Patent ID: 11862457
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 9:
10. A method of fabricating a semiconductor device, the method comprising:
disposing a wafer on a chuck;
irradiating a lower surface of the wafer with a laser to heat the wafer; and
supplying a chemical to an upper surface of the wafer to clean the wafer,
wherein the laser penetrates an optical system including a lens array,
wherein the laser penetrates a calibration window, which includes a first window structure including a first light projection window including first and second regions different from each other, a first coating layer covering the first region of the first light projection window, and a second coating layer covering the second region of the first light projection window,
wherein the first coating layer and the second coating layer have different light transmissivities from each other, and
wherein the laser is transmitted through the first coating layer to have a lower intensity at the chuck as compared to an intensity of the laser at the chuck that is transmitted through the second coating layer.