Patent ID: 8673725
Filing Date: 2014-03-18
Classification: H01L

Abstract:
1. A method for forming a multilayer sidewall spacer over a patterned structure, comprising: providing a substrate containing the patterned structure on a surface of the substrate, wherein the patterned structure contains an undercut near the interface region with the surface of the substrate, and wherein the surface of the substrate and the undercut in the patterned structure form an angle of less than 90 degrees; depositing a first spacer layer over the patterned structure at a first substrate temperature; depositing a second spacer layer over the patterned substrate at a second substrate temperature that is different from the first substrate temperature, wherein the first and second spacer layers contain the same chemical elements; and etching the first and second spacer layers to form the multilayer sidewall spacer on the patterned structure.