Gibb I.P. Law Firm, LLC
Pre-silicide spacer removal
A method forms a gate conductor over a substrate, and simultaneously forms spacers on sides of the gate conductor and a gate cap on the top of the gate conductor. Isolation regions are formed in the substrate and the method implants an impurity into exposed regions of the substrate not protected by the gate conductor and the spacers to form source and drain regions. The method deposits a mask over the gate conductor, the spacers, and the source and drain regions. The mask is recessed to a level below a top of the gate conductor but above the source and drain regions, such that the spacers are exposed and the source and drain regions are protected by the mask. With the mask in place, the method then safely removes the spacers and the gate cap, without damaging the source/drain regions or the isolation regions (which are protected by the mask). Next, the method removes the mask and then forms silicide regions on the gate conductor and the source and drain regions.
International Business Machines Corporation
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Huilong Sunfei Yaocheng Jiang Thomas W. Jun Jung
Zhu Fang Liu Yan Dyer Kim