[6a-A501-1~12] 12.5 Organic solar cells

△ [6a-A501-8] Bimolecular Recombination and Fill Factor in Crystalline Polymer Solar Cells

〇Tomohiro Fukuhara¹, Tamai Yasunari¹, Osaka Itaru², Ohkita Hideo¹ (1.Kyoto Univ., 2.Hiroshima Univ.)

Keywords:polymer solar cell, bimolecular recombination, fill factor

Bimolecular charge recombination is a major loss process in polymer solar cells. In this work, we performed transient photovoltage (TPV) and transient photocurrent (TPC) measurements in polymer solar cells which exhibit different fill factors and evaluated charge carrier lifetime and charge carrier density. Experimental J–V curves were well reproduced by using these recombination parameters. Therefore, it was suggested that reduced bimolecular recombination is necessary to enhance power conversion efficiency further.