Patent ID: 11929446
Assignee: CHANGCHUN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Field: Semiconductors (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 8:
9. The preparation method according to claim 8, wherein in step (3), the photolithography is as follows: spinning a layer of positive photoresist with a thickness of 580-620 nm on the silicon dioxide film at 3,800-4,200 rpm/s to obtain a photoresist-containing product;
heating the photoresist-containing product at 85-95° C. for 50-70 s;
conducting exposure using a UV lithography machine to obtain an exposed product;
heating and hard baking the exposed product at 100-110° C. for 100-140 s to obtain an intermediate product; and
placing the intermediate product in a developing solution for development for 15-20 s.