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    • 10. 发明申请
    • CMOS process with Si gates for nFETs and SiGe gates for pFETs
    • 用于nFET的Si栅极的CMOS工艺和用于pFET的SiGe栅极
    • US20070235759A1
    • 2007-10-11
    • US11401672
    • 2006-04-11
    • William HensonYaocheng LiuAlexander ReznicekKern RimDevendra Sadana
    • William HensonYaocheng LiuAlexander ReznicekKern RimDevendra Sadana
    • H01L31/00
    • H01L21/2807H01L21/823842
    • An integration scheme for providing Si gates for nFET devices and SiGe gates for pFET devices on the same semiconductor substrate is provided. The integration scheme includes first providing a material stack comprising, from bottom to top, a gate dielectric, a Si film, and a hard mask on a surface of a semiconductor substrate that includes at least one nFET device region and at least one pFET device region. Next, the hard mask is selectively removed from the material stack in the at least one pFET device region thereby exposing the Si film. The exposed Si film is then converted into a SiGe film and thereafter at least one nFET device is formed in the least one nFET device region and at least one pFET device is formed in the at least one pFET device region. In accordance with the present invention, the least one nFET device includes a Si gate and the at least one pFET includes a SiGe gate.
    • 提供了用于在同一半导体衬底上为pFET器件提供nFET器件的Si栅极和SiGe栅极的集成方案。 该集成方案包括首先提供材料堆叠,其从底部到顶部包括在半导体衬底的表面上的栅极电介质,Si膜和硬掩模,其包括至少一个nFET器件区域和至少一个pFET器件区域 。 接下来,将硬掩模从至少一个pFET器件区域中的材料堆叠中选择性地去除,从而暴露Si膜。 暴露的Si膜然后被转换成SiGe膜,此后在至少一个nFET器件区域中形成至少一个nFET器件,并且在至少一个pFET器件区域中形成至少一个pFET器件。 根据本发明,至少一个nFET器件包括Si栅极,并且至少一个pFET包括SiGe栅极。