Patent ID: 6355105
Filing Date: 2002-03-12
Classification: G03F,H01L

Abstract:
A photoresist coating system for coating a liquid photoresist layer on a wafer, said photoresist coating system comprising:a pump for pumping said photoresist from a reservior; a tank, wherein said tank maintains a flowing rate of said photoresist in an approximately fixed value before said photoresist is pumped into said pump; a first pipeline for conveying said photoresist from said reservior to said tank; a second pipeline for conveying said photoresist from said tank to said pump; a reactor, wherein said photoresist is dispensed and coated on said wafer to form a photoresist layer; a third pipeline for conveying said photoresist from said pump to said reactor; a capacitor sensor, wherein said capacitor sensor is coupled to said first pipeline and is used to detect existence of bubble in said photoresist; a photochopper sensor, wherein said photochopper sensor is coupled to said second pipeline and is used to detect existence of bubbles, said photochopper sensor being adjacent to said pump; and a controller, wherein said controller is coupled to both said capacitor sensor and said photochopper sensor, and wherein said controller alarms and terminates an operation of said photoresist coating system when a warning message from said sensors is received by said controller.