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3 November 2006 Effect of side-chains on low band gap polymer photovoltaic devices
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The effect of side-chains on the molecular weight and the optical and electrical property of a low band gap copolymer poly{(9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-decyloxythien-2-yl)-2,1,3-benzothiadiazole]-5',5"-diyl} (PF-co-DTB) was studied. The decyloxy side-chains help to increase molecular weight (Mw = 115,000) and decrease the band gap (1.78 eV) as well as the oxidation potential (-5.4 eV). Zero-field mobility of 2×10-5 cm2/Vs is measured in hole-only devices. Photovoltaic devices based on PF-co-DTB/fullerene bulk-heterojunction show power conversion efficiency of up to 1.6% under air mass 1.5G, 100 mW/cm2 illumination. Side-chains effect on the photovoltaic devices studies show the trade-off between short circuit current increase and open-circuit voltage drop. Thermal annealing on device performance is also discussed.
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Yan Yao, Chenjun Shi, Qibing Pei, and Yang Yang "Effect of side-chains on low band gap polymer photovoltaic devices", Proc. SPIE 6334, Organic Photovoltaics VII, 633415 (3 November 2006);

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