Patent ID: 7147977
Filing Date: 2006-12-12
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device comprising the steps of: (a) mounting a semiconductor wafer on a wafer chuck and holding the semiconductor wafer by letting an underlying surface of the semiconductor wafer, the underlying surface being opposite to a principal surface of the semiconductor wafer, absorb on the wafer chuck by vacuum absorption; and (b) transferring a design pattern onto the principal surface of the semiconductor wafer by exposing an exposure light, which passes through a mask having the design pattern, onto the principal surface of the semiconductor wafer held on the wafer chuck, wherein the underlying surface, has irregularities with cross-sectional cycle lengths of 300 μm or more and depressions with opening diameters of 100 μm or less, and is formed such that an arithmetic mean of depths of the irregularities and depths of the depressions is 200 nm or less, and in the step (b), differences in distance between a focal position of the exposure light and the principal surface of the semiconductor wafer held on the wafer chuck are set at 50% or less of a design rule.