JP6649586B2 - 化合物半導体装置及びその製造方法 - Google Patents
化合物半導体装置及びその製造方法 Download PDFInfo
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- JP6649586B2 JP6649586B2 JP2016137828A JP2016137828A JP6649586B2 JP 6649586 B2 JP6649586 B2 JP 6649586B2 JP 2016137828 A JP2016137828 A JP 2016137828A JP 2016137828 A JP2016137828 A JP 2016137828A JP 6649586 B2 JP6649586 B2 JP 6649586B2
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Description
先ず、第1の実施形態について説明する。第1の実施形態はHEMTを備えた化合物半導体装置の一例に関する。図1は、第1の実施形態に係る化合物半導体装置の構造を示す断面図である。
次に、第2の実施形態について説明する。第2の実施形態はGaN系HEMTを備えた化合物半導体装置の一例である。図3は、第2の実施形態に係る化合物半導体装置の構造を示す断面図である。
次に、第3の実施形態について説明する。第3の実施形態はGaN系HEMTを備えた化合物半導体装置の一例である。図6は、第3の実施形態に係る化合物半導体装置の構造を示す断面図である。
次に、第4の実施形態について説明する。第4の実施形態は、HEMTのディスクリートパッケージに関する。図8は、第4の実施形態に係るディスクリートパッケージを示す図である。
次に、第5の実施形態について説明する。第5の実施形態は、HEMTを備えたPFC(Power Factor Correction)回路に関する。図9は、第5の実施形態に係るPFC回路を示す結線図である。
次に、第6の実施形態について説明する。第6の実施形態は、HEMTを備えた電源装置に関する。図10は、第6の実施形態に係る電源装置を示す結線図である。
次に、第7の実施形態について説明する。第7の実施形態は、HEMTを備えた増幅器に関する。図11は、第7の実施形態に係る増幅器を示す結線図である。
キャリア走行層と、
前記キャリア走行層上方のキャリア供給層と、
前記キャリア供給層上方のソース電極及びドレイン電極と、
前記ソース電極と前記ドレイン電極との間で前記キャリア供給層上方のゲート電極と、
前記ゲート電極と前記ドレイン電極との間で前記キャリア供給層上方の第1の絶縁膜、第2の絶縁膜及び第3の絶縁膜と、
を有し、
前記ゲート電極は、前記第3の絶縁膜上の部分を有し、
前記第1の絶縁膜中の電子トラップの濃度は、前記第2の絶縁膜中の電子トラップの濃度よりも高く、
前記第3の絶縁膜中の電子トラップの濃度は、前記第2の絶縁膜中の電子トラップの濃度よりも高いことを特徴とする化合物半導体装置。
前記第1の絶縁膜は第1の酸化アルミニウム膜であり、
前記第3の絶縁膜は第2の酸化アルミニウム膜であり、
前記第2の酸化アルミニウム膜中の酸素原子のうち、Al−O−Alの結合状態を構成する酸素原子の数に対する水酸化アルミニウムに含まれる酸素原子の数の比率は、前記第1の酸化アルミニウム膜中の酸素原子のうち、Al−O−Alの結合状態を構成する酸素原子の数に対する水酸化アルミニウムに含まれる酸素原子の数の比率よりも高いことを特徴とする付記1に記載の化合物半導体装置。
前記第3の絶縁膜は、平面視で前記第1の絶縁膜よりも前記ドレイン電極側に延在していることを特徴とする付記1又は2に記載の化合物半導体装置。
前記第3の絶縁膜は前記第1の絶縁膜の側方の部分を有することを特徴とする付記3に記載の化合物半導体装置。
前記第2の絶縁膜は、窒化シリコン膜若しくは酸窒化シリコン膜又はこれらの両方を有することを特徴とする付記1乃至4のいずれか1項に記載の化合物半導体装置。
付記1乃至5のいずれか1項に記載の化合物半導体装置を有することを特徴とする電源装置。
付記1乃至5のいずれか1項に記載の化合物半導体装置を有することを特徴とする増幅器。
キャリア走行層上方にキャリア供給層を形成する工程と、
前記キャリア供給層上方にソース電極及びドレイン電極を形成する工程と、
前記ソース電極と前記ドレイン電極との間で前記キャリア供給層上方にゲート電極を形成する工程と、
