[12p-A402-1~17] 12.5 Organic solar cells

△ [12p-A402-4] Light-induced ESR spectroscopy observation of long-lived charge states in PTzBT:ITIC:PCBM polymer solar cells and elucidation of device performance deterioration mechanism

〇(D)Dong Xue¹, 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, charge accumulation states

Polymer solar cells have been extensively studied because of its low-cost, large-area production and flexible characteristics. Recently, the power conversion efficiency (PCE) of polymer solar cells have been greatly improved. However, the internal degradation mechanism has not yet been completely clarified. Inverted-type polymer solar cells using PTzBT:ITIC:PCBM as an active layer have attracted much attention because of their high PCEs and durability by adding ITIC to the active layer. In this study, we report electron spin resonance (ESR) spectroscopy of PTzBT:ITIC:PCBM polymer solar cells to investigate the deterioration mechanism and the effect of ITIC on the device performance from a microscopic viewpoint. We measured the cells and thin-film samples using operando light-induced ESR spectroscopy.