Patent ID: 8415088
Filing Date: 2013-04-09
Classification: G03F

Abstract:
1. A method for patterning a material layer over a substrate, comprising: performing a pre-treatment process to convert a portion of the material layer near a top surface of the material layer into an anti-reflective layer, wherein the pre-treatment process is accomplished by implanting ions, the anti-reflective layer is formed as a multi-layered structure with changing the dosage, the implanting energy and the types of the implanted ions, and each value of a refractive index and a absorption coefficient of the anti-reflective layer varies from a top surface of the anti-reflective layer to a bottom surface of the anti-reflective layer; forming a patterned photoresist layer on the anti-reflective layer; and patterning the material layer by using the patterned photoresist layer as a mask.