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Mixture of  and PCBM giving morphological stability in organic solar cells
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11.Price of materials from Frontier Carbon Corporation, PC60BM: 800 $/gram, mix-PCBM: 600 $/gram.
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21. W.-R. Wu, U.-S. Jeng, C.-J. Su, K.-H. Wei, M.-S. Su, M.-Y. Chiu, C.-Y. Chen, W.-B. Su, and A.-C. Su, ACS Nano 5, 6233 (2011).
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Mix-PCBM, comprising [6,6]-phenyl-C61-butyric acid methyl ester (PC 60BM) and [6,6]-phenyl-C71-butyric acid methyl ester (PC 70BM), is a promising acceptor material for use in organic solar cells with higher device stability and cost performance. The inverted photovoltaic device using poly(3-hexylthiophene) (P3HT) and mix-PCBM exhibited a power conversion efficiency (PCE) of 3.34% (open-circuit voltage = 0.63 V, short-circuit current density = 8.55 mA/cm2, and fill factor = 0.60), slightly higher than that using P3HT and PC 60BM (PCE = 3.27%). More importantly, the mix-PCBM device was more stable to heating at 150 °C than the PC 60BM device, due to little morphological change, which was characterized by atomic force microscope and light absorption measurements.
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