Patent ID: 9312131
Filing Date: 2016-04-12
CPC Classification: H01L

Claim Text:
1. A method of selectively forming epitaxial semiconductor material, comprising: providing a substrate with insulating regions and semiconductor windows formed therein; blanket depositing non-epitaxial silicon-containing semiconductor material over the insulating regions and epitaxial silicon-containing semiconductor material over the semiconductor windows by flowing a carbon source vapor with trisilane over the substrate wherein the silicon-containing semiconductor material comprises carbon-doped silicon, and wherein the silicon-containing semiconductor material over the semiconductor windows comprises at least about 1.0% substitutional carbon as-deposited; selectively etching the non-epitaxial, non-single-crystal, silicon-containing semiconductor material from over the insulating regions while leaving at least some epitaxial silicon-containing semiconductor material in the semiconductor windows by exposing the substrate to a halide gas source and a germanium source, wherein the germanium source comprises a germanium etch catalyst; repeating blanket depositing and selectively removing in a plurality of cycles; and wherein blanket depositing and selectively removing produces a net growth rate of the silicon-containing material of between about 4 nm/min and 11 nm/min, wherein in each depositing step, a thickness ratio of non-epitaxial semiconductor material over the insulating regions to the epitaxial silicon-containing semiconductor material over the semiconductor windows is less than about 1.6:1.