JP2020088174A - エッチング方法及び基板処理装置 - Google Patents
エッチング方法及び基板処理装置 Download PDFInfo
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- 238000005530 etching Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 66
- 239000000758 substrate Substances 0.000 title claims abstract description 29
- 238000012545 processing Methods 0.000 title claims description 54
- 239000007789 gas Substances 0.000 claims abstract description 158
- 230000001681 protective effect Effects 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 239000003085 diluting agent Substances 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011737 fluorine Substances 0.000 claims abstract description 5
- 239000001257 hydrogen Substances 0.000 claims abstract description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 150000002431 hydrogen Chemical class 0.000 claims 1
- 230000008569 process Effects 0.000 description 20
- 229920002120 photoresistant polymer Polymers 0.000 description 15
- 229910004298 SiO 2 Inorganic materials 0.000 description 14
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 238000007796 conventional method Methods 0.000 description 8
- 238000000151 deposition Methods 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000002826 coolant Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- UOACKFBJUYNSLK-XRKIENNPSA-N Estradiol Cypionate Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H](C4=CC=C(O)C=C4CC3)CC[C@@]21C)C(=O)CCC1CCCC1 UOACKFBJUYNSLK-XRKIENNPSA-N 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 239000006117 anti-reflective coating Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
Description
図1は、一実施形態に係る基板処理装置1の一例を示す図である。本実施形態にかかる基板処理装置1は、平行平板の容量結合型プラズマ処理装置であり、例えば表面が陽極酸化処理されたアルミニウムからなる円筒状の処理容器10を有している。処理容器10は接地されている。
被エッチング対象膜、中間膜、ハードマスクが順に積層された三層構造の積層膜について、ハードマスクの上のフォトレジスト膜のパターンにエッチングする工程がある。図2(a)の例では、ウエハ上に被エッチング対象膜の一例であるSiO2膜(シリコン酸化膜)104が形成され、その上に中間層の一例である有機膜103が形成されている。そして、その上にハードマスクの一例としてDARC(Dielectric Anti-Reflective Coating)膜102が形成され、その上にフォトレジスト膜101のパターンが形成されている。
そこで、一実施形態では、対象膜のCDの制御可能なレンジを広げることができるエッチング方法を提案する。特にこのエッチング方法では、対象膜のCDを縮小させるように制御可能な方向にもレンジを広げることができる。以下、一実施形態にかかるエッチング方法について、図3〜図5を参照しながら説明する。図3は、一実施形態にかかる三層構造のエッチング方法の一例を示すフローチャートである。図4は、一実施形態にかかる三層構造のエッチング工程の一例を示す図である。図5は、一実施形態にかかるエッチング方法の効果の一例を説明するための図である。
