Iy. Kim et al., BLURRING EFFECT ANALYSIS OF AN X-RAY MASK FOR SYNCHROTRON-RADIATION LITHOGRAPHY, Journal of vacuum science & technology. B, Microelectronics and nanometer structures processing, measurement and phenomena, 16(4), 1998, pp. 1992-1997
During the process of synchrotron radiation lithography, blurring occu
rs largely because the mask and patterns are distorted under transient
thermal loads. An analysis model of blurring has been proposed in thi
s article. Irradiated energy is calculated by summing the moving x-ray
power incident to a wafer. The blur is caused mainly by two sources:
displacement of the pattern and pattern width change. A transient anal
ysis has been made. In a sample calculation, the distortion of a print
ed pattern after the process was 1.2 nm while the maximum in-plane dis
tortion during the process was 3.5 nm and width change -3.5 nm for a 1
Hz scanning frequency. Comparison between distortions without conside
ring blurring effect and distortions considering blurring effect was o
ffered. The effect of scanning frequency on printed pattern distortion
and width change was also presented. (C) 1998 American Vacuum Society
.