Patent ID: 8906452
Filing Date: 2014-12-09
Classification: G03F

Abstract:
1. A method of coating a wafer with a film of photoresist having a uniform thickness profile across the wafer, the method comprising: depositing a photoresist solution on a top surface of a wafer, the photoresist solution including a photoresist and a solvent, the photoresist solution configured to provide a particular thickness of photoresist on the wafer upon evaporation of the solvent; and controlling the volatility of the photoresist solution to allow the solvent of the photoresist solution to evaporate at a specified rate concurrently with the photoresist of the photoresist solution forming a film having a uniform thickness profile at the particular thickness on the wafer; wherein depositing the photoresist solution on the top surface of the wafer includes: wherein removing the wafer from the spinning device when the photoresist solution reaches the edge of the wafer includes: