• Frontiers of Optoelectronics
  • Vol. 6, Issue 4, 418 (2013)
Debin NI1, Dong YANG2, Shuying MA1, Guoli TU1、*, and Jian ZHANG2
Author Affiliations
  • 1Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory of Clean Energy, Dalian 116023, China
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    DOI: 10.1007/s12200-013-0343-9 Cite this Article
    Debin NI, Dong YANG, Shuying MA, Guoli TU, Jian ZHANG. Side chains and backbone structures influence on 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DTBT)-based low-bandgap conjugated copolymers for organic photovoltaics[J]. Frontiers of Optoelectronics, 2013, 6(4): 418 Copy Citation Text show less

    Abstract

    Five 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DTBT)-based conjugated copolymers with controlled molecular weight were synthesized to explore their optical, energy level and photovoltaic properties. By tuning the positions of hexyl side chains on DTBT unit, the DTBTfluorene copolymers exhibited very different aggregation properties, leading to 60 nm bathochromic shift in their absorptions and the corresponding power conversion efficiencies (PCEs) value of photovoltaic cells varied from 0.38%, 0.69% to 2.47%. Different copolymerization units, fluorene, carbazole and phenothiazine were also investigated. The polymer based on phenothiazine exhibited lower PCE value due to much lower molecular weight owing to its poor solubility, although phenothiazine units were expected to be a better electron donor. Compared with the fluorene-based polymer, the carbazole-DTBT copolymer showed higher short circuit current density (Jsc) and PCE value due to its better intermolecular stacking.
    Debin NI, Dong YANG, Shuying MA, Guoli TU, Jian ZHANG. Side chains and backbone structures influence on 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DTBT)-based low-bandgap conjugated copolymers for organic photovoltaics[J]. Frontiers of Optoelectronics, 2013, 6(4): 418
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