[15a-A24-1~10] 16.3 Bulk, thin-film and other silicon-based solar cells

[15a-A24-6] Effect of Carbon and Oxygen Precipitation on the Quality of the Single Crystal Silicon

〇Isao Msada¹, Shoji Tachibana¹, Nobuhito Iida¹, Eiichi Nishijima¹, Takuto Kojima², Kyotaro Nakamura², Atsushi Ogura², Yoshio Ohshita³ (1.Tokuyama Corporation, 2.Meiji Univ., 3.Toyota Tech. Inst.)

Keywords:silicon, solar cell, oxygen precipitation

Oxygen precipitation in the heating process of the solar cell production is the cause of carrier lifetime degradation of the wafer. Carbon concentration and the crystal pulling conditions influence the cell performance of efficiency and open circuit voltage. We produced solar cells using different wafers of carbon concentration and the crystal pulling conditions, and pulled out the wafers in the middle of the cell process, examined the lifetime change. If the higher efficiency by advances in cell process technology, the difference of the crystal quality of wafer appear in the cell performance.