[19p-W531-1~19] 12.5 Organic solar cells

[19p-W531-11] Direct observation of charge accumulation in PCE10:PC₇₁BM polymer solar cells under device operation by light-induced ESR

〇(M1)VanadianAstari Rachmat¹, Takaya Kubodera¹, Donghyun Son¹, Kazuhiro Marumoto^1,2 (1.Division of Materials Science,Univ. of Tsukuba, 2.TIMS,Univ. of Tsukuba)

Keywords:polymer solar cell,electron spin resonance,charge accumulation

Organic solar cell have attracted high attention as a next generation solar cell because there are no resource constraints and possibilities to fabricate printable, lightweight and flexible device structure with a low-cost production at normal temperature and pressure. Poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene)-2-carboxylate-2-6-diyl)] (PCE10) is one of the new generation of organic solar cell p-type polymers that has achieved efficiencies of over 9%.
In this study, we report on an electron spin resonance (ESR) study of high efficiency organic solar cells using blend films of the p-type semiconductor PCE10 and n-type semiconductor phenyl-C₇₁ -butyric acid methyl ester (PC₇₁BM) as the light harvesters with light-induced ESR to investigate the accumulated charge carriers under device operation and their correlation with the degradation of the device performance from a microscopic viewpoint.