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

Claim 12:
13. A photolithography method, comprising:
determining a first distance between a dispensing nozzle and a target layer over a first wafer, the first distance suitable for spin-on coating a first layer on the target layer through the dispensing nozzle;
vertically moving the dispensing nozzle such that the dispensing nozzle is at the first distance from the target layer;
coating the target layer with the first layer using the dispensing nozzle disposed at the first distance from the target layer;
determining a second distance between the dispensing nozzle and the target layer, the second distance suitable for spin-on coating a second layer over the target layer through the dispensing nozzle;
vertically moving the dispensing nozzle such that the dispensing nozzle is at the second distance from the target layer;
coating the first layer with the second layer using the dispensing nozzle disposed at the second distance from the target layer;
baking the first and second layers; and
patterning the target layer,
wherein the first distance and the second distance are sensed by a distance sensor,
wherein the second distance is different from the first distance.