Patent ID: 11959864
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 16:
17. The photolithography method of claim 13, further comprising:
determining a third distance between the dispensing nozzle and the target layer, the third distance suitable for spin-on coating a third layer over the target layer through the dispensing nozzle, wherein the third distance is different from the first distance and the second distance;
after the coating of the first layer with the second layer, vertically moving the dispensing nozzle such that the dispensing nozzle is at the third distance from the target layer, wherein the third distance is sensed by the distance sensor;
coating the second layer with the third layer using the dispensing nozzle at the third distance from the target layer;
curing the first layer, the second layer, and the third layer to form a tri-layer photoresist;
patterning the tri-layer photoresist; and
etching the target layer using the patterned tri-layer photoresist as an etch mask.