- Tuning photovoltaic performance of 9,9-dioctylfluorene-alt-5,7- bis(thiophen-2-yl)-2,3-biphenylthieno[3,4-b]pyrazine copolymeric derivatives by attaching additional donor units in pendant phenyl ring
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A class of the 9,9-dioctylfluorene-alt-5,7-bis(thiophen-2-yl)-2,3- biphenylthieno [3,4-b]pyrazine copolymeric derivatives (PFO-3ThPz-D) attaching additional donor (D) units in the pendant phenyl ring with a D-A D structure was synthesized and investigated, where the additional D unit is a substituent group of fluorene, carbazole, and triphenylamine (Tpa). Their photovoltaic properties were significantly tuned by these pending donor units. Among these copolymers, the PFO-3ThPz-Tpa exhibited the best photovoltaic properties in the bulk heterojunction polymeric solar cells (BHJ-PSC). The maximum power conversion efficiency (PCE) of 2.09% and the highest circuit current density (Jsc) of 7.91 mA/cm2 were obtained in the cell using a blend of PFO-3ThPz-Tpa and PC60BM (1:3, w/w) as active layer, which are 2.5 and 1.8 times higher than those corresponding levels in the other cell using the parent PFO-3ThPz-Ph copolymer instead of PFO-3ThPz-Tpa as donor, respectively. While PC60BM was replaced by PC70BM, the PFO-3ThPz-Tpa-based BHJ-PSC exhibited better photovoltaic properties with PCE of 3.08% and Jsc of 10.3 mA/cm2. This work demonstrated that attaching donor units into the D-A-based copolymeric side-chain is a simple and effective method to improve the photovoltaic properties for the resulting copolymers. Copyright
- Li, Jianmin,Deng, Xianping,Zhang, Zhiyong,Wang, Yafei,Liu, Yu,He, Keqi,Huang, Ying,Tao, Qiang,Quan, Lixia,Zhu, Weiguo
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p. 4686 - 4694
(2013/01/15)
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- Dual functions of a novel low-gap polymer for near infra-red photovoltaics and light-emitting diodes
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We have synthesised and characterised a new low-gap conjugated polymer, with a broad absorption profile. In blends with a C70 derivative we demonstrate power conversion efficiencies of 0.76%. We show electroluminescence from the polymer peaking at 956 nm, and quantum efficiency of 0.02% in a blend.
- Li, Penglei,Fenwick, Oliver,Yilmaz, Seyfullah,Breusov, Dietrich,Caruana, Daren J.,Allard, Sybille,Scherf, Ullrich,Cacialli, Franco
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p. 8820 - 8822
(2011/09/21)
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- Synthesis of thieno[3,4-b]pyrazine-based and 2,1,3-benzothiadiazole-based donor-acceptor copolymers and their application in photovoltaic devices
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Two kinds of thieno[3,4-6]pyrazine-based monomers, 2,3-dimethyl-5,7-di(2- bromothien-5-yl)-thieno[3,4-b]pyrazine and 2,3-diphenyl-5,7-di(2-bromothien-5- yl)-thieno[3,4-p]pyrazine, were synthesized via an improved synthetic route. These two monomers and 4,7-di(2-bromothien-5-yl)-2,l,3-benzothiadiazole were copolymerized with three donor segments (fluorene, carbazole, and indolocarbazole) separately by a Suzuki cross-coupling reaction to give six types of 5,7-dithien-2-yl-thieno[3,4-p]pyrazine (DTTP)-based donor- acceptor (D-A) copolymers (TP1-6) and three types of 5,7-dithien-2-yl-2,l,3- benzothiadiazole (DTBT)-based D-A copolymers (PF-DTBT, PC-DTBT, and PIC-DTBT). The optical properties, electrochemical behavior, and energy levels of these nine copolymers were investigated. The photovoltaic performance of the copolymers was compared and discussed considering their energy levels.
- Zhou, Erjun,Cong, Junzi,Yamakawa, Shimpei,Wei, Qingshuo,Nakamura, Motoshi,Tajima, Keisuke,Yang, Chunhe,Hashimoto, Kazuhito
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experimental part
p. 2873 - 2879
(2011/10/09)
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