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    • 10. 发明授权
    • Heterojunction bipolar transistor
    • 异质结双极晶体管
    • US5962880A
    • 1999-10-05
    • US892673
    • 1997-07-14
    • Katsuya OdaEiji OhueTakahiro OnaiKatsuyoshi Washio
    • Katsuya OdaEiji OhueTakahiro OnaiKatsuyoshi Washio
    • H01L21/331H01L29/10H01L29/737
    • H01L29/66242H01L29/1004H01L29/7378
    • A self-aligned bipolar transistor which has a small base resistance and small emitter-base and collector-base capacitances and is operable at high speed is disclosed. This bipolar transistor is characterized in that a low concentration collector region made of single crystal Si--Ge is self-alignedly formed between an intrinsic base of single crystal Si--Ge and an intrinsic base, and that an extrinsic base electrode and an intrinsic base are connected only through a doped external base. With this arrangement, an energy barrier is not established at the collector base interface owing to the formation of the low concentration region of single crystal Si--Ge, so that the transit time of the carriers charged from the emitter is shortened. The connection between the intrinsic base and the extrinsic base electrode via the doped external base results in the reduction of the base resistance. In addition, the self-aligned formation of the emitter-base-collector leads to the reduction in capacitance between the emitter and the base and also between the collector and the base. Accordingly, a high-speed bipolar transistor can be realized and thus, circuits using the transistor are operable at high speed.
    • 公开了具有小的基极电阻和小的发射极基极和集电极基极电容并且可高速操作的自对准双极晶体管。 该双极型晶体管的特征在于,由单晶Si-Ge构成的低浓度集电极区域在单晶Si-Ge的本征基极和本征基极之间自对准地形成,而外部基极电极和固有基极为 仅通过掺杂的外部基极连接。 通过这种布置,由于形成单晶Si-Ge的低浓度区域,在集电极基极界面处没有形成能量势垒,从而缩短了从发射极充电的载流子的渡越时间。 通过掺杂的外部基极的本征基极和外部基极之间的连接导致基极电阻的降低。 此外,发射极 - 基极集电体的自对准形成导致发射极和基极之间以及集电极和基极之间的电容减小。 因此,可以实现高速双极晶体管,因此,使用晶体管的电路可以高速工作。