期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 1, 页码 151-156出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c03177
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资金
- National Key Research and Development Program of China [2017YFA0207700]
- National Key Research and Development Program of Zhejiang Province [2018C04SA170313]
- Outstanding Youth Fund of Zhejiang Natural Science Foundation of China [LR18F050001]
- Natural Science Foundation of China [61804134, 61705194]
Researchers developed a series of ternary organic photovoltaic devices, finding that the open-circuit voltage increases linearly with the increase of ITIC third content. They discovered that both the effective charge-transfer states and nonradiative recombination losses in the ternary blends collectively contribute to the tunability of V-OC in NFA-based ternary OSCs.
Although the power conversion efficiencies (PCEs) of the state-of-the-art organic solar cells (OSCs) have exceeded 17%, the organic photovoltaic devices still suffer from considerable voltage losses compared with the inorganic or perovskite solar cells. Therefore, the optimization of opencircuit voltage (V-OC) is of great significance for the improvement of the photovoltaic performance of OSCs. The origins of V-OC have been well-established in the binary system; however, the understanding of V-OC in non-fullerene acceptor (NFA)-based ternary OSCs is still lacking. Herein, we have developed a series of ternary organic photovoltaic devices, exhibiting nearly linear increased V-OC as the increase of ITIC third content. We found that both the effective charge-transfer (CT) states and the nonradiative recombination losses of the bulk-heterojunction (BHJ) are altered in the ternary blends, and they collectively contribute to the tunable V-OC. Our results provide a perspective for understanding the origin of V-OC in NFA-based ternary OSCs.
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