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    • 35. 发明授权
    • Method of forming a novel gate electrode structure comprised of a silicon-germanium layer located between random grained polysilicon layers
    • 形成由位于无规晶粒多晶硅层之间的硅 - 锗层构成的新型栅电极结构的方法
    • US06780741B2
    • 2004-08-24
    • US10338155
    • 2003-01-08
    • Chia-Lin ChenLiang-Gi YaoShih-Chang Chen
    • Chia-Lin ChenLiang-Gi YaoShih-Chang Chen
    • H01L213205
    • H01L21/28044H01L29/4925
    • A method of fabricating a gate structure for a MOSFET device, allowing a reduced polysilicon depletion effect as well as increased carrier mobility to be realized, has been developed. The method features a polysilicon-germanium component of the gate structure, sandwiched between an underlying polysilicon seed layer and an overlying polysilicon cap layer. The inclusion of germanium in the deposited polysilicon-germanium component results in enhanced dopant activation and thus a reduced polysilicon depletion effect. The polysilicon seed and cap layers are subjected to low temperature, anneal procedures, performed in situ in a hydrogen ambient, after deposition of the polysilicon layers. The in situ anneal procedures alters the columnar grains of the polysilicon layers to small, random grains resulting in smooth polysilicon surfaces, with the smooth surface of the polysilicon seed layer interfacing the underlying gate insulator layer resulting in enhanced carrier mobility when compared to counterpart polysilicon seed layer comprised with rough surfaces.
    • 已经开发了制造用于MOSFET器件的栅极结构的方法,其允许减少的多晶硅耗尽效应以及增加的载流子迁移率被实现。 该方法具有栅极结构的多晶硅 - 锗组分,夹在下面的多晶硅种子层和上覆多晶硅覆盖层之间。 在沉积的多晶硅 - 锗组分中包含锗导致增强的掺杂剂活化,从而减少了多晶硅的耗尽效应。 多晶硅种子和盖层经过低温退火处理,在沉积多晶硅层之后在氢环境中原位进行。 原位退火程序将多晶硅层的柱状晶体改变成小的随机晶粒,产生平滑的多晶硅表面,与对应的多晶硅晶粒相比,多晶硅籽晶层的平滑表面与下面的栅极绝缘体层相接触,导致增强的载流子迁移率 层包含粗糙表面。