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Proceedings Paper

Effects of side-chains on low band gap polymer photovoltaic devices
Author(s): Yan Yao; Chenjun Shi; Qibing Pei; Yang Yang
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Paper Abstract

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.

Paper Details

Date Published: 3 November 2006
PDF: 5 pages
Proc. SPIE 6334, Organic Photovoltaics VII, 633415 (3 November 2006); doi: 10.1117/12.683077
Show Author Affiliations
Yan Yao, Univ. of California, Los Angeles (United States)
Chenjun Shi, Univ. of California, Los Angeles (United States)
Qibing Pei, Univ. of California, Los Angeles (United States)
Yang Yang, Univ. of California, Los Angeles (United States)

Published in SPIE Proceedings Vol. 6334:
Organic Photovoltaics VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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