首页|Effects of various donor:acceptor blend ratios on photophysical properties in non-fullerene organic bulk heterojunctions
Effects of various donor:acceptor blend ratios on photophysical properties in non-fullerene organic bulk heterojunctions
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The composition ratio of donor and acceptor materials in organic bulk heterojunction (BHJ) is one of the key parameters to govern the performance in organic solar cells (OSCs). Therefore, high-performance non-fullerene organic bulk heterojunction consisting of poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b' ]dithiophene))-co-(1,3-di(5-thiophene-2-yl)–5,7-bis(2-ethylhexyl) benzo[1,2-c:4,5-c']dithiophene-4,8-dione)] (PBDB-T) and 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))–5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2' ,3'-d' ]-s-indaceno[1,2-b:5,6-b' ]-dithio-phene (ITIC) are used to investigate the correlation among various donor: acceptor (D:A) ratios, photophysical properties and photovoltaic performance. Interestingly, the function of short-circuit current (Jsc) and D:A ratios demonstrates an axisymmetric trend. When the blending ratio of D:A deviates from the optimal ratio, the symmetrically decreased Jsc is derived from a reduction in the D:A interface or amorphous region. Research on the steady-state photoluminescence (PL), the time-resolved fluorescence spectroscopy measurements, atomic force microscopic (AFM) and grazing-incidence small angle X-rays scattering (GIWAXS) indicates no significant variation in energy loss in the process of changing D:A ratios in BHJs. With high donor or acceptor content, the domain size improves significantly, but the distance ofπ-πstacking corresponding to molecular packing has not changed significantly, and the bi-continuous percolation pathways were not obviously influenced.
Photophysical propertiesNon-fullereneBulk heterojunctionsVarious blend ratiosOrganic solar cells
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, China
ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, Victoria, 3010, Australia
This work was supported by the National Natural Science Foundation of ChinaThis work was supported by the National Natural Science Foundation of ChinaThis work was supported by the National Natural Science Foundation of Chinaand Key R&D Programs of Shandong Province, ChinaX.T. Hao also acknowledges support from the ARC Centre of Excellence in Exciton Scienceauthors would like to thank the Shanghai Synchrotron Radiation Facility
Nos. 616311660011157418111774204 2018GGX103004 CE170100026beamline BL16B1 for providing the beam time for GIWAXS measurements
NETL
NSTL
万方数据
维普
