[13p-PB9-1~49] 12.5 Organic solar cells

▲ [13p-PB9-3] Effects of thermal-annealing and processing-additive treatment on crystallization-induced phase separation in organic solar cells utilizing octapentyl tetrabenzotriazaporphyrins

〇(P)QuangDuy Dao¹, Takashi Uno¹, Masashi Ohmori¹, Koichi Watanabe¹, Hiromichi Itani^1,2, Akihiko Fujii¹, Yo Shimizu², Masanori Ozaki¹ (1.Osaka Univeristy, 2.AIST)

Keywords:organic solar cell,nanoscale phase separation,phthalocyanine

Although effects of thermal-annealing and processing-additive treatment on the crystallization-induced phase separation and the photovoltaic performance of bulk heterojunction (BHJ) organic solar cells (OSCs) have been extensively discussed, the comparison between them in one BHJ system is still limited. Herein, we report the effects of thermal-annealing and processing-additive treatment on crystallization-induced phase separation and photovoltaic performance in BHJ OSCs utilizing non-peripherally substituted octapentyl tetrabenzotriazaporphyrins (C5TBTAPH2) mixed in 1-(3-methoxycarbonyl)propyl-1-phenyl-(6,6)C71 ([70]PCBM). Although the crystallinity of C5TBTAPH2 in the BHJ thin films were improved using either thermal-annealing or processing-additive treatment, the optimum PCEs (1.4%) of the thermal-annealing treated devices was markedly lower than PCEs (4.2%) of the processing-additive treated devices. These results furthermore were discussed by taking the thermal properties and molecular aggregation of [70]PCBM into consideration.