JP2015515552A - 低エッチング速度のハードマスク膜のための酸素ドーピングを伴うpvdaln膜 - Google Patents
低エッチング速度のハードマスク膜のための酸素ドーピングを伴うpvdaln膜 Download PDFInfo
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- 239000001301 oxygen Substances 0.000 title claims abstract description 45
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 45
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000005530 etching Methods 0.000 title description 5
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims abstract description 62
- 239000002019 doping agent Substances 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 18
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000004544 sputter deposition Methods 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 9
- 238000000059 patterning Methods 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims 1
- 238000001552 radio frequency sputter deposition Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 7
- 238000001039 wet etching Methods 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 description 10
- 238000005477 sputtering target Methods 0.000 description 6
- 238000005240 physical vapour deposition Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 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
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- CQBLUJRVOKGWCF-UHFFFAOYSA-N [O].[AlH3] Chemical compound [O].[AlH3] CQBLUJRVOKGWCF-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- -1 oxygen nitride Chemical class 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 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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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
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- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
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- H01L21/02266—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by physical ablation of a target, e.g. sputtering, reactive sputtering, physical vapour deposition or pulsed laser deposition
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Abstract
Description
半導体チップを製造するには、多数のプロセスが実行される。パターニングは、それらのプロセスの1つである。パターニングプロセスでは、パターニングすべき1つまたは複数の層の上に、ハードマスクなどのマスクが形成される。その後、このハードマスクを利用して、1つまたは複数の下層がエッチング剤に露出され、その結果、露出された材料(すなわち、ハードマスクまたはフォトマスクによって覆われていない材料)が除去され、ハードマスクのパターンが1つまたは複数の下層に転写される。
理想的なエッチングプロセスでは、露出された材料はエッチングされるが、ハードマスクはエッチングされない。言い換えれば、ハードマスクは、エッチング剤に対して理論上は不活性である。エッチング剤は、液体のエッチング剤または気体のエッチング剤の形態をとることができる。ハードマスクがエッチング剤に対して不活性である場合、ハードマスクの特徴は、1つまたは複数の下層に非常にうまく転写することができる。
しかし当然ながら、化学的に不活性のハードマスクを実際に製造することはできない。したがって、ハードマスクはある程度エッチングされることが予期される。ハードマスクがエッチングされると、パターン転写の精密さは損なわれる。
一実施形態では、ハードマスクは、窒化アルミニウムおよびドーパントを含む。別の実施形態では、ハードマスクを作製する方法は、不活性ガス、窒素含有ガス、および酸素含有ガスを含有する雰囲気中でアルミニウムターゲットをスパッタリングして、酸素でドープされた窒化アルミニウム材料を形成するステップを含み、窒素含有ガスの量は、酸素含有ガスの量の2倍より大きい。この方法は、酸素でドープされた窒化アルミニウム材料をパターニングしてハードマスクを形成するステップをさらに含む。
別の実施形態では、ハードマスクを作製する方法は、不活性ガス、窒素含有ガス、および酸素含有ガスを含有する雰囲気中で窒化アルミニウムターゲットをスパッタリングして、酸素でドープされた窒化アルミニウム材料を形成するステップを含み、窒素含有ガスの量は、酸素含有ガスの量の2倍より大きい。この方法は、酸素でドープされた窒化アルミニウム材料をパターニングしてハードマスクを形成するステップをさらに含む。
