Patent ID: 7354848
Filing Date: 2008-04-08
Classification: H01L

Abstract:
1. A method of depositing an α-Si layer on a substrate, comprising: placing the substrate in a chamber; depositing an α-Si nucleation layer on said substrate using a first Si-containing source gas provided into the chamber; stopping flow of the first Si-containing source after the α-Si nucleation layer has been formed; depositing α-Si on the α-Si nucleation layer using a second Si-containing source gas to form an α-Si layer of less than about 50 Å thickness; depositing a poly-SiGe layer on the α-Si layer; and thermally annealing the α-Si nucleation layer, the α-Si nucleation layer and the α-Si layer to convert the α-Si nucleation layer and the α-Si layer into poly-SiGe layers.