Patent ID: 9086631
Filing Date: 2015-07-21
Classification: G03F

Abstract:
1. A method for patterning a substrate, comprising: providing a substrate having a layer of extreme ultra violet (EUV) resist characterized by a target critical dimension (CD); selecting a target CD for a pattern to be formed in said layer of EUV resist; selecting a target exposure dose for exposing said layer of EUV resist to EUV radiation to achieve said target CD in said layer of EUV resist; exposing said layer of EUV resist to said EUV radiation at a first exposure dose less than said target exposure dose and developing said layer of EUV resist to achieve said pattern with a first CD larger than said target CD, said pattern having a first roughness; performing a CD slimming process to reduce said first CD to a second CD, said second CD being substantially equivalent to said target CD; and performing, optionally, a smoothing process to reduce said first roughness to a second roughness.