Patent ID: 11876142
Assignee: SUNFLARE CO
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 2:
3. A process for preparing the PN junction according to claim 1, comprising following steps:
(a) stepwise sputter-coating a p-type CIGS semiconductor thin film layer and an n-type CIGS semiconductor thin film layer by using a target material containing elements selected from Cu, In, Ga and Se in a system of multiple continuous vacuum magnetron sputter coating chambers; and
(b) annealing the p-type and n-type CIGS semiconductor thin film layers under inert atmosphere within a temperature range of 350° C. to 450° C.,
wherein said annealing uses a green light laser or an electric heater as a heating source, and wherein said process is a dry process and requires no selenization treatment.