前記ゲート電極と前記ドレイン電極との間で前記キャリア供給層上方に第1の絶縁膜、第2の絶縁膜及び第3の絶縁膜を形成する工程と、
を有し、
前記ゲート電極は、前記第3の絶縁膜上の部分を有し、
前記第1の絶縁膜中の電子トラップの濃度は、前記第2の絶縁膜中の電子トラップの濃度よりも高く、
前記第3の絶縁膜中の電子トラップの濃度は、前記第2の絶縁膜中の電子トラップの濃度よりも高いことを特徴とする化合物半導体装置の製造方法。
前記第1の絶縁膜は第1の酸化アルミニウム膜であり、
前記第3の絶縁膜は第2の酸化アルミニウム膜であり、
前記第2の酸化アルミニウム膜中の酸素原子のうち、Al−O−Alの結合状態を構成する酸素原子の数に対する水酸化アルミニウムに含まれる酸素原子の数の比率は、前記第1の酸化アルミニウム膜中の酸素原子のうち、Al−O−Alの結合状態を構成する酸素原子の数に対する水酸化アルミニウムに含まれる酸素原子の数の比率よりも高いことを特徴とする付記8に記載の化合物半導体装置の製造方法。
前記第3の絶縁膜は、平面視で前記第1の絶縁膜よりも前記ドレイン電極側に延在していることを特徴とする付記8又は9に記載の化合物半導体装置の製造方法。
前記第3の絶縁膜は前記第1の絶縁膜の側方の部分を有することを特徴とする付記10に記載の化合物半導体装置の製造方法。
前記第2の絶縁膜は、窒化シリコン膜若しくは酸窒化シリコン膜又はこれらの両方を有することを特徴とする付記8乃至11のいずれか1項に記載の化合物半導体装置の製造方法。
101、201:キャリア走行層
102、202:キャリア供給層
103、203:ソース電極
104、204:ドレイン電極
105、205:ゲート電極
106、206:庇状の部分
107、207:第1の絶縁膜
108、208:第2の絶縁膜
109、209、309:第3の絶縁膜
Claims (8)
- キャリア走行層と、
前記キャリア走行層上方のキャリア供給層と、
前記キャリア供給層上方のソース電極及びドレイン電極と、
前記ソース電極と前記ドレイン電極との間で前記キャリア供給層上方のゲート電極と、
前記ゲート電極と前記ドレイン電極との間で前記キャリア供給層上方の第1の絶縁膜、第2の絶縁膜及び第3の絶縁膜と、
を有し、
前記ゲート電極は、前記第3の絶縁膜上の部分を有し、
前記第1の絶縁膜中の電子トラップの濃度は、前記第2の絶縁膜中の電子トラップの濃度よりも高く、
前記第3の絶縁膜中の電子トラップの濃度は、前記第2の絶縁膜中の電子トラップの濃度よりも高いことを特徴とする化合物半導体装置。 - 前記第1の絶縁膜は第1の酸化アルミニウム膜であり、
前記第3の絶縁膜は第2の酸化アルミニウム膜であり、
前記第2の酸化アルミニウム膜中の酸素原子のうち、Al−O−Alの結合状態を構成する酸素原子の数に対する水酸化アルミニウムに含まれる酸素原子の数の比率は、前記第1の酸化アルミニウム膜中の酸素原子のうち、Al−O−Alの結合状態を構成する酸素原子の数に対する水酸化アルミニウムに含まれる酸素原子の数の比率よりも高いことを特徴とする請求項1に記載の化合物半導体装置。 - 前記第3の絶縁膜は、平面視で前記第1の絶縁膜よりも前記ドレイン電極側に延在していることを特徴とする請求項1又は2に記載の化合物半導体装置。
- 前記第3の絶縁膜は前記第1の絶縁膜の側方の部分を有することを特徴とする請求項3に記載の化合物半導体装置。
- 前記第2の絶縁膜は、窒化シリコン膜若しくは酸窒化シリコン膜又はこれらの両方を有することを特徴とする請求項1乃至4のいずれか1項に記載の化合物半導体装置。
- 請求項1乃至5のいずれか1項に記載の化合物半導体装置を有することを特徴とする電源装置。
- 請求項1乃至5のいずれか1項に記載の化合物半導体装置を有することを特徴とする増幅器。
- キャリア走行層上方にキャリア供給層を形成する工程と、
前記キャリア供給層上方にソース電極及びドレイン電極を形成する工程と、
前記ソース電極と前記ドレイン電極との間で前記キャリア供給層上方にゲート電極を形成する工程と、
前記ゲート電極と前記ドレイン電極との間で前記キャリア供給層上方に第1の絶縁膜、第2の絶縁膜及び第3の絶縁膜を形成する工程と、
を有し、
前記ゲート電極は、前記第3の絶縁膜上の部分を有し、
前記第1の絶縁膜中の電子トラップの濃度は、前記第2の絶縁膜中の電子トラップの濃度よりも高く、
前記第3の絶縁膜中の電子トラップの濃度は、前記第2の絶縁膜中の電子トラップの濃度よりも高いことを特徴とする化合物半導体装置の製造方法。
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