JP4871973B2 - 半導体薄膜素子の製造方法並びに半導体ウエハ、及び、半導体薄膜素子 - Google Patents
半導体薄膜素子の製造方法並びに半導体ウエハ、及び、半導体薄膜素子 Download PDFInfo
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- JP4871973B2 JP4871973B2 JP2009109282A JP2009109282A JP4871973B2 JP 4871973 B2 JP4871973 B2 JP 4871973B2 JP 2009109282 A JP2009109282 A JP 2009109282A JP 2009109282 A JP2009109282 A JP 2009109282A JP 4871973 B2 JP4871973 B2 JP 4871973B2
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Description
したがって、成長基板側の半導体層表面を分子間力接合によって別の基板上に接合することができる。また、成長基板側の半導体層表面を分子間力接合によって別の基板上に形成した金属層に直接密着させ接合し固定させ、接合した金属層と低抵抗コンタクトを形成することができる。
図1乃至図8は、本発明の第1の実施形態を示す図である。以下、これらの図を参照しながら本実施形態を説明する。
(1)剥離するための犠牲層を設ける必要がないので、製造工程が簡略化できる。
(2)平坦性のよい剥離面が得られるので、分子間力接合が可能となる。
(3)接合する分離島の剥離面のキャリア濃度を高濃度にすることができるので、金属層上に接合することで、低抵抗のオーミック接触を容易に形成する行うことができる。
(4)Si(111)基板を再利用することができる。
図9乃至図12は、本発明の第2の実施形態を説明する図である。第2の実施形態が第1の実施形態と異なる点は、Si(111)基板101上に形成する半導体層の材料が異なる点にある。したがって、Si(111)基板101からの分離島350の剥離工程及び第2の基板への接合工程は、第1の実施形態と同様であるので、本実施形態が第1の実施形態と異なる点を中心に説明する。
(1)Siの熱伝導率よりも高い熱伝導率を持つ基板を備えた3C−SiCデバイスを形成できる。
(2)3C−SiCデバイスを薄膜配線で接続することによって第2の基板上に高密度に集積できる。
図11及び図12に第2の実施形態の変形例を示す。
図11(a)及び図11(b)に示すように、本実施形態の構成要素のSiC層303の表面に窒化物半導体層403を形成して(図11(a))、前記手段によってSi(111)基板の所定の厚さ部分101bを含む分離島450をSi(111)基板101から剥離した後、分離島450を第2の基板201の表面に形成された接合層210の表面に接合した工程を備えるようにすることもできる(図11(a))。
101a エッチングされるSi(111)基板の表面側の一部
101b 分離島のSi(111)基板の所定の厚さ部分
102 バッファ層
102a 分離島のバッファ層
103 窒化物半導体層(半導体単結晶層)
103a 分離島の窒化物半導体層
150 分離島
200 被覆層
201 第2の基板(別の基板)
202 接合層
302 炭化層
302a 分離島の炭化層
303 3C−SiC層(SiC層)
303a 分離島の3C−SiC層
350 分離島
403 窒化物半導体層
450、451 分離島
Claims (20)
- Si(111)基板の表面にバッファ層と半導体単結晶層とを順次形成する第1の工程と、
前記半導体単結晶層と前記バッファ層と前記Si(111)基板の所定の厚さ部分とを含む分離島を形成する第2の工程と、
前記分離島の表面を覆う被覆層を形成する第3の工程と、
前記被覆層をマスクに前記Si(111)基板をSi(111)面に沿ってエッチングして剥離する第4の工程と、
前記分離島の剥離面を別の基板の表面に接合する第5の工程と
を備えることを特徴とする半導体薄膜素子の製造方法。 - 前記Si(111)基板は、0.01Ω・cm以下の体積抵抗率値を有し、
前記別の基板の最表面層は、Ni、Cr、Ti、Pd、Al、Cuから選択される一つ又は複数の元素を含む金属層を最表面層に備え、
前記第5の工程では、前記体積抵抗率値を有するSi(111)面と前記金属層の最表面とが接合される。
ことを特徴とする請求項1に記載の半導体薄膜素子の製造方法。 - 前記接合が少なくとも分子間力接合工程を含む工程によって形成されることを特徴とする請求項1又は請求項2に記載の半導体薄膜素子の製造方法。
