Extreme ultraviolet lithography mask blank and manufacturing method therefor

Patent Information
Patent
Extreme ultraviolet lithography mask blank and manufacturing method therefor
Abstract
A reflective element for extreme ultraviolet semiconductor lithography systems substantially minimizes the phase transitions of reflected extreme ultraviolet light by a reflective multilayer coating on an extremely planar surface which is parallel to a family of (111) crystallographic planes of a single crystal silicon wafer. The extremely planar surface is made by using three of the families of (111) crystallographic planes of the single crystal silicon as etch barriers for anisotropic etchants.
Patent Family
25527656
Authority
US
Year Applied
1997
Year Granted
1999
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NameSectorAbstractYear AppliedYear GrantedAuthority
EXTREME ULTRAVIOLET LITHOGRAPHY MASK BLANK AND MANUFACTURING METHOD THEREFOR

Manufacturing

A reflective element for extreme ultraviolet semiconductor lithography systems substantially minimizes the phase transitions of reflected extreme ultraviolet light by a reflective multilayer coating on an extremely planar surface which...
A reflective element for extreme ultraviolet semiconductor lithography systems substantially minimizes the phase transitions of reflected extreme ultraviolet light by a reflective multilayer coating on an extremely planar surface which is parallel to a family of (111) crystallographic planes of a single crystal silicon wafer. The extremely planar surface is made by using three of the families of (111) crystallographic planes of the single crystal silicon as etch barriers for anisotropic etchants.
1998_____WO
Extreme ultraviolet lithography mask blank and manufacturing method therefor

Manufacturing

A reflective element for extreme ultraviolet semiconductor lithography systems substantially minimizes the phase transitions of reflected extreme ultraviolet light by a reflective multilayer coating on an extremely planar surface which...
A reflective element for extreme ultraviolet semiconductor lithography systems substantially minimizes the phase transitions of reflected extreme ultraviolet light by a reflective multilayer coating on an extremely planar surface which is parallel to a family of (111) crystallographic planes of a single crystal silicon wafer. The extremely planar surface is made by using three of the families of (111) crystallographic planes of the single crystal silicon as etch barriers for anisotropic etchants.
19992000US
Extreme ultraviolet lithography mask blank and manufacturing method therefor

Manufacturing

A reflective element for extreme ultraviolet semiconductor lithography systems substantially minimizes the phase transitions of reflected extreme ultraviolet light by a reflective multilayer coating on an extremely planar surface which...
A reflective element for extreme ultraviolet semiconductor lithography systems substantially minimizes the phase transitions of reflected extreme ultraviolet light by a reflective multilayer coating on an extremely planar surface which is parallel to a family of (111) crystallographic planes of a single crystal silicon wafer. The extremely planar surface is made by using three of the families of (111) crystallographic planes of the single crystal silicon as etch barriers for anisotropic etchants.
19971999US
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