JPWO2015178024A1 - 炭化珪素半導体装置 - Google Patents
炭化珪素半導体装置 Download PDFInfo
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- JPWO2015178024A1 JPWO2015178024A1 JP2016520942A JP2016520942A JPWO2015178024A1 JP WO2015178024 A1 JPWO2015178024 A1 JP WO2015178024A1 JP 2016520942 A JP2016520942 A JP 2016520942A JP 2016520942 A JP2016520942 A JP 2016520942A JP WO2015178024 A1 JPWO2015178024 A1 JP WO2015178024A1
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- silicon carbide
- gate
- carbide semiconductor
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 176
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 137
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- 238000003763 carbonization Methods 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
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Abstract
Description
図1、図2及び図3を参照しながら、本実施形態の炭化珪素装置の実施形態を説明する。図1Aは本実施形態の炭化珪素半導体装置100(以下、SiC−MOSFET100と呼ぶ)、を半導体基板の主面側から見た模式的平面図である。図2は図1Aに示すI―I線における模式的断面図であり、図3は図1Aに示すII−II線における模式的断面図である。
本実施形態のSiC−MOSFET100は、積層構造200を備える。積層構造200は、n+型のSiC基板(半導体基板)101と、SiC半導体基板101の主面に位置するドリフト層(第1炭化珪素半導体層)102と、SiC半導体基板101の裏面に位置するドレイン電極(第1オーミック電極)110とを備える。
次にSiC−MOSFET100の動作を説明する。
図4Aから図6Dを参照しながら、本実施形態の半導体装置の製造方法の一例を説明する。なお、以下で説明している特定の数値、材料、プロセス条件は、一例であり、本発明を以下の製造方法のみに限定するものではない。
d=30nm
次いで、炭化珪素半導体層106Aの所定部位をドライエッチングした後、例えば熱酸化によって、図5Bに示したようにエッチングされた後に残された炭化珪素半導体層106Aの表面にゲート絶縁膜107及び絶縁膜117を同時に形成する。ゲート絶縁膜107はトランジスタ領域100Tに位置し、絶縁膜117はダイオード領域100Dに位置する。熱酸化によりゲート絶縁膜107および絶縁膜117を形成した場合は炭化珪素半導体層106Aの一部はゲート絶縁膜107および絶縁膜117になってしまう。このため、熱酸化により消失する厚さを考慮し、ゲート絶縁膜107および絶縁膜117形成後に上記厚さdになるよう、形成する炭化珪素半導体層106Aの厚さを調整する。例えば、dに対して炭化珪素半導体層106Aを約50nm程度厚く形成する。ゲート絶縁膜形成前の炭化珪素半導体層106Aの清浄化工程と、ゲート絶縁膜形成工程を経て、ゲート絶縁膜107及び絶縁膜117形成後の炭化珪素半導体層106Aは、厚さdを有する。
図9を参照しながら本実施形態の半導体装置の変形例1を説明する。
図10を参照しながら本実施形態の半導体装置の変形例2を説明する。
図12を参照しながら、本実施形態の半導体装置の変形例3を説明する。
図13を参照しながら、本実施形態の半導体装置の変形例4を説明する。外部との接続を行うゲートパッド領域100GPはゲート配線領域100GL部と比較して第2のウェル領域115が広い。変位電流は第2のウェル領域115の面積に応じて流れるため、第2のウェル領域115上に薄い絶縁膜が単独で存在するときには、第2のウェル領域115は狭い方が好ましい。本変形例4のSiC−MOSFET1200は、ゲートパッド領域1200GPにおいて、ゲートパッド領域1200GPの第2のウェル領域1215が分割されていることを特徴としている。この構造により、薄い絶縁膜のみが存在する第2のウェル領域の面積を小さくすることができ、ゲートパッド領域1200GPにおける絶縁膜117の破壊を抑制することが出来る。
図14A、図14B、図15Aおよび図15Bを参照しながら、本実施形態の半導体装置の変形例5を説明する。
100T,100TA トランジスタ領域
100Da,100Db,100Dc ダイオード領域
100GP,1100GP,1200GP ゲートパッド領域
100GL ゲート配線領域
100E 終端領域
101,1601,1701 半導体基板
102,1602,1702 第1炭化珪素半導体層(ドリフト層)
103,1603,1703 第1のウェル領域
104,1604 ソース領域
105, 第1のコンタクト領域
106 第2炭化珪素半導体層(チャネル層)
107,1607,1707 ゲート絶縁膜
