Patent ID: 7029801
Filing Date: 2006-04-18
Classification: G03F,Y10S

Abstract:
1. A method for manufacturing a mask for electron beam lithography, comprising: providing an SOI substrate having a silicon base layer, an insulating layer arranged on the silicon base layer, and an SOI layer arranged on the insulating layer; forming a protective layer on a front side of the SOI layer simultaneously with forming a hard mask layer on a back side of the silicon base layer; forming a resist film on the hard mask layer; patterning the resist film to form a mask for etching the hard mask layer; etching the hard mask layer using the patterned resist film as a mask to form a hard mask; etching the silicon base layer using the etched hard mask as a mask; etching the insulating layer; removing the protective layer formed on the front side of the SOI layer; and etching the SOI layer after the protective layer is removed from the front side of the SOI layer.