SOLAR CELL DEVICE AND METHOD FOR MANUFACTURING SAME

摘要

Disclosed is a solar cell device (1) wherein at least a part of a collector electrode (10) arranged on the back surface of a semiconductor substrate (2) contains a semiconductor element constituting the semiconductor substrate (2). The content of such a semiconductor element in the collector electrode (10) is greater in the side which is in contact with the semiconductor substrate (2) than in the outer side. Since the difference of thermal expansion coefficients at the interface between the semiconductor substrate (2) and the collector electrode (10) can be small in such a solar cell device (1), warping of the solar cell device (1) can be sufficiently reduced even when the semiconductor substrate (2) has a small thickness. Furthermore, since a BSF region (11) having a uniform and sufficient thickness can be formed in the back surface of the semiconductor substrate (2) while maintaining the conductivity of the collector electrode (10) within a good range, the solar cell device (1) can be excellent in characteristics such as conversion efficiency.