Patent ID: 7977220

Claim:
A method for depositing silicon (Si) on a surface of a substrate, comprising: providing a substrate wherein the substrate comprises a metallurgical grade silicon on which silicon (Si) is to be deposited; purifying a surface of the substrate; producing a diffusion barrier on the surface of the substrate that is purified; opening vias in the diffusion barrier on the surface of the substrate prior to depositing silicon thereon; providing one or more sources of gas, wherein at least one source of gas comprises a halide-containing gas; providing a reaction vessel comprising a silicon containing reaction bed, wherein said silicon containing reaction bed is between the substrate and the one or more sources of gas; and directing a gas from the one or more sources of gas into the silicon containing reaction bed at a temperature effective to release silicon in a form of a halogenated silane from the silicon containing reaction bed toward the substrate for deposition thereon.