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    • 7. 发明授权
    • Power converter
    • 电源转换器
    • US08248042B2
    • 2012-08-21
    • US13336621
    • 2011-12-23
    • Tatsuo Morita
    • Tatsuo Morita
    • G05F1/00H02M7/5387
    • H01L29/7787H01L27/0617H01L27/088H01L29/0692H01L29/0696H01L29/1066H01L29/2003H01L29/402H01L29/41758H01L29/423H01L29/432H02M7/003Y02B70/1483
    • A power converter includes an input terminal configured to be connected to a power supply, an output terminal, and a first switching element coupled between the input terminal and the output terminal. The first switching element includes a semiconductor multilayer structure formed on a substrate and made of a nitride semiconductor, a gate electrode formed on the semiconductor multilayer structure, a first and a second ohmic electrode, and a back electrode formed on a back surface of the substrate. A potential is supplied from the power supply connected to the input terminal to the back electrode so that a potential difference between the back surface and the second ohmic electrode is reduced. When the first switching element is in the on-state, a positive voltage bias is applied to the back electrode.
    • 功率转换器包括被配置为连接到电源,输出端子和耦合在输入端子和输出端子之间的第一开关元件的输入端子。 第一开关元件包括形成在衬底上并由氮化物半导体形成的半导体多层结构,形成在半导体多层结构上的栅电极,第一和第二欧姆电极以及形成在衬底的背面上的背电极 。 从连接到输入端子的电源向背面电极提供电位,使得背面与第二欧姆电极之间的电位差减小。 当第一开关元件处于导通状态时,正电压偏压被施加到背电极。
    • 9. 发明授权
    • Nitride semiconductor based bipolar transistor and the method of manufacture thereof
    • 氮化物半导体双极晶体管及其制造方法
    • US07728359B2
    • 2010-06-01
    • US11812591
    • 2007-06-20
    • Tatsuo MoritaTetsuzo Ueda
    • Tatsuo MoritaTetsuzo Ueda
    • H01L51/00
    • H01L29/2003H01L29/201H01L29/66318H01L29/7371
    • In a nitride semiconductor based bipolar transistor, a contact layer formed so as to contact an emitter layer is composed of n-type InAlGaN quaternary mixed crystals, the emitter layer and the contact layer are selectively removed so that the barrier height with the emitter formed thereon is small, and the ohmic electrode contact resistance can be lowered on the InAlGaN quaternary mixed crystals, for example, so that a WSi emitter electrode becomes an eave. A base electrode is formed by a self-aligned process using the emitter electrode as a mask. By such a configuration, the distance between the emitter and the edge of the base electrode is sufficiently shortened, and the base resistance can be lowered. As a result, a bipolar transistor having favorable high-frequency characteristics can be realized.
    • 在基于氮化物半导体的双极型晶体管中,形成为与发射极层接触的接触层由n型InAlGaN四元混晶构成,选择性地去除发射极层和接触层,使得其上形成有发射极的势垒高度 例如,在InAlGaN四元混晶中的欧姆电极接触电阻可以降低,使得WSi发射极成为檐。 通过使用发射电极作为掩模的自对准工艺形成基极。 通过这样的结构,能够充分地缩短发射极与基极的边缘之间的距离,能够降低基极电阻。 结果,可以实现具有良好的高频特性的双极晶体管。