Patent ID: 11955335
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 7:
8. A photo resist coating apparatus, comprising:
a wafer holder configured to support a wafer and to rotate the wafer;
a nozzle configured to dispense a photo resist;
another nozzle configured to dispense a solvent;
an arm coupled to the nozzle and configured to move the nozzle horizontally and vertically; and
a control system including a processor and a memory storing a program and a coating recipe and configured to control the wafer holder, the nozzle, the another nozzle and the arm according to the coating recipe, wherein: the program, when executed by the processor, causes the control system to perform:
starting dispensing the photo resist from the nozzle while rotating the wafer at a first speed while the nozzle is at a center of the wafer;
continuing dispensing the photo resist while rotating the wafer at a second speed different from the first speed while the nozzle is at a center of the wafer;
continuing dispensing the photo resist while rotating the wafer at a third speed different from the second speed while the nozzle is at a center of the wafer;
continuing dispensing the photo resist while rotating the wafer at a fourth speed different from the third speed while the nozzle is at a center of the wafer;
continuing dispensing the photo resist while rotating the wafer at a fifth speed and moving the nozzle horizontally from the center toward an edge of the wafer;
continuing dispensing the photo resist while rotating the wafer at a sixth speed different from the fifth speed while the nozzle is at the edge of the wafer; and
after stopping the movement of the nozzle, stopping dispensing the photo resist while rotating the wafer at a seventh speed different from the sixth speed.