Planarization apparatus, planarization process, and method of manufacturing an article
Abstract:
A method of real time leveling control between a superstrate and a substrate is provided. A contact force model indicating a relationship between a total contact force for planarization of a formable material between the superstrate and the substrate and a force component of the total contact force along each of a plurality peripheral axes is identified. A set point force required for performing the planarization is determined. Each force component is calculated based on the contact force model. The planarization is performed by applying each force component along a corresponding axis of the plurality of axes. The contact force model is identified based on a parallel condition between two contacting surfaces of a superstrate chuck for retaining the superstrate and a stack of the superstrate, the substrate, and formable material between the superstrate and the substrate.
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