[18p-G202-1~9] 12.5 Organic solar cells

[18p-G202-7] Analysis of Charge States in Highly Stable Polymer Solar Cells Using Light-Induced ESR Spectroscopy

〇Dong Xue¹, Shinpei Kamiya¹, Masahiko Saito², Itaru Osaka², Kazuhiro Marumoto^1,3 (1.Univ. Tsukuba, 2.Hiroshima Univ, 3.TREMS, Univ. Tsukuba)

Keywords:electron spin resonance, organic solar cells, degradation mechanism

Polymer solar cells have been extensively studied because of its low-cost, large-area production and flexible characteristics. Recently, the power conversion efficiency of polymer solar cells has been greatly improved. However, the internal degradation mechanism is still unknown. Inverted-type polymer solar cells using PTzNTz-BOBO have attracted much attention because of their high PCEs and stability. In this study, we report electron spin resonance (ESR) spectroscopy of highly stable polymer solar cells using PTzNTz-BOBO to investigate the degradation mechanism of the device performances from a microscopic viewpoint. We observed the correlation between the increase in the number of spins (N_spin) and the decrease in the short-circuit current density (J_sc).