JP7353925B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7353925B2 JP7353925B2 JP2019203639A JP2019203639A JP7353925B2 JP 7353925 B2 JP7353925 B2 JP 7353925B2 JP 2019203639 A JP2019203639 A JP 2019203639A JP 2019203639 A JP2019203639 A JP 2019203639A JP 7353925 B2 JP7353925 B2 JP 7353925B2
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 21
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- UXBCHMIKTYBYTN-LQPTXBPRSA-N (3s,8s,9s,10r,13r,14s,17r)-3-[12-(3-iodophenyl)dodecoxy]-10,13-dimethyl-17-[(2r)-6-methylheptan-2-yl]-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1h-cyclopenta[a]phenanthrene Chemical compound O([C@@H]1CC2=CC[C@H]3[C@@H]4CC[C@@H]([C@]4(CC[C@@H]3[C@@]2(C)CC1)C)[C@H](C)CCCC(C)C)CCCCCCCCCCCCC1=CC=CC(I)=C1 UXBCHMIKTYBYTN-LQPTXBPRSA-N 0.000 description 1
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Description
<半導体装置の構造>
以下に図1~図4を用いて、実施の形態1における半導体装置(半導体チップ)を説明する。図1は、半導体装置を示す断面図であり、図2および図3は、半導体装置を示す平面図である。図2には、半導体層2の上方に形成された各電極の位置が示され、図3には、半導体層2の内部に形成された各不純物領域の位置が示されている。実施の形態1における半導体装置は、スイッチング素子であるMISFET1Qおよび整流素子であるJFET2Qを有し、図4には、MISFET1QおよびJFET2Qの等価回路が示されている。
以下に図9~図11を用いて、本願発明者らが検討を行った検討例1~3における半導体装置について説明する。なお、検討例1~3の半導体装置は、上記特許文献1~3に開示された技術を基にしている。
図9に示されるように、検討例1のMISFETの構造は、実施の形態1のMISFET1Qの構造とほぼ同様であるが、ゲート電極8の側面8b側には電界緩和層FRLを有さないJFET3Qが設けられ、ゲート電極8の側面8a側(ソース領域6側)にはJFET4Qが設けられている。
図10に示されるように、検討例2では、ゲート電極8の側面8b側には電界緩和層FRLが形成されておらず、ゲート電極8下のボディ領域4の表面に、低濃度不純物領域15が形成されている。検討例2のMISFETは、ソース電極11からドレイン電極13へユニポーラ電流を流すチャネルダイオード5Qとして機能する。
図11に示されるように、検討例3のMISFETの構造は、実施の形態1のMISFET1Qの構造とほぼ同様であるが、ゲート電極8の側面8b側には、電界緩和層FRLが形成されていない。その代わりに、半導体層2とソース電極11との間に金属層16が形成され、ショットキーバリアダイオード(Schottky Barrier Diode:SBD)6Qが設けられている。
以下に図12を用いて、実施の形態2における半導体装置を説明する。なお、以下の説明では、主に実施の形態1との相違点を説明する。
以下に図13を用いて、実施の形態3における半導体装置を説明する。なお、以下の説明では、主に実施の形態1および実施の形態2との相違点を説明する。
以下に図14~図16を用いて、実施の形態4における半導体装置を説明する。なお、以下の説明では、主に実施の形態2との相違点を説明する。図14は、実施の形態4における半導体装置を示す斜視図である。図15は、図14のA-A線に沿った断面図であり、図16は、図14のB-B線に沿った断面図である。
2 半導体層(エピタキシャル層)
3 拡散領域(不純物領域)
4 ボディ領域(不純物領域)
5 コンタクト領域(不純物領域)
6 ソース領域(不純物領域)
7 ゲート絶縁膜
8 ゲート電極
8a、8b 側面
9 層間絶縁膜
10 シリサイド層
11 ソース電極
12 シリサイド層
13 ドレイン電極
14 電流拡散領域(不純物領域)
15 低濃度不純物領域
16 金属層
1Q MISFET
2Q、3Q、4Q JFET
5Q チャネルダイオード
6Q ショットキーバリアダイオード
CH チャネル領域
DL 空乏層
FRL 電界緩和層(不純物領域)
TR トレンチ
Vd ドレイン電圧
Vf 立ち上がり電圧
Vg ゲート電圧
Vs ソース電圧
Vth 閾値電圧
Claims (13)
- 表面および前記表面と反対側の裏面を有し、且つ、炭化珪素からなる第1導電型の半導体基板と、
前記半導体基板の前記表面上に形成され、且つ、炭化珪素からなる前記第1導電型の第1半導体層と、
前記第1半導体層内に形成された、前記第1導電型と反対の第2導電型のボディ領域と、
前記ボディ領域上に形成されたゲート絶縁膜と、
前記ゲート絶縁膜上に形成され、第1側面および第1方向において前記第1側面と反対側の第2側面を有し、且つ、平面視において前記第1方向と直交する第2方向に延在するゲート電極と、
