Mitsubishi Electric Corporation

Aya Nishiyama

Hidetada Tokioka

Hiroyuki Fuchigami

To provide a solar cell that reduces occurrence of a defect and has high photoelectric conversion efficiency. The solar cell includes a silicon substrate such as an n-type single-crystal silicon substrate single crystal with pyramid-shaped irregularities P formed thereon, and an amorphous or microcrystal semiconductor layer formed on the single-crystal silicon substrate. A flat part F is formed in a valley portion of the pyramid-shaped irregularities P provided on a surface of the single-crystal silicon substrate. With this configuration, a steep angle of 70&#xb0; to 85&#xb0; of a concave portion formed by a substantially (111) surface can be widened to between 115&#xb0; and 135&#xb0;. Accordingly, a change of atomic step morphology attributable to a rounded shape can be eliminated, thereby enabling to reduce epitaxial growth and defects in the amorphous or microcrystal semiconductor layer.

Growing community of inventors

Tokyo, Japan

Aya Nishiyama