本発明の上記の特徴を詳細に理解できるように、上記で簡単に要約した本発明のより詳細な説明は、実施形態を参照することによって得ることができる。これらの実施形態のいくつかを、添付の図面に示す。しかし、本発明は他の等しく有効な実施形態も許容しうるため、添付の図面は本発明の典型的な実施形態のみを示しており、したがって本発明の範囲を限定すると見なすべきではないことに留意されたい。
本発明は、概して、ドープされた窒化アルミニウムのハードマスク、およびドープされた窒化アルミニウムのハードマスクを作製する方法に関する。窒化アルミニウムのハードマスクを形成するとき、酸素などの少量のドーパントを添加することによって、ハードマスクの湿式エッチング速度を著しく低減させることができる。さらに、ドープされていない窒化アルミニウムのハードマスクと比較すると、ドーパントの存在のため、ハードマスクの粒径が低減される。粒径が低減されることで、ハードマスク内の特徴がより平滑になり、このハードマスクを利用すると、下層がより精密にエッチングされる。
上記で論じたように、本明細書に開示する実施形態は、ハードマスク、およびハードマスクを形成する方法に関する。図2は、層202の上に形成されたハードマスク204の概略横断面図である。ハードマスク204は、特徴206が形成されて層202の一部分208を露出させるようにパターニングされている。一実施形態では、層202は、タングステンを含むことができる。別の実施形態では、層202は、多結晶シリコンを含むことができる。ハードマスク204は、ドープされた窒化アルミニウムを含む。ドーパントは、酸素、シリコン、フッ素、炭素、およびこれらの組合せからなる群から選択された1つまたは複数のドーパントを含むことができる。ハードマスク204は、最高25原子パーセントの量でドーパントを含むことができる。
Claims (15)
- 窒化アルミニウムおよびドーパント
を含むハードマスク。 - 前記ドーパントが、酸素、シリコン、フッ素、炭素、およびこれらの組合せからなる群から選択される、請求項1に記載のハードマスク。
- 前記ドーパントが酸素を含む、請求項2に記載のハードマスク。
- 前記酸素が最高25原子パーセントの量で存在する、請求項3に記載のハードマスク。
- 前記ハードマスクが、ドープされていない窒化アルミニウムのハードマスクのハードマスクに対する[0002]ピークより小さい[0002]ピークを有する、請求項4に記載のハードマスク。
- 前記ハードマスクが、ドープされていない窒化アルミニウムのハードマスクの粒径より小さい粒径を有し、前記ドープされた窒化アルミニウムのハードマスクの[0002]ピークが、前記ドープされていない窒化アルミニウムのハードマスクの[0002]ピークの寸法の約1/10である、請求項5に記載のハードマスク。
- 前記ハードマスクが、約−5MPa〜約5MPaの応力を有する、請求項1に記載のハードマスク。
- ハードマスクを作製する方法であって、
不活性ガス、窒素含有ガス、および酸素含有ガスを含有する雰囲気中でアルミニウムターゲットをスパッタリングして、酸素でドープされた窒化アルミニウム材料を堆積させるステップであって、窒素含有ガスの量が酸素含有ガスの量の2倍より大きい、堆積させるステップと、
前記酸素でドープされた窒化アルミニウム材料をパターニングして前記ハードマスクを形成するステップとを含む、方法。 - 前記窒素含有ガスがN2を含む、請求項8に記載の方法。
- 前記酸素含有ガスがO2を含む、請求項9に記載の方法。
- 不活性ガスとN2の比が約1:1〜約1:20であり、N2とO2の比が約100:1〜約20:1である、請求項10に記載の方法。
- 摂氏約25度〜摂氏約500度の温度でスパッタリングが行われ、約1ミリトル〜約100ミリトルのチャンバ圧力で前記スパッタリングが行われる、請求項8に記載の方法。
- 前記スパッタリングが、DCスパッタリングまたはパルスDCスパッタリングである、請求項8に記載の方法。
- ハードマスクを作製する方法であって、
不活性ガス、窒素含有ガス、および酸素含有ガスを含有する雰囲気中で窒化アルミニウムターゲットをスパッタリングして、酸素でドープされた窒化アルミニウム材料を形成するステップであって、窒素含有ガスの量が酸素含有ガスの量の2倍より大きい、形成するステップと、
前記酸素でドープされた窒化アルミニウム材料をパターニングして前記ハードマスクを形成するステップとを含む、方法。 - 前記スパッタリングがRFスパッタリングである、請求項14に記載の方法。
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US201261637804P | 2012-04-24 | 2012-04-24 | |
US61/637,804 | 2012-04-24 | ||
PCT/US2013/037245 WO2013163004A1 (en) | 2012-04-24 | 2013-04-18 | Pvd aln film with oxygen doping for a low etch rate hardmask film |
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WO2016076239A1 (ja) * | 2014-11-12 | 2016-05-19 | シャープ株式会社 | 型の製造方法 |
US11410937B2 (en) | 2020-03-06 | 2022-08-09 | Raytheon Company | Semiconductor device with aluminum nitride anti-deflection layer |
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TW201351503A (zh) | 2013-12-16 |
US9162930B2 (en) | 2015-10-20 |
WO2013163004A1 (en) | 2013-10-31 |
EP2842158A1 (en) | 2015-03-04 |
KR20150022755A (ko) | 2015-03-04 |
TWI575605B (zh) | 2017-03-21 |
JP6272830B2 (ja) | 2018-01-31 |
CN104170068A (zh) | 2014-11-26 |
EP2842158A4 (en) | 2015-12-02 |
KR102073414B1 (ko) | 2020-02-04 |
US20130296158A1 (en) | 2013-11-07 |
CN104170068B (zh) | 2019-05-10 |
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