Patent ID: 6377334
Filing Date: 2002-04-23
Classification: G03F

Abstract:
A system for controlling the image size of integrated circuits on a semiconductor wafer supported on a temperature-controllable hot plate; said system comprising:(a) means for positioning said wafer on a surface of said hot plate; (b) means for developing a predetermined temperature pattern across said wafer responsive to controlling the temperature across a plurality of zones extending over the surface of said hot plate; said zones being individually temperature-controllable for controlling the temperature ranging across the surface of said hot plate; (c) means for measuring the image linewidth of said integrated circuits at a plurality of locations across the surface of said wafer; (d) means for plotting and correlating the image line measurements with previously plotted image linewidth measurement data relative to past exposure bake temperatures to provide a standard; and (e) means for maximizing image linewidth uniformity by adjusting the temperature across the hot plate surface.