- 前記バッファ層が、AlxGa1−xN(1≧x≧0)であり、
前記半導体単結晶層は、AlxGa1−xN(1≧x≧0)、InxGa1−xN(1≧x≧0)、AlxIn1−xN(1≧x≧0)から選択される半導体単結晶層の単層又は積層を備える
ことを特徴とする請求項1に記載の半導体薄膜素子の製造方法。 - 前記バッファ層は、SiとCとを含み、
前記半導体単結晶層が立方晶(3C−)SiC層を備える
ことを特徴とする請求項1乃至請求項3の何れか一項に記載の半導体薄膜素子の製造方法。 - 前記半導体単結晶層が前記立方晶SiC層に加えて、AlxGa1−xN(1≧x≧0)、InxGa1−xN(1≧x≧0)、AlxIn1−xN(1≧x≧0)から、選択される半導体単結晶層の単層又は積層を備える
ことを特徴とする請求項5に記載の半導体薄膜素子の製造方法。 - 前記バッファ層がSiとCを含み、
前記半導体単結晶層がAlxGal−xN(1≧x≧0)、InxGa1−xN(1≧x≧0)、AlxIn1−xN(1≧x≧0)から選択される半導体単結晶層の単層又は積層を備える
ことを特徴とする請求項1に記載の半導体薄膜素子の製造方法。 - Si(111)基板からエッチング剥離され、Si(111)面をその表裏とするSi(111)層とバッファ層と半導体単結晶層とが順次形成された積層体と、前記Si(111)基板と異なる別の基板とが、前記Si(111)層の裏面で接合されていることを特徴とする半導体ウエハ。
- 前記Si(111)層の体積抵抗率値は、0.01Ω・cm以下であり、
前記別の基板の最表面層は、Ni、Cr、Ti、Pd、Al、Cuから選択される一つ又は複数の元素を含む金属層であり、
前記体積抵抗率値を有するSi(111)層の裏面と前記金属層の最表面とが接合されている
ことを特徴とする請求項8に記載の半導体ウエハ。 - 前記接合が分子間力接合であることを特徴とする請求項8に記載の半導体ウエハ。
- 前記バッファ層は、AlxGa1−xN(1≧x≧0)であり、
前記半導体単結晶層は、AlxGa1−xN(1≧x≧0)、InxGa1−xN(1≧x≧0)、AlxIn1−xN(1≧x≧0)から選択される半導体単結晶層の単層又は積層を備える
ことを特徴とする請求項8に記載の半導体ウエハ。 - 前記バッファ層は、SiとCとを含み、
前記半導体単結晶層が立方晶(3C−)SiC層を備える
ことを特徴とする請求項8に記載の半導体ウエハ。 - 前記半導体単結晶層が前記立方晶SiC層に加えて、AlxGa1−xN(1≧x≧0)、InxGa1−xN(1≧x≧0)、AlxIn1−xN(1≧x≧0)から、選択される半導体単結晶層の単層又は積層を備える
ことを特徴とする請求項12に記載の半導体ウエハ。 - 前記バッファ層は、SiとCを含み、
前記半導体単結晶層は、AlxGal−xN(1≧x≧0)、InxGa1−xN(1≧x≧0)、AlxIn1−xN(1≧x≧0)から選択される半導体単結晶層の単層又は積層を備える
ことを特徴とする請求項8に記載の半導体ウエハ。 - Si(111)基板からエッチング剥離され、Si(111)面をその表裏とするSi(111)層の表面に、半導体素子を備えたSi以外の半導体材料の半導体単結晶層を備え、
前記Si(111)層の裏面を接合面として、前記Si(111)基板と異なる別の基板の表面又は前記別の基板の表面に設けられた接合層の表面に接合されている
ことを特徴とする半導体薄膜素子。 - 前記接合は、直接密着され接合し固定されている
ことを特徴とする請求項15に記載の半導体薄膜素子。 - 前記接合は、分子間力によって接合されている
ことを特徴とする請求項15に記載の半導体薄膜素子。 - 前記接合面のSi(111)層の体積抵抗率値は、0.01Ω・cm以下であり、
前記別の基板又は前記接合層の最表面層は、Ni、Cr、Ti、Pd、Al、Cuから選択される一つ又は複数の元素を含む金属層である
ことを特徴とする請求項15に記載の半導体薄膜素子。 - 前記半導体単結晶層の最上層に第1の電極を備え、
前記金属層を第2の電極として備える
ことを特徴とする請求項18に記載の半導体薄膜素子。 - 前記半導体単結晶層は、AlxGal−xN(1≧x≧0)、InxGa1−xN(1≧x≧0)、AlxIn1−xN(1≧x≧0)、及び、SiCから選択される半導体材料を一つ又は複数の半導体材料層を備える
ことを特徴とする請求項15に記載の半導体薄膜素子。
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