Patent ID: 7534627
Filing Date: 2009-05-19
Classification: H01L

Abstract:
1. A method of controlling wafer critical dimension (CD) uniformity on a track lithography tool, the method comprising: obtaining a CD map for a wafer, the CD map comprising a plurality of CD data points correlated with a multi-zone heater geometry map, wherein the multi-zone heater comprises a plurality of heater zones; determining a CD value for a first heater zone of the plurality of heater zones based on one or more of the CD data points; computing a difference between the determined CD value for the first heater zone and a target CD value for the first heater zone; determining a temperature variation for the first heater zone based, in part, on the computed difference and a temperature sensitivity of a photoresist deposited on the wafer; modifying a temperature of the first heater zone based, in part, on the temperature variation.