naa a22 4500 510729444 CHVBK 20180411082947.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s12200-013-0343-9 doi (NATIONALLICENCE)springer-10.1007/s12200-013-0343-9 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 [Elektronische Daten] [Debin Ni, Dong Yang, Shuying Ma, Guoli Tu, Jian Zhang] 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 DTBT-fluorene 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 (J sc) and PCE value due to its better intermolecular stacking. Higher Education Press and Springer-Verlag Berlin Heidelberg, 2013 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DTBT) nationallicence conjugated polymers nationallicence low-bandgap nationallicence organic photovoltaics nationallicence Ni Debin Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut Yang Dong State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian National Laboratory of Clean Energy, 116023, Dalian, China aut Ma Shuying Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut Tu Guoli Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut Zhang Jian State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian National Laboratory of Clean Energy, 116023, Dalian, China aut Frontiers of Optoelectronics Springer Berlin Heidelberg 6/4(2013-12-01), 418-428 2095-2759 6:4<418 2013 6 12200 https://doi.org/10.1007/s12200-013-0343-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12200-013-0343-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ni Debin Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Yang Dong State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian National Laboratory of Clean Energy, 116023, Dalian, China aut NATIONALLICENCE 700 1- Ma Shuying Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Tu Guoli Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, 430074, Wuhan, China aut NATIONALLICENCE 700 1- Zhang Jian State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian National Laboratory of Clean Energy, 116023, Dalian, China aut NATIONALLICENCE 773 0- Frontiers of Optoelectronics Springer Berlin Heidelberg 6/4(2013-12-01), 418-428 2095-2759 6:4<418 2013 6 12200 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer