JP6576362B2 - フッ素含有導電膜 - Google Patents
フッ素含有導電膜 Download PDFInfo
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- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45534—Use of auxiliary reactants other than used for contributing to the composition of the main film, e.g. catalysts, activators or scavengers
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28556—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table by chemical means, e.g. CVD, LPCVD, PECVD, laser CVD
- H01L21/28562—Selective deposition
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76898—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics formed through a semiconductor substrate
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Description
ALD型プロセスは、前駆体化学物質の制御された自己制限型の表面反応に基づく。反応チャンバの中へ前駆体を交互に逐次的に供給することによって気相反応が回避される。気相反応体は、たとえば反応体パルスの間に反応チャンバから余分な反応体および/または反応体副生成物を除くことによって反応チャンバの中で互いに分離される。
上記で述べ、下記で詳細に考察するように、金属フッ化物を含む導電性の、導電膜は、金属フッ化物堆積サブサイクルと還元サブサイクルとを用いて堆積することができる。いくつかの実施形態において、金属は、Ti、Ta、Nb、MoおよびWから選ぶことができる。これら二つのサブサイクルは、滑らかなおよび/またはナノ結晶膜を形成するために、スーパーサイクル内で所望の比で繰り返すことができる。いくつかの実施形態において、導電性薄膜、たとえば金属フッ化物を含む薄膜は、柱形結晶粒構造を有しない。
a[b(MF)+c(還元剤+窒素化合物)]と書くことができる。ここでMFは、MxFyサブサイクルを表わし、bは、各スーパーサイクル内のMFサブサイクルの数であり、(還元剤+窒素化合物)は、還元サブサイクルを表し、cは、各スーパーサイクル内の還元サブサイクルの数であり、aは、スーパーサイクルの数である。還元サブサイクルに対する金属フッ化物サブサイクルの比は、b:cとして与えられる。
a[b(MF+還元剤)+c(窒素反応体)]と書くことができる。ここで、bは、各スーパーサイクル内のMFサブサイクル還元剤を含む―であり、cは、各スーパーサイクル内の窒素反応体サブサイクルの数であり、aは、スーパーサイクルの数である。窒素サブサイクルに対する金属フッ化物サブサイクルの比は、b:cとして与えることができる。
上記で述べたように、いくつかの実施形態においてTiF3を含む膜、たとえばTiFx化合物―たとえばTiF3―を含む導電膜を堆積するための原子層堆積プロセスは、複数のスーパーサイクルを含んでよく、各スーパーサイクルは、少なくとも一つのTiF4サブサイクルと、少なくとも一つの還元サブサイクルとを含む。TiF4サブサイクルにおいて基板は、最大でモノレイヤーが基板表面に吸着するように気相TiF4に曝露される。還元サブサイクルにおいて基板は、還元剤たとえばシランまたはボランおよび窒素反応体に曝露される。TiF4サブサイクルと還元サブサイクルとの比は、所望の組成を実現するように変えることができ、スーパーサイクルの数は、所望の厚さのフッ化チタン膜を堆積するように選ぶことができる。TiF4サブサイクルは、還元サブサイクルに先行することもあり、逆になることもある。同様に、還元サイクルにおいて、還元剤は、窒素反応体に先行することもあり、逆になることもある。
a[b(フッ化チタン)+c(還元剤+窒素反応体)]と書くことができる。ここで、(フッ化チタン)は、TiF4サブサイクルを表し、bは、各スーパーサイクル内のTiF4サブサイクルの数であり、(還元剤+窒素反応体)は、還元サブサイクルを表し、cは、各スーパーサイクル内の還元サブサイクルの数であり、aは、スーパーサイクルの数である。スーパーサイクル内でTiF4サブサイクルが最初に来るように例示されているが、いくつかの実施形態において、一以上のスーパーサイクル内で還元サブサイクルが最初に来る。したがっていくつかの実施形態においてはTiF4サブサイクルが第一のサブサイクルであり、還元サブサイクルが第二のサブサイクルであると考えることができるが、いくつかの実施形態においては還元サブサイクルが第一のサブサイクルであり、TiF4サブサイクルが第二のサブサイクルであると考えることができる。
a[b(TiF4+還元剤)+c(窒素反応体)]と書くことができる。ここで、bは、各スーパーサイクル内のTiF4サブサイクル還元剤を含む―の数であり、cは、各スーパーサイクル内の窒素反応体サブサイクルの数であり、aは、スーパーサイクルの数である。窒素サブサイクルに対する金属フッ化物サブサイクルの比は、b:cとして与えられる。
最大でフッ化チタンの分子モノレイヤーを基板の上に形成するために、気化されたTiFx、たとえばTiF4を反応チャンバ210の中へパルスするステップと、
もしあれば、余分なフッ化チタンと、反応副生成物と、を除去するために反応チャンバ220をパージするステップと、
パルスするステップとパージするステップとを繰り返すステップ250と、
を含む。
TiF4の少なくとも一部をTiF3へ還元するために、気化された還元剤、たとえばジシランまたはトリシランを反応チャンバ310の中へパルスするステップと、
もしあれば、余分な還元剤と、反応副生成物とを除去するために反応チャンバ320をパージするステップと、
窒素反応体、たとえばNH3のパルスを反応チャンバ330の中へ供給し、そこで窒素反応体は、少なくとも一部の窒素をフッ化チタン膜に付与するステップと、
余分な窒素反応体と、あらゆるガス状の副生成物と、を除去するために反応チャンバ340をパージするステップと、
パルスするステップとパージするステップとを繰り返すステップ350と、
を含む。
Claims (19)
- 基板の上に、TiF3を含む導電性のフッ化物薄膜を堆積するための原子層堆積(ALD)プロセスであって、
複数のスーパーサイクルを含み、各スーパーサイクルは、金属フッ化物サブサイクルと還元サブサイクルとを含み、
前記金属フッ化物サブサイクルは、前記基板を金属フッ化物と接触させるステップを含み、
