Patent ID: 6987055

Claim:
A method for deposition of semiconductor material, comprising: providing a substrate, the substrate comprising a first material and a second material; exposing the first and second materials to at least one semiconductor material precursor under conditions in which growth of semiconductor material from the at least one precursor over the first and second materials comprises a lag phase period prior to a growth phase, and under which it takes longer for the growth phase to initiate on the second material than on the first material; the exposing being conducted for long enough for the growth phase to occur on the first material, but not for long enough for the growth phase to substantially occur on the second material; the exposing being conducted in a reaction chamber and comprising a pulse of the at least one precursor into the chamber followed by a purge to remove the at least one precursor substantially entirely from within the chamber; a sequence comprising two or more of the pulses being utilized to form a thickness of semiconductor material; and a different semiconductor precursor being flowed into the chamber during one of the two or more pulses relative to another of the two or more pulses.