Joy Y. Cheng, Daniel P. Sanders, et al.
SPIE Advanced Lithography 2008
Paper
Determination of Helium presence in the mask/wafer gap of X-ray lithography steppers
Abstract
This paper describes a technique to determine the presence and uniformity of Helium in the mask/wafer gap of x-ray lithography steppers by utilizing the oxygen sensitive resist polychlorostyrene (PSC). Results obtained at the IBM Advanced Lithography Facility using a SUSS stepper and the HELIOS superconducting synchrotron storage ring are presented. © 1995 Elsevier Science B.V. All rights reserved.
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