CHALCOPYRITE SOLAR CELL AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To dope a depletion layer, formed near the interface of a light absorption layer and a buffer layer, at a sufficient concentration in a chalcopyrite solar cell.SOLUTION: A buffer layer 18 containing a substance becoming a source of dopant is deposited on a light absorbing layer 16. Before or after forming a transparent electrode 20 on the buffer layer 18, and after obtaining a chalcopyrite solar cell, annealing is performed. During this process, dopant is generated in the buffer layer 18, and diffused into the light absorbing layer 16. In other words, the light absorbing layer 16 is brought into a state added with the dopant. As a result, such a concentration gradient that the dopant concentration increases from the back electrode 14 side toward the buffer layer 18 side occurs in the light absorbing layer 16.