Journal
NANO ENERGY
Volume 63, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.103888
Keywords
Organic solar cell; Ternary strategy; Power conversion efficiency; Energy transfer
Categories
Funding
- National Natural Science Foundation of China [61675017, 61377029, 61564003, 21572171]
- Beijing Natural Science Foundation [4192049]
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A series of organic solar cells (OSCs) were prepared with J71 as donor and IT-4F, T6Me or T6Me:IT-4F as acceptor(s), respectively. The two binary OSCs exhibit the same open circuit voltage (V-OC), complementary short circuit current density (J(SC)) and fill factor (FF). The same V-OC of binary OSCs with J71 as donor indicate the similar lowest unoccupied molecular orbits (LUMO) levels of IT-4F and T6Me. Meanwhile, IT-4F and T6Me have complementary photon harvesting range, exhibiting great potential in preparing efficient ternary OSCs. The optimized ternary OSCs exhibit a 13.16% power conversion efficiency (PCE) with 50 wt% IT-4F in acceptors, resulting from the enhanced J(SC) and FF. The FFs of ternary OSCs can be gradually improved along with IT-4F content increase, indicating that the two acceptors may prefer to form an alloyed state. The alloyed state of two acceptors should be beneficial to Forster energy transfer from IT-4F to T6Me, providing another channel for improving exciton utilization efficiency. This work indicates that alloyed model should have great potential in preparing efficient ternary OSCs with large content of the third component by fully exerting the advantages of used materials.
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