期刊
CHEMICAL SCIENCE
卷 7, 期 9, 页码 6167-6175出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6sc01791f
关键词
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资金
- National Natural Science Foundation of China (NSFC) [21572171, 91433201]
- National Basic Research Program of China (973 Program) [2013CB834805]
- Innovative Research Group of Hubei Province [2015CFA014]
- International Science & Technology Cooperation Program of China [2014DFA52820]
Two new polymers, PDTPO-IDT and PDTPO-IDTT, are synthesized through copolymerization of 4-(2-octyldodecyl)-dithieno[3,2-b:2',3'-d]pyridin-5(4H)-one (DTPO) with indacenodithiophene (IDT) or indacenodithieno[3,2-b] thiophene (IDTT). The rational combination of the planar DTPO unit with ladder-type IDT and IDTT units endows the resulting copolymers with wide optical bandgaps of ca. 2.05 eV, low HOMO energy levels of ca. -5.32 eV and good hole-transporting abilities with a hole mobility of 1.0 x 10(-3) cm(2) V-1 s(-1). The polymer solar cell (PSC) in a conventional structure based on PDTPO-IDT as donor and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) as acceptor achieves a high power conversion efficiency (PCE) of up to 7.33%, the highest value for PSCs based on polymers with optical bandgap over 2.0 eV to date, along with a remarkable open-circuit voltage (V-oc) approaching 0.97 V. The performance of the PDTPO-IDTT based PSC is slightly behind this with a moderate PCE of 5.47% under the same conditions. The relationship between the copolymer structures and optoelectronic properties as well as photovoltaic performance are comprehensively investigated by experiments and theoretical simulations.
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