前記還元サブサイクルは、前記基板を還元剤および窒素反応体と交互に逐次的に接触させるステップを含み、
前記フッ化物薄膜として、0.5原子%以上50原子%以下の範囲の窒素を含む薄膜を堆積する、プロセス。 - 前記金属フッ化物は、Ti、Ta、Nb、MoおよびWから選ばれる金属を含む、請求項1に記載のプロセス。
- 前記金属フッ化物は、TiF4を含む、請求項1に記載のプロセス。
- 前記還元剤は、シランまたはボランである、請求項1に記載のプロセス。
- 前記還元剤は、ジシランまたはトリシランを含む、請求項4に記載のプロセス。
- 前記窒素反応体は、アンモニア、N2H4、窒素原子、窒素含有プラズマおよび窒素ラジカルからなる群から選ばれる、請求項1に記載のプロセス。
- 前記複数のスーパーサイクルの少なくとも一つにおいて、前記還元サブサイクルに対する前記金属フッ化物サブサイクルの比が、少なくとも0.1となるように実行される、請求項1に記載のプロセス。
- 前記フッ化物薄膜は、5原子%から40原子%の窒素を含む、請求項1に記載のプロセス。
- 前記フッ化物薄膜は、300℃未満において周囲空気によって酸化されない、請求項1に記載のプロセス。
- TiF3を含み、0.5原子%以上50原子%以下の範囲の窒素を含み、106μΩcm未満の層抵抗率を示す、連続的な導電性フッ化物薄膜。
- 前記薄膜は、5原子%から40原子%の窒素を含む、請求項10に記載の薄膜。
- 前記薄膜は、100nm未満の厚さを有する、請求項10に記載の薄膜。
- 基板の上に、TiF3を含む導電性のフッ化物薄膜を堆積するための原子層堆積(ALD)プロセスであって、
複数のスーパーサイクルを含み、各スーパーサイクルは、金属フッ化物サブサイクルと第二のサブサイクルとを含み、
前記金属フッ化物サブサイクルは、前記基板を金属フッ化物と接触させるステップを含み、
前記第二のサブサイクルは、前記基板を窒素反応体と接触させるステップを含み、
前記金属フッ化物サブサイクルおよび前記第二のサブサイクルの少なくとも一つにおいて、シラン化合物およびボラン化合物のうち少なくとも一つが、逐次的に供給され、
前記フッ化物薄膜として、0.5原子%以上50原子%以下の範囲の窒素を含む薄膜を堆積する、プロセス。 - 前記金属フッ化物サブサイクルにおいてシラン化合物およびボラン化合物のうちの少なくとも一つが供給される、請求項13に記載のプロセス。
- 前記第二のサブサイクルにおいてシラン化合物およびボラン化合物のうちの少なくとも一つが供給される、請求項13に記載のプロセス。
- 前記プロセスによって実現される前記フッ化物薄膜は、100nm未満の厚さを有する、請求項13に記載のプロセス。
- 前記シラン化合物、ボラン化合物および窒素反応体のうちの少なくとも一つは、前記金属フッ化物の金属の少なくとも一部を還元する、請求項13に記載のプロセス。
- 前記プロセスによって実現される前記フッ化物薄膜は、106μΩcm未満の層抵抗率を示す、請求項13に記載のプロセス。
- 前記プロセスによって実現される前記フッ化物薄膜は、300℃未満の温度において実質的に酸化を示さない、請求項13に記載のプロセス。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/255,799 | 2014-04-17 | ||
| US14/255,799 US10643925B2 (en) | 2014-04-17 | 2014-04-17 | Fluorine-containing conductive films |
| PCT/US2015/023492 WO2015160499A1 (en) | 2014-04-17 | 2015-03-31 | Fluorine-containing conductive films |
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| Publication Number | Publication Date |
|---|---|
| JP2017521549A JP2017521549A (ja) | 2017-08-03 |
| JP6576362B2 true JP6576362B2 (ja) | 2019-09-18 |
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| JP2016562266A Active JP6576362B2 (ja) | 2014-04-17 | 2015-03-31 | フッ素含有導電膜 |
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| US (3) | US10643925B2 (ja) |
| JP (1) | JP6576362B2 (ja) |
| KR (3) | KR102218668B1 (ja) |
| CN (2) | CN110265295A (ja) |
| TW (3) | TW202305167A (ja) |
| WO (1) | WO2015160499A1 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| TWI780541B (zh) | 2022-10-11 |
| KR20220165801A (ko) | 2022-12-15 |
| TW202305167A (zh) | 2023-02-01 |
| TWI716346B (zh) | 2021-01-21 |
| WO2015160499A1 (en) | 2015-10-22 |
| TW201542856A (zh) | 2015-11-16 |
| US11823976B2 (en) | 2023-11-21 |
| KR20210021408A (ko) | 2021-02-25 |
| KR102472965B1 (ko) | 2022-12-01 |
| TW202115274A (zh) | 2021-04-16 |
| US20230085443A1 (en) | 2023-03-16 |
| KR102673965B1 (ko) | 2024-06-11 |
| CN110265295A (zh) | 2019-09-20 |
| CN106471154B (zh) | 2019-06-28 |
| KR102218668B1 (ko) | 2021-02-23 |
| US20200235037A1 (en) | 2020-07-23 |
| US10643925B2 (en) | 2020-05-05 |
| JP2017521549A (ja) | 2017-08-03 |
| CN106471154A (zh) | 2017-03-01 |
| US11450591B2 (en) | 2022-09-20 |
| US20150303101A1 (en) | 2015-10-22 |
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