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    • 1. 发明授权
    • MOSFET having a low aspect ratio between the gate and the source/drain
    • MOSFET在栅极和源极/漏极之间具有低的纵横比
    • US06528855B2
    • 2003-03-04
    • US09911894
    • 2001-07-24
    • Qiuyi YeWilliam TontiYujun LiJack A. Mandelman
    • Qiuyi YeWilliam TontiYujun LiJack A. Mandelman
    • H01L29772
    • H01L29/0653H01L21/823814H01L21/823878H01L29/66621H01L29/66636H01L29/7834
    • A MOSFET having a new source/drain (S/D) structure is particularly adapted to smaller feature sizes of modern CMOS technology. The S/D conductors are located on the shallow trench isolation (STI) to achieve low junction leakage and low junction capacitance. The S/D junction depth is defined by an STI etch step (according to a first method of making the MOSFET) or a silicon etch step (according to a second method of making the MOSFET). By controlling the etch depth, a very shallow junction depth is achieved. There is a low variation of gate length, since the gate area is defined by etching crystal silicon, not by etching polycrystalline silicon. There is a low aspect ratio between the gate and the S/D, since the gate conductor and the source and drain conductors are aligned on same level. A suicide technique is applied to the source and drain for low parasitic resistance; however, this will not result in severe S/D junction leakage, since the source and drain conductors sit on the STI.
    • 具有新的源极/漏极(S / D)结构的MOSFET特别适用于现代CMOS技术的较小特征尺寸。 S / D导体位于浅沟槽隔离(STI)上,以实现低结漏电和低结电容。 通过STI蚀刻步骤(根据制造MOSFET的第一种方法)或硅蚀刻步骤(根据制造MOSFET的第二种方法)限定S / D结深度。 通过控制蚀刻深度,实现非常浅的结深度。 栅极长度的变化很小,因为栅极区域是通过蚀刻晶体硅来定义的,而不是蚀刻多晶硅。 由于栅极导体和源极和漏极导体在同一个电平上对齐,栅极和S / D之间的纵横比较低。 自杀技术应用于源极和漏极,用于低寄生电阻; 然而,这不会导致严重的S / D结泄漏,因为源极和漏极导体位于STI上。