Patent ID: 7776698
Filing Date: 2010-08-17
Classification: H01L

Abstract:
1. A method for epitaxially forming a silicon-carbon film on a monocrystalline surface on a substrate, comprising: placing the substrate including the monocrystalline surface and secondary surfaces into a process chamber; exposing the substrate to deposition gases comprising a silicon source, a carbon source and an n-type dopant at a deposition temperature of less than about 600° C. and at a deposition pressure; and exposing the substrate to an etching gas comprising hydrogen chloride at an etching temperature exceeding about 600° C. and below about 650° C. and at an etching pressure at least about 10 times the deposition pressure and exceeding about 100 Torr, the method resulting in selective deposition of the silicon-carbon film in the form of heavily doped n-type epitaxy on the monocrystalline surface.