Journal
POLYMER
Volume 51, Issue 14, Pages 3031-3038Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2010.05.015
Keywords
Organic solar cell; Side chains; Low band gap
Categories
Funding
- Swedish Research Council (VR)
- NSF of China [50603027, 20834006, 50821062]
- 863 Program [2008AA05Z425]
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High efficiency organic solar cells (OSCs) require conjugated polymers with a low band gap, broad absorption in visible and IR region, high carrier mobility, and relatively high molecular weight as p-type donor materials. Flexible side chains on the rigid polymer backbone are crucial for the solubility of conjugated polymers. In this work, four polymers with the main chain structure of fluorene-thiophene-benzothiadiazole-thiophene and flexible side chains located on fluorene, thiophene, and benzothiadiazole moiety, respectively, have been synthesized by Suzuki-Miyaura-Schluter polycondensation. Photovoltaic device measurements with a device configuration of ITO/polymer:PC71BM blends/LiF/Al show that P1 carrying octyloxy chains on benzothiadiazole rings gives the best performance, with a power conversion efficiency of 3.1%. (C) 2010 Elsevier Ltd. All rights reserved.
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