JP5385679B2 - 横方向半導体デバイスおよびその製造方法 - Google Patents
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Description
合計入力容量CISSは、以下の通りである:
CISS=CGS+CGD
入力容量が比較的高い場合、パワーMOSFETを動作させるためには比較的高いゲート電流が必要である。その結果、ゲートのスイッチング損失は、特に1MHzを超えるスイッチング周波数で大きくなる。これはゲート回路には関連せず、デバイス内での電力損失を考慮するだけであり、大きなCGDは、大きなスイッチング損失を生じることになる。
fINPUT=1/(2πCISSRG)
小さいCGDを有するデバイスは、低いスイッチング損失および高いカットオフ周波数を有することが分かる。
従って、標準CMOSプロセスと互換性を持つ製造技術を用いて小さいCGDを有することを示すデバイスが必要とされている。
一実施形態は、p型基板と、デバイス間を隔離するためのディープnウェルと、ソースとボディ領域のバッティングコンタクト(butting contact)とシャロートレンチアイソレーション(STI)と、STIの下に配置される表面電界緩和型(RESURF)nドリフト領域と、p型基板の基板面に平行に形成された水平ゲート電極部及び該水平ゲート電極部と断面視で垂直に交わるように形成された垂直ゲート電極部を有し、前記STIに埋め込まれたゲート電極とを備える横方向半導体デバイスを含む。
ton=fd+tri+tfv
ここで、
toff=tS+trv+tfi
ここで、
ピークダイオードリカバリーは、許容されたドレイン・ソース電圧(VDS)の最大の上昇率、すなわちdv/dt特性として定義される。この率を上回ると、ゲート・ソース端末にかかる電圧は、デバイスの閾値電圧より高くなり、デバイスを電流導通モードにし、一定の条件下で壊滅的な故障が生じる。dv/dt誘導されたターンオンの1つの機構は、ゲート・ドレイン間容量(CGD)のフィードバック動作によってアクティブになる。
VGS=I1・RG=RG・CGD・dv/dt
ゲート電圧VGS230がデバイスの閾値電圧Vthを上回ると、デバイスは、導通状態になる。
従って、この機構のdv/dt特性は、以下によって設定される。
dv/dt=Vth/(RG・CGD)
以上のように、小さいCGD225値により、大きいdv/dt特性が生じるので、従って、パワーMOSFETはより信頼性が高くなることが明らかである。
p型基板は、図5(a)の工程505で設けられる。次に、工程510において、フィールド酸化膜およびアクティブ領域のリソグラフィが行われ、続いて、工程520においてSTIアニーリングが行われる。次に、工程530のゲート・リソグラフィが行われ、次に、工程540のゲート酸化が行われる。次に、ポリシリコン堆積およびアニーリング542が行われる。次に、テトラエチルオルトシリケート(TEOS)酸化膜堆積、および工程545のコンタクト形成が行われ、次に、工程550のメタライゼーションが行われる。
STIアニーリングの後、nドリフト・イオン注入工程が行われると、工程は、交代順序で行われてもよいことに注意されたい。
STIアニーリングの後に、nドリフト・イオン注入工程が行われると、工程は、交代順序で行われてもよいことに注意されたい。
図8は、本発明の一実施形態によって構成された距離Aに対するBVおよび特定オン抵抗(Ron,sp)を例示するグラフ800である。直交EDMOSトランジスタの特定オン抵抗は、種々の横方向チャネル長A(図4の425)に対してシミュレーションされているが、その一方で、他の全てのパラメータを一定に保っている。Aによって寄与されるチャネル抵抗は、0.1μm当たり2mΩ・mm2である。
BV分析は、nドリフト領域がRESURF状態にある限り、降伏電圧が単純な関係、すなわち、
BV=Elat・Ldrift, Elat=10−15V/μm
に従う。ここで、Ldriftは、ドリフト領域の長さである。
Ron分析は、Ron,sp=Rsh・L2 drift,Rsh=4−5kΩ/sqを与え、これは、シート抵抗である。
直交ゲートは、一般的な降伏電圧に対して使用してもよい。30Vを超える降伏電圧EDMOSに対しては、ドリフト領域長は、直交ゲート領域の近傍を除いては増加されるべきで、その臨界電界は、依然として同じ10−15V/μmに保たれる。従って、OG−EDMOSは、Ron,spを低く保ちながら、いかなる降伏電圧EDMOSに対しても作用することができる。
Claims (4)
- 横方向半導体デバイスであって、
p型基板と、
デバイス間を隔離するためのディープnウェルと、
ソースとボディ領域のバッティングコンタクトと、
シャロートレンチアイソレーション(STI)と、
前記STIの下に配置される表面電界緩和型(RESURF)nドリフト領域と、
前記p型基板の基板面に平行に形成された水平ゲート電極部及び該水平ゲート電極部と断面視で垂直に交わるように形成された垂直ゲート電極部を有し、前記STIに埋め込まれたゲート電極と、
を備えた横方向半導体デバイス。 - 高耐圧pウェルをさらに備え、
前記ディープnウェルは、前記p型基板と前記高耐圧pウェルとの間に配置される請求項1に記載の横方向半導体デバイス。 - 前記nドリフト領域は、前記STIの端部まで形成されている請求項1又は請求項2に記載の横方向半導体デバイス。
- 請求項2に記載の横方向半導体デバイスを製造する方法であって、
前記ディープnウェル上に配置される前記高耐圧pウェルを形成する高耐圧pウェル・イオン注入工程と、
前記nドリフト領域上に配置され、且つ前記高耐圧pウェルに隣接する前記STIを形成するSTI形成工程と、
前記STIをドライエッチングしてトレンチを形成するトレンチ形成工程と、
前記高耐圧pウェル表面並びに前記トレンチの該高耐圧pウェル側の側部及び底部にゲート酸化膜を成長させるゲート酸化工程と、
前記ゲート酸化膜を介して、前記高耐圧pウェル表面上及び前記トレンチの中にゲートポリシリコン膜を堆積するゲートポリシリコン膜堆積工程と、
ゲート・リソグラフィを用いて、前記ゲートポリシリコン膜から前記ゲート電極を形成するゲート電極形成工程と、
を含むことを特徴とする横方向半導体デバイスを製造する方法。
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