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    • 81. 发明申请
    • Substrate backgate for trigate FET
    • 基板背板用于触发FET
    • US20080185649A1
    • 2008-08-07
    • US12099211
    • 2008-04-08
    • Brent A. AndersonMatthew J. BreitwischEdward J. Nowak
    • Brent A. AndersonMatthew J. BreitwischEdward J. Nowak
    • H01L29/786H01L21/336
    • H01L29/785H01L21/845H01L27/1211H01L29/66795
    • Disclosed is a tri-gate field effect transistor with a back gate and the associated methods of forming the transistor. Specifically, a back gate is incorporated into a lower portion of a fin. A tri-gate structure is formed on the fin and is electrically isolated from the back gate. The back gate can be used to control the threshold voltage of the FET. In one embodiment the back gate extends to an n-well in a p-type silicon substrate. A contact to the n-well allows electrical voltage to be applied to the back gate. A diode created between the n-well and p-substrate isolates the current flowing through the n-well from other devices on the substrate so that the back gate can be independently biased. In another embodiment the back gate extends to n-type polysilicon layer on an insulator layer on a p-type silicon substrate. A contact to the n-type polysilicon layer allows electrical voltage to be applied to the back gate. A trench isolation structure extending through the polysilicon layer to the insulator layer isolates current flowing through the polysilicon layer from other devices on the silicon substrate.
    • 公开了具有背栅的三栅场效应晶体管和形成晶体管的相关方法。 具体地说,后门结合在翅片的下部。 三栅结构形成在翅片上并与后门电隔离。 背栅可用于控制FET的阈值电压。 在一个实施例中,背栅极延伸到p型硅衬底中的n阱。 与n阱的接触允许将电压施加到后门。 在n阱和p衬底之间产生的二极管将流过n阱的电流与衬底上的其他器件隔离,使得后栅极可以被独立地偏置。 在另一个实施例中,背栅极延伸到p型硅衬底上的绝缘体层上的n型多晶硅层。 与n型多晶硅层的接触允许电压施加到后门。 通过多晶硅层延伸到绝缘体层的沟槽隔离结构将流过多晶硅层的电流与硅衬底上的其它器件隔离。