An apparatus for holding a wafer and a method for immersion lithography.
The apparatus, including a wafer chuck having a central circular vacuum
platen, an outer region, and a circular groove centered on the vacuum
platen, a top surface of the vacuum platen recessed below a top surface
of the outer region and a bottom surface of the groove recessed below the
top surface of the vacuum platen; one or more suction ports in the bottom
surface of the groove; and a hollow toroidal inflatable and deflatable
bladder positioned within the groove.