期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 182, 期 -, 页码 45-51出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2018.03.014
关键词
Organic solar cells; Ternary blend; Charge transfer; Energy-level cascade
资金
- Nature Science Foundation of Hebei province, China [E2017201188]
- Applied Basic Research Program of Hebei province, China [14964306D]
- Fund of Hebei Science and Technology Bureau [16211241]
Recently, studies on ternary organic solar cells (OSCs) have revealed their potentials for achieving the improved device performances. However, owing to the trade-off between the short-circuit current density J(SC)) and open circuit voltage (V-OC), the mismatch of the energy levels between donors and acceptors leads to a large energy loss and then leads to a lower V-OC in most ternary systems. In this study, we incorporated 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene) - 5-methylindanone) - 5,5,11,11-tetrakis (4-hexylphenyl)-dithieno [2,3-d:2',3'-d']-s-indaceno [1,2-b:5,6-b']-dithiophene (IT-M) into a PTB7-Th:PC71BM host system as the third component, which has a higher energy level of the lowest unoccupied molecular orbital (LUMO) than that of PC71BM. The introduction of IT-M adjusts the energy-level cascade, enhances the absorption intensity and modulates the film morphology, which facilitate the charge generation, enhance the charge transport, and suppress the charge recombination, as manifested by the significantly enhanced V-OC, J(SC), and fill factor (FF). Therefore, the results indicate that a simultaneous enhancement of V-OC, J(SC), and FF can be achieved by incorporation of IT-M in ternary OSCs, providing a higher efficiency.
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