JP7321623B2 - ナノ結晶質グラフェン、及びナノ結晶質グラフェンの形成方法 - Google Patents
ナノ結晶質グラフェン、及びナノ結晶質グラフェンの形成方法 Download PDFInfo
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- JP7321623B2 JP7321623B2 JP2018212951A JP2018212951A JP7321623B2 JP 7321623 B2 JP7321623 B2 JP 7321623B2 JP 2018212951 A JP2018212951 A JP 2018212951A JP 2018212951 A JP2018212951 A JP 2018212951A JP 7321623 B2 JP7321623 B2 JP 7321623B2
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- nanocrystalline graphene
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Description
ナノサイズの結晶を含み、
全体炭素に対するsp2結合構造(bonding structure)を有する炭素の比率が50%~99%であるナノ結晶質グラフェンが提供される。
ナノサイズの結晶を含み、
1~20at%(atomic percent)の水素を含むナノ結晶質グラフェンが提供される。
ナノサイズの結晶を含み、全体炭素に対するsp2結合構造を有する炭素の比率が50%~99%であるナノ結晶質グラフェンをプラズマ化学気相蒸着工程によって形成する方法において、
反応ガスが炭素ソース及び非活性ガスを含み、700℃以下の温度で、前記反応ガスのプラズマを利用し、基板に前記ナノ結晶質グラフェンを直接成長させて形成するナノ結晶質グラフェンの形成方法が提供される。
ナノサイズの結晶を含み、全体炭素に対するsp2結合構造を有する炭素の比率が50%~99%であるナノ結晶質グラフェンをプラズマ化学気相蒸着工程によって形成する方法において、
反応チャンバ内に、炭素ソース及び非活性ガスを含む反応ガスを注入する段階と、
前記反応チャンバ内に、前記反応ガスのプラズマを生成させる段階と、
700℃以下の温度で、前記反応ガスのプラズマを利用し、基板の表面に前記ナノ結晶質グラフェンを直接成長させて形成する段階と、を含むナノ結晶質グラフェンの形成方法が提供される。
190,290 ナノ結晶質グラフェン
391 第1ナノ結晶質グラフェン
392 第2ナノ結晶質グラフェン
Claims (32)
- ナノサイズの結晶を含み、全体炭素に対するsp2結合構造を有する炭素の比率が50%~99%であるナノ結晶質グラフェンをプラズマ化学気相蒸着工程によって形成する方法において、
反応ガスが、炭素ソース及び非活性ガスを含み、700℃以下の温度で、前記反応ガスのプラズマを利用し、基板に、前記ナノ結晶質グラフェンを、分あたり0.05nm以上の厚みで直接成長させて形成し、
前記基板は、IV族半導体物質、半導体化合物、及び絶縁物質のうち少なくとも一つを含む、ナノ結晶質グラフェンの形成方法。 - 前記ナノ結晶質グラフェンは、炭素に対するオージェスペクトルにおいて、18~22.9eVのDパラメータを含むことを特徴とする請求項1に記載のナノ結晶質グラフェンの形成方法。
- 前記ナノ結晶質グラフェンは、1~20at%の水素を含むことを特徴とする請求項1または2に記載のナノ結晶質グラフェンの形成方法。
- 前記ナノ結晶質グラフェンは、1.6~2.1g/ccの密度を有することを特徴とする請求項1から3の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記反応ガスは、水素ガスを含まないか、あるいは水素ガスをさらに含むことを特徴とする請求項1から4の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記炭素ソース、非活性ガスと水素ガスとの体積比は、1:0.01~5,000:0~300であることを特徴とする請求項5に記載のナノ結晶質グラフェンの形成方法。
- 前記炭素ソースは、炭化水素ガス、及び炭素を含む液状前駆体の蒸気のうち少なくとも一つを含むことを特徴とする請求項1から6の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記前駆体は、CxHy(6≦x≦42、6≦y≦28)の化学式を有する芳香族炭化水素及びその誘導体と、CxHy(1≦x≦12、2≦y≦26)の化学式を有する脂肪族炭化水素及びその誘導体とのうち少なくとも一つを含むことを特徴とする請求項7に記載のナノ結晶質グラフェンの形成方法。
- 前記非活性ガスは、アルゴンガス、ネオンガス、窒素ガス、ヘリウムガス、クリプトンガス及びキセノンガスのうち少なくとも一つを含むことを特徴とする請求項1から8の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記ナノ結晶質グラフェンは、180℃~700℃の工程温度で成長されることを特徴とする請求項1から9の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記ナノ結晶質グラフェンは、0.001Torr~10Torrの工程圧力で成長されることを特徴とする請求項1から10の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記プラズマは、少なくとも1つのRF(radio frequency)プラズマ発生装置または、少なくとも1つのMW(microwave)プラズマ発生装置によって発生することを特徴とする請求項1から11の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記プラズマは、3~100MHzの周波数領域を有するRFプラズマ、または0.7~2.5GHzの周波数領域を有するMWプラズマを含むことを特徴とする請求項12に記載のナノ結晶質グラフェンの形成方法。