前記ゲート電極の前記第1側面側において、前記ボディ領域内に形成された前記第1導電型のソース領域と、
前記ボディ領域上および前記ソース領域上に形成され、且つ、前記ボディ領域および前記ソース領域に電気的に接続されたソース電極と、
前記半導体基板の前記裏面側に形成されたドレイン電極と、
を有し、
前記ゲート電極の前記第2側面側において、前記第1半導体層内には、前記第2導電型の電界緩和層が形成され、
前記ソース電極は、前記電界緩和層上にも形成され、且つ、前記電界緩和層に電気的に接続され、
前記電界緩和層の深さは、前記ボディ領域の深さよりも浅く、
前記電界緩和層と前記ソース電極との間には、前記第1半導体層に含まれる材料および第1金属からなる第1金属化合物層が形成され、
前記第1方向において、前記電界緩和層は、前記ボディ領域と離間し、前記第1金属化合物層の中央部を開口し、且つ、前記第1金属化合物層の端部を覆うように形成されている、半導体装置。 - 請求項1に記載の半導体装置において、
前記ボディ領域、前記ゲート絶縁膜、前記ゲート電極、前記ソース領域、および、前記ゲート電極の前記第2側面側の前記第1半導体層を含むMISFETと、前記電界緩和層、前記電界緩和層上の前記ソース電極、および、前記ゲート電極の前記第2側面側の前記第1半導体層を含む整流素子と、によってセルが構成され、
互いに隣接する2つの前記セルでは、前記第1金属化合物層の中央部を軸として、前記ボディ領域、前記ゲート絶縁膜、前記ゲート電極、前記ソース領域および前記電界緩和層が、線対称に設けられ、
線対称に設けられた2つの前記セルをユニットセルとした場合、複数の前記ユニットセルが、前記第1方向において周期的に設けられている、半導体装置。 - 請求項1に記載の半導体装置において、
前記ボディ領域、前記ゲート絶縁膜、前記ゲート電極、前記ソース領域、および、前記ゲート電極の前記第2側面側の前記第1半導体層を含むMISFETと、前記電界緩和層、前記電界緩和層上の前記ソース電極、および、前記ゲート電極の前記第2側面側の前記第1半導体層を含む整流素子と、によってセルが構成され、
互いに隣接する2つの前記セルでは、前記第1金属化合物層の中央部を軸として、前記ボディ領域、前記ゲート絶縁膜、前記ゲート電極、前記ソース領域および前記電界緩和層が、線対称に設けられ、
線対称に設けられた2つの前記セルをユニットセルとした場合、複数の前記ユニットセルが、前記第1方向において周期的に設けられている、半導体装置。 - 請求項3に記載の半導体装置において、
線対称に設けられた2つの前記セルの各々の前記電界緩和層の間隔は、1000nm以下である、半導体装置。 - 請求項1に記載の半導体装置において、
前記ボディ領域、前記ゲート絶縁膜、前記ゲート電極、前記ソース領域、および、前記ゲート電極の前記第2側面側の前記第1半導体層を含むMISFETと、前記電界緩和層、前記電界緩和層上の前記ソース電極、および、前記ゲート電極の前記第2側面側の前記第1半導体層を含む整流素子と、によってセルが構成され、
それぞれ同一構造の複数の前記セルが、前記第1方向において周期的に設けられている、半導体装置。 - 請求項5に記載の半導体装置において、
前記電界緩和層は、隣接する前記セルの前記ソース領域に接し、且つ、隣接する前記セルの前記ボディ領域と、前記第1方向および前記第2方向と直交する第3方向において離間している、半導体装置。 - 請求項1に記載の半導体装置において、
前記ボディ領域および前記ゲート電極の前記第2側面側の前記第1半導体層には、前記第1導電型の電流拡散領域が形成され、
前記ソース領域および前記電流拡散領域を貫通するように、前記ボディ領域には、トレンチが形成され、
前記ゲート絶縁膜および前記ゲート電極は、前記トレンチの内部にも形成され、
前記第1方向における前記トレンチの一方の側壁は、前記ソース領域に接し、
前記第1方向における前記トレンチの他方の側壁は、前記電流拡散領域に接し、
前記トレンチの底壁は、前記ボディ領域に接し、
前記電界緩和層は、前記電流拡散領域の上方に位置し、且つ、前記第1方向における前記トレンチの他方の側壁に接している、半導体装置。 - 請求項7に記載の半導体装置において、
前記第1方向において、前記電界緩和層は、前記第1金属化合物層の中央部を開口し、且つ、前記第1金属化合物層の端部を覆うように形成されている、半導体装置。 - 請求項8に記載の半導体装置において、
前記ボディ領域、前記ゲート絶縁膜、前記ゲート電極、前記ソース領域、前記ゲート電極の前記第2側面側の前記第1半導体層、および、前記電流拡散領域を含むMISFETと、前記電界緩和層、前記電界緩和層上の前記ソース電極、および、前記ゲート電極の前記第2側面側の前記第1半導体層を含む整流素子と、によってセルが構成され、
互いに隣接する2つの前記セルでは、前記第1金属化合物層の中央部を軸として、前記ボディ領域、前記ゲート絶縁膜、前記ゲート電極、前記ソース領域、前記電界緩和層および前記電流拡散領域が、線対称に設けられ、
線対称に設けられた2つの前記セルをユニットセルとした場合、複数の前記ユニットセルが、前記第1方向において周期的に設けられている、半導体装置。 - 請求項7に記載の半導体装置において、
前記第2方向において互いに隣接するように、前記ボディ領域には、複数の前記トレンチが設けられている、半導体装置。 - 請求項1に記載の半導体装置において、
前記電界緩和層の深さは、前記ボディ領域の深さの半分以下である、半導体装置。 - 請求項1に記載の半導体装置において、
前記電界緩和層の深さは、300nm以下である、半導体装置。 - 請求項1に記載の半導体装置において、
前記第1金属化合物層は、ニッケルシリサイドである、半導体装置。
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