Patent ID: 7633601

Claim:
A method for controlling immersion lithography process of wafers, the immersion lithography process sequentially comprising an immersion lithography exposure step and a baking step, the method for avoiding defects of exposed wafers after finishing the immersion lithography exposure step and before undergoing the baking step comprising: adjusting a speed of wafers beginning to undergo the immersion lithography exposure step according to a number of wafers finishing the baking step; adjusting the speed of wafers beginning to undergo the immersion lithography exposure step by comparing a first time interval between the exposure step of a plurality of wafers and a second time interval between the baking step of a plurality of wafers; adjusting the speed of wafers beginning to undergo the immersion lithography exposure step according to a length of duration of the exposed wafers waiting to undergo the baking step; and adjusting the speed of wafers beginning to undergo the immersion lithography exposure step according to a number of exposed wafers waiting to undergo the baking step.