JP6883495B2 - エッチング方法 - Google Patents
エッチング方法 Download PDFInfo
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- JP6883495B2 JP6883495B2 JP2017169464A JP2017169464A JP6883495B2 JP 6883495 B2 JP6883495 B2 JP 6883495B2 JP 2017169464 A JP2017169464 A JP 2017169464A JP 2017169464 A JP2017169464 A JP 2017169464A JP 6883495 B2 JP6883495 B2 JP 6883495B2
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- 238000005530 etching Methods 0.000 title claims description 87
- 238000000034 method Methods 0.000 title claims description 84
- 239000007789 gas Substances 0.000 claims description 122
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 64
- 229910052710 silicon Inorganic materials 0.000 claims description 64
- 239000010703 silicon Substances 0.000 claims description 64
- 229910052721 tungsten Inorganic materials 0.000 claims description 62
- 239000010937 tungsten Substances 0.000 claims description 62
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 58
- 238000012545 processing Methods 0.000 claims description 48
- 239000002243 precursor Substances 0.000 claims description 36
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- 239000001257 hydrogen Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 229910052731 fluorine Inorganic materials 0.000 claims description 9
- 239000011737 fluorine Substances 0.000 claims description 9
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 7
- 150000002431 hydrogen Chemical class 0.000 claims description 5
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 4
- NXHILIPIEUBEPD-UHFFFAOYSA-H tungsten hexafluoride Chemical compound F[W](F)(F)(F)(F)F NXHILIPIEUBEPD-UHFFFAOYSA-H 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 2
- 238000002474 experimental method Methods 0.000 description 23
- 239000012159 carrier gas Substances 0.000 description 13
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- -1 tungsten halide Chemical class 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 101000911772 Homo sapiens Hsc70-interacting protein Proteins 0.000 description 3
- 229910003481 amorphous carbon Inorganic materials 0.000 description 3
- 238000000231 atomic layer deposition Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 101001139126 Homo sapiens Krueppel-like factor 6 Proteins 0.000 description 1
- 101000661807 Homo sapiens Suppressor of tumorigenicity 14 protein Proteins 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- KPGXUAIFQMJJFB-UHFFFAOYSA-H tungsten hexachloride Chemical compound Cl[W](Cl)(Cl)(Cl)(Cl)Cl KPGXUAIFQMJJFB-UHFFFAOYSA-H 0.000 description 1
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Description
<第1の実験におけるエッチングの条件>
内部空間12sの圧力:25mTorr(3,333Pa)
第1の高周波:100MHz、2.3kW
第2の高周波:3MHz、1kW
処理ガス:H2ガス、CF4ガス、CH2F2ガス、及び、NF3ガスの混合ガス
<第2の実験における工程ST1の条件>
工程ST11
内部空間12sの圧力:800mTorr(107Pa)
WF6ガスの流量:170sccm
キャリアガス(Arガス)の流量:600sccm
処理時間:10秒
工程ST12
内部空間12sの圧力:800mTorr(107Pa)
キャリアガス(Arガス)の流量:800sccm
処理時間:30秒
工程ST13
内部空間12sの圧力:800mTorr(107Pa)
H2ガスの流量:500sccm
キャリアガス(Arガス)の流量:600sccm
第1の高周波:100MHz、500W
第2の高周波:0W
処理時間:3秒
工程ST14
内部空間12sの圧力:800mTorr(107Pa)
キャリアガス(Arガス)の流量:800sccm
処理時間:30秒
サイクルCYの実行回数:30回
Claims (7)
- 単一のシリコン酸化膜、又は、交互に積層された複数のシリコン酸化膜及び複数のシリコン窒化膜を有するシリコン含有膜のエッチング方法であって、
該エッチング方法は、前記シリコン含有膜を有する被加工物がプラズマ処理装置のチャンバ本体内に配置された状態で実行され、
前記被加工物は、前記シリコン含有膜上に設けられたマスクを更に有し、該マスクは炭素を含有し、該マスクには開口が形成されており、
該エッチング方法は、
前記被加工物上にタングステン膜を形成する工程であり、前記マスクの上面を含み、且つ、前記マスクの前記開口から部分的に露出した前記シリコン含有膜の表面以外の領域に、該タングステン膜を形成する、該工程と、
前記シリコン含有膜をエッチングする工程と、
を含み、
タングステン膜を形成する前記工程は、
前記被加工物上にタングステンを含有する前駆体を堆積させるために、前記被加工物に、タングステンを含有する前駆体ガスを供給する工程と、
前記被加工物上の前記前駆体に水素の活性種を供給するために、水素ガスのプラズマを生成する工程と、
を含み、
前記シリコン含有膜をエッチングする前記工程では、前記シリコン含有膜をエッチングするために前記チャンバ本体内でフッ素、水素、及び、炭素を含む処理ガスのプラズマが生成される、
エッチング方法。 - 単一のシリコン酸化膜、又は、交互に積層された複数のシリコン酸化膜及び複数のシリコン窒化膜を有するシリコン含有膜のエッチング方法であって、
該エッチング方法は、前記シリコン含有膜を有する被加工物がプラズマ処理装置のチャンバ本体内に配置された状態で実行され、
前記被加工物は、前記シリコン含有膜上に設けられたマスクを更に有し、該マスクは炭素を含有し、該マスクには開口が形成されており、
該エッチング方法は、
前記被加工物上にタングステン膜を形成する工程と、
前記シリコン含有膜をエッチングする工程と、
を含み、
タングステン膜を形成する前記工程は、
前記被加工物上にタングステンを含有する前駆体を堆積させるために、前記被加工物に、タングステンを含有する前駆体ガスを供給する工程と、
前記被加工物上の前記前駆体に水素の活性種を供給するために、水素ガスのプラズマを生成する工程と、
を含み、
前記シリコン含有膜をエッチングする前記工程では、前記シリコン含有膜をエッチングするために前記チャンバ本体内でフッ素、水素、及び、炭素を含む処理ガスのプラズマが生成され、
タングステン膜を形成する前記工程、及び、前記シリコン含有膜をエッチングする前記工程において、前記被加工物の温度が0℃以下の温度に設定される、
エッチング方法。 - タングステン膜を形成する前記工程と前記シリコン含有膜をエッチングする前記工程とが交互に繰り返される、請求項1又は2に記載のエッチング方法。
- タングステン膜を形成する前記工程において、前駆体ガスを供給する前記工程と水素ガスのプラズマを生成する前記工程とが交互に繰り返される、請求項1〜3の何れか一項に記載のエッチング方法。
- タングステン膜を形成する前記工程、及び、前記シリコン含有膜をエッチングする前記工程において、前記被加工物の温度が−20℃以下の温度に設定される、請求項1〜4の何れか一項に記載のエッチング方法。
- 前記前駆体ガスは、ハロゲン化タングステンガスである、請求項1〜5の何れか一項に記載のエッチング方法。
- 前記前駆体ガスは、六フッ化タングステンガスである、請求項1〜5の何れか一項に記載のエッチング方法。
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