Dual channel material for finFET for high performance CMOS
Abstract:
Silicon fins are formed in a bulk silicon substrate and thereafter trench isolation regions are formed between each silicon fin. The silicon fins in nFET and pFET device regions are then recessed. A relaxed silicon germanium alloy fin portion is formed on a topmost surface of each recessed silicon fin portion or on exposed surface of the substrate. A compressively strained silicon germanium alloy fin portion is formed on each relaxed silicon germanium alloy fin portion within the pFET device region, and a strained silicon-containing fin portion is formed on each relaxed silicon germanium alloy fin portion within the nFET device region. Sidewall surfaces of each compressively strained silicon-containing germanium alloy fin portion and each tensile strained silicon-containing fin portion are then exposed. A functional gate structure is provided on the exposed sidewall surfaces of each compressively strained silicon-containing germanium alloy fin portion and each tensile strained silicon-containing fin portion.
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