Patent ID: 7902454

Claim:
A solar cell, comprising: a semiconductor substrate including a light-receiving surface, a back surface provided on an opposite side of the light-receiving surface, and a through hole penetrating the semiconductor substrate from the light-receiving surface to the back surface; a first light-receiving-surface-side amorphous semiconductor layer formed on the light-receiving surface of the semiconductor substrate and on a part of an inner wall of the through hole; a second light-receiving-surface-side amorphous semiconductor layer formed on the first light-receiving-surface-side amorphous semiconductor layer; a first back-surface-side amorphous semiconductor layer formed on the back surface of the semiconductor substrate and on a part of the inner wall of the through hole; a second back-surface-side amorphous semiconductor layer formed on the first back-surface-side amorphous semiconductor layer; and a conductor provided inside the through hole and insulated from the first back-surface-side amorphous semiconductor layer and the second back-surface-side amorphous semiconductor layer by use of an insulating layer, wherein the first light-receiving-surface-side amorphous semiconductor layer and the first back-surface-side amorphous semiconductor layer have an i-type conductivity, and the inner wall surface of the through hole is covered with the first light-receiving-surface-side amorphous semiconductor layer and the first back-surface-side amorphous semiconductor layer.