Abstract
Mix-PCBM, comprising [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) and [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM), 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 PC60BM (PCE = 3.27%). More importantly, the mix-PCBM device was more stable to heating at 150 °C than the PC60BM device, due to little morphological change, which was characterized by atomic force microscope and light absorption measurements.
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