发明申请
US20090184341A1 Elimination of STI recess and facet growth in embedded silicon-germanium (eSiGe) module 审中-公开
消除嵌入式硅 - 锗(eSiGe)模块中STI凹陷和增长

Elimination of STI recess and facet growth in embedded silicon-germanium (eSiGe) module
摘要:
A method (and semiconductor device) of fabricating a semiconductor device eliminates shallow trench isolation (STI) recess in embedded SiGe p-type field effect transistor (pFET) structures. This increases device performance by improving isolation and decreasing leakage current caused by SiGe facet growth and silicide encroachment at the STI. A mask is selectively formed over the STI and adjacent nFET regions to protect them during formation (e.g., reactive ion etching (RIE)) of the embedded source/drain (S/D) regions of the pFET. The mask also extends over the STI edge by a predetermined distance to cover a portion of the embedded S/D region disposed between the STI and gate structure. This helps protect or isolate the STI region during SiGe layer formation in the defined embedded S/D regions.
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