- 前記反応ガスのプラズマを生成するための電力は、10W~4,000Wであることを特徴とする請求項1から13の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記IV族半導体物質は、Si、GeまたはSnを含むことを特徴とする請求項1から14の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記半導体化合物は、Si、Ge、C、Zn、Cd、Al、Ga、In、B、N、P、S、Se、As、Sb及びTeのうち少なくとも2個の元素が結合された物質を含むことを特徴とする請求項1から15の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記絶縁物質は、Si、Al、Hf、Zr、Zn、Ti、Ta、W及びMnのうち少なくとも一つを含むか、あるいはSi、Ni、Al、W、Ru、Co、Mn、Ti、Ta、Au、Hf、Zr、Zn、Y、Cr、Cu、Mo及びGdのうち少なくとも1つの酸化物、窒化物、炭化物、及びそれらの誘導体のうち少なくとも一つを含むことを特徴とする請求項1から16の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記酸化物、窒化物、炭化物、及びそれらの誘導体のうち少なくとも一つは、Hを含むことを特徴とする請求項17に記載のナノ結晶質グラフェンの形成方法。
- 前記基板は、ドーパントをさらに含むことを特徴とする請求項1から18の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記ナノ結晶質グラフェンを成長させる前に、還元性ガスを利用し、前記基板表面を前処理する段階をさらに含むことを特徴とする請求項1から19の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記還元性ガスは、水素、塩素、フッ素、アンモニア、及びそれらの誘導体のうち少なくとも一つを含むことを特徴とする請求項20に記載のナノ結晶質グラフェンの形成方法。
- 前記還元性ガスは、非活性ガスをさらに含むことを特徴とする請求項21に記載のナノ結晶質グラフェンの形成方法。
- 前記基板に、前記ナノ結晶質グラフェンを一次に形成した後、前記反応ガスの混合比を調節し、前記ナノ結晶質グラフェンに、さらなるナノ結晶質グラフェンを二次で形成する段階をさらに含むことを特徴とする請求項1から22の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記反応ガスは、水素ガスを含まないか、あるいは水素ガスをさらに含むことを特徴とする請求項23に記載のナノ結晶質グラフェンの形成方法。
- 請求項1ないし24のうちいずれか1項に記載の前記ナノ結晶質グラフェンを形成する方法を遂行する装置。
- ナノサイズの結晶を含み、全体炭素に対するsp2結合構造を有する炭素の比率が50%~99%であるナノ結晶質グラフェンをプラズマ化学気相蒸着工程によって形成する方法において、
反応チャンバ内に、炭素ソース及び非活性ガスを含む反応ガスを注入する段階と、
前記反応チャンバ内に、前記反応ガスのプラズマを生成させる段階と、
700℃以下の温度で、前記反応ガスのプラズマを利用し、基板表面に前記ナノ結晶質グラフェンを、分あたり0.05nm以上の厚みで直接成長させて形成する段階と、を含み、
前記基板は、IV族半導体物質、半導体化合物、及び絶縁物質のうち少なくとも一つを含む、ナノ結晶質グラフェンの形成方法。 - 前記ナノ結晶質グラフェンは、炭素に対するオージェスペクトルにおいて、18~22.9eVのDパラメータを含むことを特徴とする請求項26に記載のナノ結晶質グラフェンの形成方法。
- 前記ナノ結晶質グラフェンは、1~20at%の水素を含むことを特徴とする請求項26または27に記載のナノ結晶質グラフェンの形成方法。
- 前記ナノ結晶質グラフェンは、1.6~2.1g/ccの密度を有することを特徴とする請求項26から28の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 還元性ガスを利用し、前記基板表面を前処理する段階をさらに含むことを特徴とする請求項26から29の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記基板に、前記ナノ結晶質グラフェンを一次に形成した後、前記反応ガスの混合比を調節し、前記ナノ結晶質グラフェンに、さらなるナノ結晶質グラフェンを二次で形成する段階をさらに含むことを特徴とする請求項26から30の何れか一項に記載のナノ結晶質グラフェンの形成方法。
- 前記さらなるナノ結晶質グラフェンを形成した後、前記さらなるナノ結晶質グラフェンに、少なくとも1つの他のさらなるナノ結晶質グラフェンを形成する段階をさらに含むことを特徴とする請求項31に記載のナノ結晶質グラフェンの形成方法。
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