期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 48, 期 20, 页码 4567-4573出版社
WILEY
DOI: 10.1002/pola.24248
关键词
2H-benzimidazole; conjugated polymers; copolymerization; cyclopentadithiophene; thin films
资金
- Korea government (MEST) [2010-0015069]
- Ministry of Education, Science and Technology of Korea [K20607000004]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10037176] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-00038, 2010-0015069, R32-2008-000-10174-0, 과C6B2010] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A series of new semiconducting polymers based on 4,4-dihexyl-4H-cyclopenta[2,1-b: 3,4-b'] dithiophene, 2,2-dihexyl-2H- benzimidazole, and thiophene units was synthesized. The polymers show good solubility at room temperature in organic solvents owing to long alkyl chain in new acceptor, 2,2dihexyl- 2H-benzimidazole. The advantage of dihexyl-2H-benzimidazole compared to the benzothiadiazole is to improve the solubility of the polymer. It was found that these polymers can finely be tuned for photovoltaic application by adjusting the contents ratio of the dihexyl-2H-benzimidazole unit. The spectra of the solid films show absorption bands with maximum peaks in the range of 421-577 nm and the absorption onsets at 588-683 nm, corresponding to band gaps of 2.11-1.82 eV. The devices with PCPDTDTHBI-1:PC71BM showed an open-circuit voltage (V-OC) of 0.46 V, a short-circuit current density (J(SC)) of 3.83 mA/cm(2), and a fill factor of 0.36, giving a power conversion efficiency of 0.64%. Decrease of the dihexyl-2H-benzimidazole contents in the polymers induced red-shift of the UV absorptions, and increased VOC and JSC values, to improve the efficiency of organic photovoltaics. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 4567-4573, 2010
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