Comparison of thiophene- and selenophene-bridged donor-acceptor low band-gap copolymers used in bulk-heterojunction organic photovoltaics

被引:82
作者
Chen, Hung-Yang [1 ,2 ,3 ]
Yeh, Shih-Chieh [1 ]
Chen, Chin-Ti [1 ]
Chen, Chao-Tsen [3 ]
机构
[1] Acad Sinica, Inst Chem, Taipei 11529, Taiwan
[2] Acad Sinica, TIGP, Nano Sci & Technol Program, Taipei 11529, Taiwan
[3] Natl Taiwan Univ, Dept Chem, Taipei 11617, Taiwan
关键词
FIELD-EFFECT TRANSISTOR; OPEN-CIRCUIT VOLTAGE; POLYMER SOLAR-CELLS; CONJUGATED POLYMERS; MAIN-CHAIN; DERIVATIVES; EFFICIENCY; UNITS; SEMICONDUCTORS; BISELENOPHENE;
D O I
10.1039/c2jm33735e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report a detailed comparison of absorption spectroscopy, electrochemistry, DFT calculations, field-effect charge mobility, as well as organic photovoltaic characteristics between thiophene- and selenophene-bridged donor-acceptor low-band-gap copolymers. In these copolymers, a significant reduction of the band-gap energy was observed for selenophene-bridged copolymers by UV-visible absorption spectroscopy and cyclic voltammetry. Field-effect charge mobility studies reveal that the enhanced hole mobility of the selenophene-bridged copolymers hinges on the solubilising alkyl side chain of the copolymers. Both cyclic voltammetry experiments and theoretical calculations showed that the decreased band-gap energy is mainly due to the lowering of the LUMO energy level, and the raising of the HOMO energy level is just a secondary cause. These results are reflected in a significant increase of the short circuit current density (J(SC)) but a slight decrease of the open circuit voltage (V-OC) of their bulk-heterojunction organic photovoltaics (BHJ OPVs), of which the electron donor materials are a selenophene-bridged donor-acceptor copolymer: poly {9-dodecyl-9H-carbazole-alt-5,6-bis(dodecyloxy)-4,7-di(selenophen-2-yl) benzo[c][1,2,5]-thiadiazole} (pCzSe) or poly {4,8-bis(2-ethylhexyloxy)benzo[1,2-b;4,5']dithiophene-alt-5,6-bis(dodecyloxy)-4,7-di(selenophen-2-yl)benzo[c] [1,2,5]-thiadiazole} (pBDTSe), or a thiophene-bridged donor-acceptor copolymer: poly {9-dodecyl-9H-carbazole-alt-5,6-bis(dodecyloxy)-4,7-di(thiophen-2-yl)benzo[c][1,2,5]-thiadiazole} (pCzS) or poly {4,8-bis(2-ethylhexyloxy)benzo[1,2-b;4,5-b']dithiophene-alt-5,6-bis(dodecyloxy)-4,7-di(thiophen-2-yl) benzo[c][1,2,5]-thiadiazole} (pBDTS); the electron acceptor material is [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Judging from our device data, the potential Se-Se interactions of the selenophene-bridged donor-acceptor copolymers, which is presumably beneficial for the fill factor (FF) of BHJ OPVs, is rather susceptible to the device fabrication conditions.
引用
收藏
页码:21549 / 21559
页数:11
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