(堆積工程)
本実施形態に係るエッチング方法では、図3のフローチャートに一例を示すように、まず、ステップS10において、図4(a)の三層構造の積層膜に対して保護膜105を形成する。図4(b)は、三層構造の積層膜に対して保護膜105が形成された状態を示す。これにより、フォトレジスト膜101のパターンの開口幅が縮小される。本工程のプロセス条件は以下である。
圧力 50mT〜100mT
HF電力 300W
LF電力 0W
ガス種 H2、C4F6、Ar
本工程では、堆積性ガスのC4F6ガスがプラズマ中でCF系の堆積物となりフォトレジスト膜101のパターンの上面、側壁及び底面(DARC膜102上)に堆積し、これにより、保護膜105が形成される。
(DARC膜エッチング工程)
次に、図3のステップS12においてDARC膜102をフォトレジスト膜101上の保護膜105のパターンにエッチングする。図4(c)は、DARC膜102がエッチングされた状態を示す。保護膜105により、DARC膜102のパターンのCDを縮小することができている。本工程のエッチング条件は以下である。
直流電圧(上部電極印加) 450V
ガス種 CF4、CHF3、O2
本工程では、DARC膜102をエッチングし、有機膜103を露出させる。このとき、上記エッチング条件では、フォトレジスト膜101のパターンの底部に形成された保護膜105をDARC膜102とともにエッチングすることができる。
(変形例1)
本実施形態にかかるエッチング方法では、DARC膜102をエッチングする前に保護膜105を形成する第1の工程を実行した。これに対して、以下に説明する本実施形態の変形例1にかかるエッチング方法では、ハードマスクをエッチングする間に保護膜105を形成する第1の工程を実行する。
また、保護膜105を形成する第1の工程と、DARC膜102をエッチングする第2の工程とを繰り返し行ってもよい。変形例2にかかるエッチング方法について、図7を参照して説明する。ステップS10〜S16の処理は本実施形態にかかるエッチング方法と同じである。本実施形態にかかるエッチング方法と異なる点は、ステップS10、S12に示す第1の工程及び第2の工程を所定回数繰り返す点である。変形例2では、第1の工程及び第2の工程を、1回以上又は複数回の予め定められた所定回数繰り返したと判定すると(ステップS18)、有機膜103及びSiO2膜104をエッチングする(ステップS14、S16)。
10 処理容器
16 載置台
20 静電チャック
22 直流電源
34 上部電極
48 第1の高周波電源
90 第2の高周波電源
101 フォトレジスト膜
102 DARC膜
103 有機膜
104 SiO2膜
105 保護膜
200 制御部
Claims (9)
- エッチング対象膜、シリコンを含有するハードマスク及びパターン化されたレジストを有する基板を提供する工程と、
前記ハードマスクをエッチングする前に炭素とフッ素とを含むガスと希釈ガスとを含む第1のガス、又は炭素と水素とを含むガスと希釈ガスとを含む第1のガスからプラズマを生成し、前記基板の表面に保護膜を形成する第1の工程と、
前記第1の工程を実行した後に第2のガスからプラズマを生成し、前記ハードマスクをエッチングする第2の工程と、を有する、エッチング方法。 - エッチング対象膜、シリコンを含有するハードマスク及びパターン化されたレジストを有する基板を提供する工程と、
前記ハードマスクをエッチングする間に炭素とフッ素とを含むガスと希釈ガスとを含む第1のガス、又は炭素と水素とを含むガスと希釈ガスとを含む第1のガスからプラズマを生成し、前記基板の表面に保護膜を形成する第1の工程と、
前記第1の工程を実行した後に第2のガスからプラズマを生成し、前記ハードマスクをエッチングする第2の工程と、を有する、エッチング方法。 - 前記第1のガスに含まれる希釈ガスは、Ar、He及びCOの少なくともいずれかである、
請求項1又は2に記載のエッチング方法。 - 前記第1のガスは、C4F6、C4F8、CH4及びCH2F2の少なくともいずれかを含む、
請求項1〜3のいずれか一項に記載のエッチング方法。 - 前記第2のガスは、炭素とフッ素とを含むガス又は炭素と水素とを含むガスである、
請求項1〜4のいずれか一項に記載のエッチング方法。 - 前記第1の工程において印加するプラズマ生成用の高周波電力は、40MHz〜60MHzの周波数である、
請求項1〜5のいずれか一項に記載のエッチング方法。 - 前記第1の工程と前記第2の工程とを2回以上繰り返し行い、前記ハードマスクをエッチングする、
請求項1〜6のいずれか一項に記載のエッチング方法。 - 前記基板が前記エッチング対象膜と前記ハードマスクとの間に中間層を更に含む、
請求項1〜7のいずれか一項に記載のエッチング方法。 - 処理容器と、前記処理容器内にて基板を載置する載置台と、ガスを供給するガス供給部と、制御部と、を有する基板処理装置であって、
前記制御部は、
請求項1〜8のいずれか一項に記載のエッチング方法の手順を示すプログラムを実行することで、前記基板の処理を制御する基板処理装置。
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