108,1608,1708 ゲート電極
109 ソース電極
110 ドレイン電極
111 層間絶縁膜
111c,111d,111g コンタクトホール
112 上部電極
112L ソース配線
113 裏面配線電極
114 ゲートパッド
114L ゲート配線
115,1215,1215a,1215b,1615,1717a 第2のウェル領域
116,1216a,1216b,1616 第2のコンタクト領域
117,1617,1716 絶縁膜
118 第2炭化珪素半導体層(エピタキシャル層)
119 ベース電極
120 リング領域
Claims (8)
- 第1導電型の半導体基板と、前記半導体基板の主面上に位置する第1導電型の第1炭化珪素半導体層と、前記半導体基板の裏面に位置する第1のオーミック電極とを備え、前記半導体基板の一部、前記第1炭化珪素半導体層の一部および前記第1のオーミック電極の一部をそれぞれ含むトランジスタ領域、終端領域およびダイオード領域を含む積層構造であって、前記半導体基板の前記主面に垂直な方向からみて、前記終端領域が前記トランジスタ領域を囲み、前記ダイオード領域が前記終端領域と前記終端領域との間に位置している積層構造を備えた炭化珪素半導体装置であって、
前記トランジスタ領域は複数のユニットセル領域を含み、
前記炭化珪素半導体装置は、
各ユニットセル領域において、
前記第1炭化珪素半導体層の一部内に位置する第2導電型の第1のウェル領域と、
前記第1のウェル領域内に位置する第1導電型のソース領域と、
前記第1炭化珪素半導体層の一部上であって、前記第1のウェル領域と、前記ソース領域の少なくとも一部にそれぞれ接して配置されており、少なくとも前記第1炭化珪素半導体層よりも不純物濃度が低い第1導電型の層を含む第2炭化珪素半導体層と、
前記第2炭化珪素半導体層上のゲート絶縁膜と、
前記ゲート絶縁膜上に位置するゲート電極と、
前記ソース領域と電気的に接続された第2のオーミック電極と、
前記第2のオーミック電極に電気的に接続された上部電極と、
を備え、
前記ダイオード領域において、
前記第1炭化珪素半導体層の一部内に位置する第2導電型の第2のウェル領域と、
前記第2のウェル領域内に位置する第2のウェル領域よりも不純物濃度の高いコンタクト領域と、
前記第1炭化珪素半導体層の一部上であって、前記コンタクト領域の少なくとも一部に接して配置された第2炭化珪素半導体層と、
前記第2炭化珪素半導体層上であって、前記ゲート絶縁膜と概略同じ厚さを有する絶縁膜と、
前記絶縁膜の少なくとも一部上に設けられたゲート電極と、
前記コンタクト領域上に位置し、前記ゲート電極と電気的に接続されたゲート配線と、
前記コンタクト領域上に位置し、前記ゲート配線と電気的に接続され、外部との接続をするためのゲートパッドと、
前記コンタクト領域内の、少なくとも前記ゲート配線と前記トランジスタ領域との間に位置する領域、および、前記ゲート配線と前記終端領域との間に位置する領域にそれぞれ電気的に接続された第3のオーミック電極と、
前記第3のオーミック電極および前記各ユニットセル領域の前記上部電極と電気的に接続されたソース配線と
を備え、
前記終端領域において、
前記第1炭化珪素半導体層の一部内に位置する第2導電型の不純物領域を備える炭化珪素半導体装置。 - 前記ダイオード領域の前記ゲート配線と前記終端領域の間において、前記トランジスタ領域のユニットセル領域と同じ構造を有する少なくとも1つのユニットセルをさらに備える請求項1に記載の炭化珪素半導体装置。
- 前記積層構造は、前記半導体基板の前記主面に垂直な方向からみて概ね四角形の形状を有し、
前記四角形の4つの角のうち、前記ゲートパッドにより近い2つの角における終端領域の耐圧は、他の2つの角の少なくとも1つにおける終端領域の耐圧よりも高い請求項1または2に記載の炭化珪素半導体装置。 - 前記終端領域において、前記不純物領域はFLRを構成しており、
前記ゲートパッドにより近い2つの角における前記不純物領域の半径は、前記他の2つの角の少なくとも1つにおける前記不純物領域の半径よりも大きい請求項3に記載の炭化珪素半導体装置。 - 前記終端領域において、前記不純物領域はFLR構造を構成し、
前記ゲートパッドにより近い2つの角における前記不純物領域の幅は、前記他の2つの角の少なくとも1つにおける前記不純物領域の幅よりも大きい請求項3に記載の炭化珪素半導体装置。 - 前記ダイオード領域の、前記ゲート配線と前記トランジスタ領域との間に複数の前記第3のオーミック電極を有し、
前記複数の第3のオーミック電極は、前記半導体基板の前記主面に垂直な方向からみて四角形または円形の形状を有し、
前記複数の第3のオーミック電極のうち、前記第2のウェル領域の角部に最も近接する第3のオーミック電極は、これに隣接する第3のオーミック電極より大きい面積を有する請求項1から5のいずれかに記載の炭化珪素半導体装置。 - 前記ダイオード領域の、前記ゲート配線と前記トランジスタ領域との間に位置する複数の前記第3のオーミック電極を有し、前記複数の第3のオーミック電極は、前記半導体基板の前記主面に垂直な方向からみてストライプ形状を有し、
前記ストライプの幅は、前記第2のウェル領域の角部で最大となる請求項1から5のいずれかに記載の炭化珪素半導体装置。 - 前記ダイオード領域において、前記第2のウェル領域は複数に分割されており、
前記分割された複数の第2のウェル領域間の間隔は、前記分割された複数の第2のウェル領域と前記第1のウェル領域との間隔と同等またはそれ以下である請求項1から7のいずれかに記載の炭化珪素半導体装置。
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