記エッチングガスをプラズマ化したプラズマを前記レジスト層と反応させることで前記被処理基板の表面に保護膜を堆積させる堆積速度と、前記保護膜をエッチングするエッチング速度とが等しくなるような所定磁界よりも大きな第1の磁界を、前記被処理基板に印加するとともに、前記流量比を前記第1の流量比とした状態で、前記被処理基板の表面に前記保護膜を堆積するものであって、
エッチングの進行に伴って、前記被処理基板に前記第1の磁界を印加した状態で、酸素ガスの流量を減少させることによって、前記エッチング速度を前記堆積速度よりも相対的に大きくするものである、プラズマエッチング方法。 - シリコン層よりなるとともに、前記シリコン層の上方に、所定のパターンにパターニングされたレジスト層が形成されてなる被処理基板が設置されている処理容器内に、酸素ガスとフッ化硫黄ガスとを含んだエッチングガスを所定の流量で供給し、供給した前記エッチングガスをプラズマ化したプラズマにより、前記レジスト層をマスクとして前記シリコン層をエッチングして穴部を形成するプラズマエッチング方法において、
エッチングを開始する際には、フッ化硫黄ガスの流量に対する酸素ガスの流量の流量比を第1の流量比としたときに、前記エッチングガスをプラズマ化して発生させた酸素ラジカルを前記レジスト層と反応させることで前記レジスト層の表面及び形成される前記穴部の側壁に保護膜を堆積させる堆積速度と、前記保護膜をエッチングするエッチング速度とが等しくなるような所定磁界よりも大きな第1の磁界を、前記被処理基板に印加するとともに、前記流量比を前記第1の流量比とした状態で、前記レジスト層の表面及び前記穴部の側壁に前記保護膜を堆積するものであって、
前記穴部の深さ寸法の増加に伴って、前記被処理基板に前記第1の磁界を印加した状態で、酸素ガスの流量を減少させることによって、前記エッチング速度を前記堆積速度よりも相対的に大きくするものである、プラズマエッチング方法。
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