Patent ID: 6391800
Filing Date: 2002-05-21
Classification: G03F,H01L

Abstract:
A method for patterning a wafer substrate having a surface with high aspect ratio topography with a coating solution, comprising the steps of:pre-wetting a surface of a wafer substrate having high aspect ratio topography with a solvent solution to form a liquid solvent film; applying an additional amount of the solvent solution to form a solvent puddle on the liquid solvent film; dispensing photoresist onto the solvent puddle for a sufficient time and in a sufficient amount to allow diffusion of the photoresist and the solvent puddle into the topography of the surface of the substrate; replacing the solvent solution in the topography from the pre-wetting step with the photoresist by facilitating diffusion of the photoresist into the topography; and spreading the photoresist to cast a predetermined thickness of the photoresist on the surface of the substrate.