Citation: Wen Zhenchuan, Ma Xuejian, Yang Xiaoyu, Bi Pengqing, Niu Mengsi, Zhang Kangning, Feng Lin, Hao Xiaotao. Effects of various donor: acceptor blend ratios on photophysical properties in non-fullerene organic bulk heterojunctions[J]. Chinese Chemical Letters, ;2019, 30(5): 995-999. doi: 10.1016/j.cclet.2019.01.028 shu

Effects of various donor: acceptor blend ratios on photophysical properties in non-fullerene organic bulk heterojunctions

a.
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, China
b.
ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, Victoria, 3010, Australia

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Received Date: 24 December 2018
Revised Date: 22 January 2019
Accepted Date: 24 January 2019
Available Online: 24 May 2019

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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']-dithiophene (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 (J_sc) and D:A ratios demonstrates an axisymmetric trend. When the blending ratio of D:A deviates from the optimal ratio, the symmetrically decreased J_sc 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 of π-π stacking corresponding to molecular packing has not changed significantly, and the bi-continuous percolation pathways were not obviously influenced.
- Photophysical properties,
- Non-fullerene,
- Bulk heterojunctions,
- Various blend ratios,
- Organic solar cells
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沈阳化工大学材料科学与工程学院沈阳 110142