Notched-base spacer profile for non-planar transistors

Semiconductor device manufacturing: process – Introduction of conductivity modifying dopant into... – Plasma

Reexamination Certificate

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C438S311000, C438S680000, C438S733000, C438S009000, C257SE21170, C257SE21400, C257SE21320, C257SE21051, C257SE21411, C257SE21182, C257SE21218, C257SE21229, C257SE21227

Reexamination Certificate

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07833887

ABSTRACT:
A method of forming a notched-base spacer profile for non-planar transistors includes providing a semiconductor fin having a channel region on a substrate and forming a gate electrode adjacent to sidewalls of the channel region and on a top surface of the channel region, the gate electrode having on a top surface a hard mask. a spacer layer is deposited over the gate and the fin using a enhanced chemical vapor deposition (PE-CVD) process. A multi-etch process is applied to the spacer layer to form a pair of notches on laterally opposite sides of the gate electrode, wherein each notch is located adjacent to sidewalls of the fin and on the top surface of the fin.

REFERENCES:
patent: 6413802 (2002-07-01), Hu et al.
patent: 6657252 (2003-12-01), Fried et al.
patent: 6768158 (2004-07-01), Lee et al.
patent: 7491630 (2009-02-01), Shroff et al.
patent: 7601592 (2009-10-01), Oh et al.
patent: 2008/0073723 (2008-03-01), Rachmady et al.

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