Patent ID: 8778807
Filing Date: 2014-07-15
Classification: H01L

Abstract:
1. A method comprising: forming a first hard mask layer over a substrate; forming an adhesion layer over and adjoining the first hard mask layer; forming an oxide layer over and contacting the adhesion layer, the adhesion layer disposed between the first hard mask layer and the oxide layer, wherein the oxide layer has a lower atomic percentage of silicon than the adhesion layer; forming a second hard mask layer over the oxide layer; patterning the second hard mask layer to form a hard mask; forming a spacer layer on the hard mask, the spacer layer having a first portion and a second portion on opposite sidewalls of the hard mask; removing the hard mask from between the first portion and the second portion of the spacer layer; patterning the first hard mask layer using the first portion and the second portion of the spacer layer as masks; and etching the substrate using patterns formed from the hard mask and using the first hard mask layer as an etching mask.