Gibb & Riley, LLC
Fin-type field effect transistors with single-diffusion breaks and method
Disclosed is a semiconductor structure, including at least one fin-type field effect transistor and at least one single-diffusion break (SDB) type isolation region, and a method of forming the semiconductor structure. In the method, an isolation bump is formed above an isolation region within a semiconductor fin and sidewall spacers are formed on the bump. During an etch process to reduce the height of the bump and to remove isolation material from the sidewalls of the fin, the sidewall spacers prevent lateral etching of the bump. During an etch process to form source/drain recesses in the fin, the sidewalls spacers protect the semiconductor material adjacent to the isolation region. Consequently, the sides and bottom of each recess include semiconductor surfaces and the angle of the top surfaces of the epitaxial source/drain regions formed therein is minimized, thereby minimizing the risk of unlanded source/drain contacts.
GLOBALFOUNDRIES INC.
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Haiting Hui Wei Zhenyu Hong Xusheng
Wang Zang Zhao Hu Yu Wu