Patent ID: 8426265
Filing Date: 2013-04-23
Classification: H01L

Abstract:
1. A method of manufacturing complementary transistor devices, said method comprising: patterning first gate stacks on a first region of a substrate and second gate stacks on a second region of said substrate, said first gate stacks and said second gate stacks each comprising a gate insulator on said substrate, a gate conductor on said gate insulator, and a first conformal insulator layer covering said gate insulator and said gate conductor; etching said substrate simultaneously in regions between said first gate stacks and said second gate stacks to form recesses in said substrate and to reduce a thickness of said first conformal insulator; growing first doped silicon in said recesses; depositing a second conformal insulator layer, different than said first conformal insulator layer, over said first doped silicon and over said first conformal insulator layer; patterning a protective material to mask a first portion of said second conformal insulator layer covering said first gate stacks and said first doped silicon adjacent to said first gate stacks; removing a second portion of said second conformal insulator layer from unmasked regions not protected by said protective material to fully expose top surfaces of said first doped silicon adjacent to said second gate stacks, said removing of said second portion being performed so as to leave intact said first conformal insulator over all said first gate stacks and said second gate stacks; removing, from said recesses adjacent to said second gate stacks, said first doped silicon that has said top surfaces fully exposed using a hydrogen chloride (HCL) etch process that is highly selective to said first doped silicon over said substrate and said first conformal insulator layer; and after said removing of said first doped silicon, growing second doped silicon-in said recesses adjacent to said second gate stacks, said second doped silicon producing a second strain characteristic within said substrate that is different than a first strain characteristic produced by said first doped silicon.