Synthesis and characterization of a thiadiazole/benzoimidazole‐based copolymer for solar cell applications |
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| Authors: | Guan‐yu Chen Shang‐che Lan Po‐yu Lin Chih‐wei Chu Kung‐hwa Wei |
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| Institution: | 1. Department of Material Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan;2. Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan;3. Department of Photonics, National Chiao Tung University, Hsinchu 300, Taiwan |
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| Abstract: | In this study, we synthesized a new polymer, PCTDBI , containing alternating carbazole and thiadiazole‐benzoimidazole (TDBI) units. This polymer (number‐average molecular weight = 25,600 g mol?1), which features a planar imidazole structure into the polymeric main chain, possesses reasonably good thermal properties (Tg = 105 °C; Td = 396 °C) and an optical band gap of 1.75 eV that matches the maximum photon flux of sunlight. Electrochemical measurements revealed an appropriate energy band offset between the polymer's lowest unoccupied molecular orbital and that of PCBM, thereby allowing efficient electron transfer between the two species. A solar cell device incorporating PCTDBI and PCBM at a blend ratio of 1:2 (w/w) exhibited a power conversion efficiency of 1.20%; the corresponding device incorporating PCTDBI and PC71BM (1:2, w/w) exhibited a PCE of 1.84%. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010 |
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| Keywords: | carbazole conjugated polymer copolymerization heteroatom‐containing polymers imidazole solar cell |
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