NITRIDE SEMICONDUCTOR DEVICE, DIODE AND FIELD EFFECT TRANSISTOR
PROBLEM TO BE SOLVED: To keep parasitic capacitance due to wiring low wile ensuring a wiring width and improve switching characteristics while maintaining high voltage withstanding and a high current.SOLUTION: A nitride semiconductor device comprises: a buffer layer 12, an electron transit layer 13...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To keep parasitic capacitance due to wiring low wile ensuring a wiring width and improve switching characteristics while maintaining high voltage withstanding and a high current.SOLUTION: A nitride semiconductor device comprises: a buffer layer 12, an electron transit layer 13 and an electron supply layer 14 which are provided on a substrate 11; a 2DEG layer a generated at an interface of the electron transit layer 13 with the electron supply layer 14; a cathode electrode 18 and cathode wiring 19 which are selectively stacked on the electron supply layer 14; a 2DEG non-generating region 13a provided on the cathode electrode 18 part, for inhibiting generation of 2DEG; an anode electrode 16 which forms Schottky contacts with the 2DEG layer a in a lower layer of the field plate layer 15 and the electron supply layer 14 from lateral faces to ground the 2DEG layer a; and a dielectric layer 21 provided so as to cover the 2DEG non-generating region 13a while ensuring a contact part 21a. The cathode electrode 18 forms ohmic contact with the 2DEG layer a through the contact part 21a while covering the dielectric layer 21.
【課題】配線幅を確保しつつ配線による寄生容量を低く抑えて、高耐圧かつ大電流を維持しつつスイッチング特性を向上させること。【解決手段】基板11にバッファ層12、電子走行層13、電子供給層14を設ける。電子走行層13の電子供給層14との界面に2DEG層aが生じる。電子供給層14上に選択的にカソード電極18およびカソード配線19を積層する。カソード電極18部分に、2DEGの発生を抑制する2DEG非発生領域13aを設ける。アノード電極16は、フィールドプレート層15および電子供給層14の下層の2DEG層aに側面からショットキー接触し、接地させる。コンタクト部21aを確保しつつ2DEG非発生領域13aを覆うように誘電体層21を設ける。カソード電極18は誘電体層21を覆いつつ、コンタクト部21aを通じて2DEG層aとオーミック接触する。【選択図】図2 |
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