JP2019125793A - 基板上の窒化ホウ素およびグラフェンの直接および連続形成 - Google Patents
基板上の窒化ホウ素およびグラフェンの直接および連続形成 Download PDFInfo
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- JP2019125793A JP2019125793A JP2019031183A JP2019031183A JP2019125793A JP 2019125793 A JP2019125793 A JP 2019125793A JP 2019031183 A JP2019031183 A JP 2019031183A JP 2019031183 A JP2019031183 A JP 2019031183A JP 2019125793 A JP2019125793 A JP 2019125793A
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- boron nitride
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Classifications
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Abstract
Description
90ナノメータの膜厚を有する約5センチメーター(2インチ)の直径の二酸化シリコン層が、n型(n++)シリコン基板上に形成された。基板は、酸素プラズマ(100W、600mTorr、2分)を用いて洗浄された。PMMAの層が、シリカ基板上に、約10nmの膜厚でスピンコートされた(1%アセトン、400rpm(1例として))。400nm膜厚のニッケル層が、金属蒸着システム中で、PMMA層の上に堆積された。金属−オン−PMMA−オン−シリカ−オン−シリコン基板が、CVDチャンバの中に入れられた。サンプルは、1000℃で5分間、加熱して、膜をアニールした。雰囲気は、水素ガスを含み、圧力は7Torrであった。最後にサンプルは約10℃/秒で室温まで急冷された。これで、金属とシリカの間の界面にグラフェンを形成した。最後に金属膜が硝酸鉄(III)を用いてエッチングされ、シリカ−オン−シリコン基板の上にグラフェンを残した。
90ナノメータの膜厚を有する約5センチメーター(2インチ)の直径の二酸化シリコン層が、n型(n++)シリコン基板上に形成された。基板は、酸素プラズマ(100W、600mTorr、2分)を用いて洗浄された。400nm膜厚のニッケル層が、金属蒸着システム中で、二酸化シリコン層の上に堆積された。金属−オン−シリカ−オン−シリコン基板が、CVDチャンバの中に入れられた。サンプルは、1000℃で5分間、加熱して、膜をアニールした。雰囲気は、メタン:水素が1:10のモル比でメタンと水素ガスを含み、圧力は100Torrであった。最後にサンプルは約10℃/秒で室温まで急冷された。これで、金属とシリカの間の界面にグラフェンを形成した。最後に金属膜が硝酸鉄(III)を用いてエッチングされ、シリカ−オン−シリコン基板の上にグラフェンを残した。
300ナノメータの膜厚を有する約5センチメーター(2インチ)の直径の二酸化シリコン層が、n型(n++)シリコン基板上に形成された。基板は、酸素プラズマ(100W、600mTorr、2分)を用いて洗浄された。六方晶の窒化ホウ素(hBN)薄片/シートが機械的に剥離され、スコッチテープ法を用いて300nmSiO2基板の上に移され、洗浄された。続いて、基板には、コールドスパッタリングシステムを用いて銅薄膜(100nm〜300nm)をスパッタした。CVD成長は、環境圧力で、4インチの石英管の中で、水素ガス(5〜10sccm)とメタンガス(95〜90sccm)からなる100sccnmの総ガス流量で、1000℃で40分間行った。最後に、上部グラフェン層は、O2プラズマエッチングされ、銅は洗浄された。ラマン分光法は、グラフェンの特徴的な窒化ホウ素とGピークを明らかにした。
このプロセスでは、SiO2−オン−シリコン基板の上にGBNを作製する。100〜400nm膜厚のニッケルまたは銅の膜が、SiO2基板の広い面積の上に堆積され、CVDチャンバ中に配置される。BN膜を作製するために、ジボラン(B2H6)とアンモニア(1:2モル比)が、チャンバ中に導入され、サンプルが1000℃で熱処理される。Niの場合、これにより金属膜はB原子およびN原子で飽和し、薄いCuの場合、これはB原子およびN原子を、結晶粒界を通って拡散させて、金属−基板界面の上に核生成させる。Niの場合、基板を急冷してB原子およびN原子を沈殿させて、金属−SiO2−界面(および上面)にBNを形成する。Niまたは薄いCuの場合、上部BN層は、プラズマエッチングされる。同様に、次の工程で、炭素源としてCH4ガスを用いて、金属−BN界面にグラフェンを成長させ、上部グラフェン層はプラズマエッチングされる。最後に、金属膜をエッチング除去して、SiO2基板上のGBNを得る。
Claims (9)
- 多層物体であって、
2つの主な、ほぼ平行な面であって、1つはドナー基板の表面であり他はドナー基板の裏面である面と、表面と裏面をつなぐ周辺エッジと、表面と裏面との間の中央平面とを含む半導体基板、
半導体基板の表面に接触する窒化ホウ素層と、
窒化ホウ素層に接触するグラフェン層と、を含む多層物体。 - 更に、グラフェン層と接触する金属膜を含み、金属膜は、金属膜表面と、金属膜裏面と、金属膜表面と金属膜裏面との間のバルク金属領域とを含む請求項1に記載の多層物体。
- 金属膜は、ニッケル、銅、鉄、プラチナ、パラジウム、ルテニウム、コバルト、およびそれらの合金からなるグループから選択される金属を含む請求項2に記載の多層物体。
- 更に、グラフェン層に接触する第2の窒化ホウ素層を含む請求項1〜3のいずれかに記載の多層物体。
- 半導体基板は、半導体ウエハを含む請求項1〜4のいずれかに記載の多層物体。
- 半導体ウエハは、シリコン、砒化ガリウム、炭化シリコン、シリコンゲルマニウム、窒化シリコン、二酸化シリコン、およびゲルマニウム、およびそれらの組み合わせからなるグループから選択される材料を含む請求項5に記載の多層物体。
- 半導体ウエハは、チョクラルスキ法で成長した単結晶シリコンインゴットから切り出されたシリコウエハを含む請求項6に記載の多層物体。
- 半導体基板の表面は、誘電体層を含む請求項7に記載の多層物体。
- 窒化ホウ素層は、2から約100までの単原子膜厚のグラフェン層を含む請求項1〜8のいずれかに記載の多層物体。
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EP4293707A3 (en) | 2024-03-27 |
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JP6228293B2 (ja) | 2017-11-08 |
JP2016526286A (ja) | 2016-09-01 |
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JP6488350B2 (ja) | 2019-03-20 |
EP4293707A2 (en) | 2023-12-20 |
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