期刊
NANO ENERGY
卷 48, 期 -, 页码 413-420出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2018.04.002
关键词
Chlorine substituted conjugated polymers; Benzodithiophene; Polymer solar cells; Power conversion efficiency
类别
资金
- National Natural Science Foundation of China (NSFC) [51503135, 51573120, 21504066, 21534003, 91633301]
- Ministry of science and technology [2016YFA0200700]
- Jiangsu Provincial Natural Science Foundation [BK20150332]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
In the past few years, fluorine atom has been widely introduced into organic semiconductor (OS) materials to improve the photovoltaic performance of polymer solar cells (PSCs). In contrast, chlorine atom is rarely concerned, although it is also a halogen element and is more easily introduced into OS materials. Herein, we designed and synthesized a new D-A-type two-dimension (2D)-conjugated polymer, PM7, containing a chlorinated-thienyl benzodithiophene (BDT-2Cl) donor unit and a benzodithiophene-4,8-dione acceptor unit. Compared to the control polymer PBDB-T without chlorine substitution, PM7 shows lower HOMO energy level, higher absorption coefficient, enhanced crystallinity and higher carrier mobility. Moreover, the toluene-processed PSCs based on PM7 as donor and small molecule n-OS IT-4F as acceptor achieved a high power conversion efficiency (PCE) of 13.1% with high open-circuit voltage (V-oc) of 0.88 V, short-circuit current density (J(sc)) of 20.9 mA cm(-2) and fill factor (FF) of 71.1%, while the PBDB-T: IT-4F-based PSC only exhibited a low PCE of 5.8% with low V-oc of 0.67 V, J(sc) of 15.0 mA cm(-2) and FF of 57.6%. The PCE of 13.1% is among the highest values reported for the PSCs to date. These results indicate that the chlorine substitution is a simple and effective strategy to design high-performance conjugated polymer photovoltaic materials.
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