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    • 93. 发明公开
    • Hetero-junction bipolar transistor
    • 异相双极晶体管
    • EP0387010A3
    • 1990-10-10
    • EP90302391.9
    • 1990-03-06
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Inada, MasanoriRyoji, Akira
    • H01L29/73H01L29/62
    • H01L29/66318H01L21/28H01L29/7371
    • An object of the present invention is to suppress the surface recombination over the whole area of the external base of a hetero-junction bipolar transistor (HBT), to keep the current gain large, and to reduce the base contact resistance. The HBT of the invention has, as a surface protective film layer, a p-type semiconductor layer which has the higher portential of the energy conduction band than the base layer on an external base outside the junction between the mesa of the n-type emitter layer and the p-type base layer, and a base electrode thereon. Preferably, it has as a base contact layer a p-type semiconductor layer which shows reduced contact resistance with the base electrode on the surface protective layer comprising a p-type semiconductor layer. More preferabiy, it has a structure wherein a base electrode is formed on the base contact layer in contact with the projection part of the emitter electrode to the base contact layers A method of producing this HBT comprises at least the steps of forming an emitter mask on the portion to be an emitter on a multi-layer structure material having an n-type semiconductor layer for forming a collector, a p-type semiconductor layer or forming a base, and an n-type semiconductor layer for forming an emitter in this order from the substrate, and etching by using the emitter mask to form an emitter mesa and to expose a base layer; epitaxially forming as a surface protective film layer a p-type semiconductor layer which show the higher potential of the energy conduction band than the base layer on the external base outside the junction part between the emitter mesa and the base layer by using the emitter mask; and epitaxially forming a base electrode on the p-type surface protective film layer.
    • 97. 发明公开
    • Bipolar transistor and method of producing the same
    • Bipolarer晶体管和Sein Herstellungsverfahren。
    • EP0240307A2
    • 1987-10-07
    • EP87302784.1
    • 1987-03-31
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Inada, MasanoriEda, KazuoOta, YoritoNakagawa, AtsushiYanagihara, Manabu
    • H01L29/08H01L29/73
    • H01L29/66318H01L29/0804H01L29/41708H01L29/7371Y10S148/01Y10S148/072
    • A dummy emitter (a dummy collector, in inverted type) is formed in the portion corresponding to an emitter (a collector, in inverted type) region, on a multiplayer struc­tural material comprising layers for forming emitter, base and collector, and using it as mask, an external base region is exposed by etching, and a projection of emitter (collec­tor, in inverted type) region is formed, while the dummy emitter (the dummy collector, in inverted type) is inverted into an emitter (a collector, in inverted type) electrode, thereby forming an emitter (a collector, in inverted type) electrode metal layer to cover the whole upper surface of the emitter (the collector, in inverted type). Using thus formed emitter (collector, in inverted type) electrode metal layer, a base electrode metal layer is formed, by self-­alignment, adjacently to the emitter (the collector, in inverted type). In other method, on a multilayer structural material, impurities are introduced outside the portion corresponding to the base region of a bipolar transistor in order to insulate, at least, the layer to form the emitter, the layer to form the base, or at most, these layers and the layer to form the collector, and an extension type dummy emitter (dummy collector, in inverted type) extending from the emitter (collector, in inverted type) portion to the insulating region formed by transforming from the semicon­ductor material to form the emitter (the collector, in in­verted type), and using it as mask, the external base region is exposed to form a projection coupling the emitter region and insulating region, and the dummy emitter (the dummy collector, in inverted type) is inverted to transform into an emitter (a collector, in inverted type) electrode metal layer to cover the whole upper surface of the projection.
    • 在对应于发射器(集电极,倒置型)区域的部分中,在包括用于形成发射极,基极和集电极的层的多层结构材料上形成虚拟发射极(倒置型的虚设集电极),并将其用作 掩模,通过蚀刻暴露外部基极区域,并且形成发射极(集电极,倒置型)区域的突起,而虚拟发射极(反相型虚拟集电极)被反转为发射极(集电极, 反转型)电极,从而形成发射极(集电极,倒置型)电极金属层,以覆盖发射体(集电极,倒置型)的整个上表面。 使用如此形成的发射极(集电极,倒置型)电极金属层,通过自对准,与发射极(集电极,倒置型)相邻形成基极金属层。 在其他方法中,在多层结构材料上,杂质被引入到与双极晶体管的基极区域相对应的部分的外部,以便至少使层形成发射极,形成基底的层或至多绝缘层 ,这些层和形成集电极的层,以及从发射极(集电极,倒置型)部分延伸到通过从半导体材料转变形成的绝缘区域的延伸型虚拟发射极(倒置型的虚设集电极) 发射极(集电极,倒立型),并将其用作掩模,外部基极区域暴露以形成耦合发射极区域和绝缘区域的突起,并且虚拟发射极(倒置型的虚设集电极)被反转 转换为发射极(集电极,倒置型)电极金属层,以覆盖投影的整个上表面。