Single-Junction Polymer Solar Cells with Over 10% Efficiency by a Novel Two-Dimensional Donor-Acceptor Conjugated Copolymer

被引:256
作者
Liu, Chang [1 ]
Yi, Chao [1 ]
Wang, Kai [1 ]
Yang, Yali [2 ]
Bhatta, Ram S. [1 ]
Tsige, Mesfin [1 ]
Xiao, Shuyong [2 ]
Gong, Xiong [1 ]
机构
[1] Univ Akron, Coll Polymer Sci & Polymer Engn, Akron, OH 44325 USA
[2] 1 Mat Inc, Dorval, PQ H9P 1K2, Canada
基金
美国国家科学基金会;
关键词
single-junction polymer solar cells; 10 percent efficiency; two-dimensional conjugated polymer; PTB7; derivative; extended conjugation; compact pi-pi stacking; PHOTOVOLTAIC PROPERTIES; ABSORPTION-SPECTRA; PERFORMANCE; POLYTHIOPHENES;
D O I
10.1021/am509047g
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Recent advances in bulk heterojunction (BHJ) polymer solar cell (PSC) performance have resulted from compressing the band gap to enhance the short-circuit current density (J(SC)) while lowering the highest occupied molecular orbital to increase the open-circuit voltage (V-OC) and consequently enhance the power conversion efficiencies (PCEs). However, PCEs of PSCs are still constrained by a low J(SC), small V-OC, and low fill factor (FF). In this study, we report 10.12% PCE from single-junction PSCs based on a novel two-dimensional (2D) conjugated copolymer. By introduction of conjugated 5-alkylthiophene-2-yl side chains to substitute nonconjugated alkoxy side chains in one-dimensional (1D) poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7), a novel 2D donor-acceptor low-band-gap conjugated copolymer, poly[[4,8-bis[(5-ethylhexyl)thienyl]benzo[1,2-b;3,3-b]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7-DT), is developed. 2D PTB7-DT is further systematically investigated by absorption spectroscopy, cyclic voltammetry, charge carrier mobility measurement, thin film morphology, and wide-angle X-ray diffraction and compared with 1D PTB7. In comparison with 1D PTB7, 2D PTB7-DT possesses a narrower band gap, tighter pi-pi stacking, and higher charge carrier mobility. These results are consistent with the observation from first-principle calculations. Consequently, the single-junction PSCs based on 2D PTB7-DT exhibit a PCE of 10.12% with a high J(SC), larger V-OC, and high FF in comparison with the PSCs based on 1D PTB7.
引用
收藏
页码:4928 / 4935
页数:8
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