期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 6, 页码 2359-2365出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja5123182
关键词
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资金
- National Research Foundation - Korean Government [2012M3A6A7055540, 2013R1A2A1A03069803, 2012R1A1A2005855]
- New & Renewable Energy Program of KETEP Grant - Ministry of Trade, Industry & Energy, Republic of Korea [20133030011330]
- U.S. Department of Energy [DE-AC02-05CH11231]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20133030011330] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2013R1A2A1A03069803, 2012M3A6A7055540] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The molecular weight of a conjugated polymer is one of the key factors determining the electrical, morphological, and mechanical properties as well as its solubility in organic solvents and miscibility with other polymers. In this study, a series of semicrystalline poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2FB(T)) polymers with different number-average molecular weights (M(n)s) (PPDT2FBT(L), M-n = 12 kg/mol; PPDT2FBT(M), M-n= 24 kg/mol; PPDT2FBT(H), M-n= 40 kg/mol) were synthesized, and their photovoltaic properties as electron donors for all-polymer solar cells (all-PSCs) with poly[[N,N'-bis(2-octyldodecyl)-napthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)] (P(NDI2OD-T-2)) acceptor were studied. The Mn effect of PPDT2FBT on the structural, morphological, electrical, and photovoltaic properties was systematically investigated. In particular, tuning the Mn induced dramatic effects on the aggregation behaviors of the polymers and their bulk heterojunction morphology of all-PSCs, which was thoroughly examined by grazing incident X-ray scattering, resonant soft X-ray scattering, and other microscopy measurements. High Mn PPDT2FBTH promoted a strong face-on geometry in the blend film, suppressed the formation of an excessively large crystalline domain, and facilitated molecularly intermixed phases with P(NDI2OD-T-2). Therefore, the optimized all-PSCs based on PPDT2FBTH/P(NDI2OD-T-2) showed substantially higher hole and electron mobilities than those of PPDT2FBTL/P(NDI2OD-T-2), leading to a power conversion efficiency exceeding 5%, which is one of the highest values for all-PSCs reported thus far.
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