Patent ID: 8642376

Claim:
A method of depositing a material atop a substrate, comprising: exposing a substrate to a silicon containing gas and a reducing gas; increasing a flow rate of the silicon containing gas while decreasing a flow rate of the reducing gas to form a first layer; and depositing a second layer atop the first layer, wherein depositing the second layer atop the first layer comprises: (a) flowing a silicon containing qas into a hot wire chemical vapor deposition (HWCVD) chamber at a first flow rate for a first period of time to form a first species that reacts with the substrate, wherein the substrate is disposed in the HWCVD chamber; (b) subsequently flowing a reducing qas alone or in combination with an inert carrier gas into the HWCVD chamber at a second flow rate for a second period of time to form a second species that reacts with the substrate disposed in the HWCVD chamber; and (c) repeating (a)-(b) until the layer has a desired thickness.