Patent ID: 7838063

Claim:
A process for preparing an absorption layer of a solar cell composed of a 1B-3A-Se compound, comprising (a) preparing a mixture paste of Group 1B metal selenide particles and Group 3A metal selenide particles as reactants; (b) applying the paste to a base material; and (c) subjecting the resulting coating layer to rapid thermal processing, wherein the Group 1B metal selenide is a copper selenide (Cu—Se) prepared by adding a copper salt and selenious acid (H 2 SeO 3 ) to a solvent and heating the resulting mixture, and the Group 3A metal selenide is an indium selenide (In—Se) and/or gallium selenide (Ga—Se), wherein the indium selenide (In—Se) is prepared by adding an indium salt and selenious acid (H 2 SeO 3 ) to a solvent and heating the resulting mixture when the Group 3A metal selenide is indium selenide (In—Se).