Semiconductor device manufacturing: process – Formation of semiconductive active region on any substrate – Polycrystalline semiconductor
Reexamination Certificate
2006-08-29
2008-08-19
Dang, Trung (Department: 2892)
Semiconductor device manufacturing: process
Formation of semiconductive active region on any substrate
Polycrystalline semiconductor
C438S489000, C438S507000
Reexamination Certificate
active
07413967
ABSTRACT:
A method for determining a SiGe deposition condition so as to improve yield of a semiconductor structure. Fabrication of the semiconductor structure starts with a single-crystal silicon (Si) layer. Then, first and second shallow trench isolation (STI) regions are formed in the single-crystal Si layer. The STI regions sandwich and define a first single-crystal Si region. Next, silicon-germanium (SiGe) mixture is deposited on top of the structure in a SiGe deposition condition so as to grow (i) a second single-crystal silicon region grows up from the top surface of the first single-crystal silicon region and (ii) first and second polysilicon regions from the top surfaces of the first and second STI regions, respectively. By increasing SiGe deposition temperature and/or lowering precursor flow rate until the resulting yield is within a pre-specified range, a satisfactory SiGe deposition condition can be determined for mass production of the structure.
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Dupuis Mark D.
Hodge Wade J.
Kelly Daniel T.
Wuthrich Ryan W.
Dang Trung
International Business Machines - Corporation
Sabo William D.
Schmeiser Olsen & Watts
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