Synthesis and characterization of naphtho[2,1‐b:3,4‐b′]dithiophene‐based polymers with extended π‐conjugation systems for use in bulk heterojunction polymer solar cells |
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| Authors: | Jae‐Wan Jang Hyojung Cha Yun‐Hi Kim Soon‐Ki Kwon Chan Eon Park |
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| Affiliation: | 1. School of Materials Science and Engineering and Research Institute for Green Energy Convergence Technology (REGET), Gyeongsang National University, , Jin‐ju, 660‐701 Republic of Korea;2. POSTECH Organic Electronics Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology, , Pohang, 790‐784 Republic of Korea;3. Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, , Jin‐ju, 660‐701 Republic of Korea |
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| Abstract: | Two novel polymeric semiconductor materials based on naphtho[2,1‐b:3,4‐b']dithiophene (NDT), PNDT‐TTT and PNDT‐TET , were designed and synthesized. These synthesized polymers were tested in bulk heterojunction solar cells as blends with the acceptor [6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM). PNDT‐TTT contained tri‐thiophene units, and PNDT‐TET contained bi‐thiophene units coupled by ethylenic linkages. Comparison to the properties of PNDT‐T , which contained single thiophene units, these polymers exhibit red‐shifted absorption spectra as a result of the enhanced conjugation lengths. These effects resulted in high short circuit currents (JSC) in the organic solar cells. The PNDT‐TET ‐ and PNDT‐TTT ‐based devices exhibited considerably better photovoltaic performances, with power conversion efficiencies of 3.5 and 3.3%, respectively, compared to the PNDT‐T ‐based device (1.3%). © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 4742–4751 |
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| Keywords: | bulk heterojunction solar cells conducting polymers conjugated polymers extended π ‐conjugation high‐performance polymers morphology naphthodithiophene organic solar cells |
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