期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 15, 期 6, 页码 2537-2544出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ee00595f
关键词
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资金
- National Natural Science Foundation of China [21734008, 52173185, 5212780017, 61721005]
- National Key Research and Development Program of China [2019YFA0705900]
- Zhejiang University
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences [A2107]
Manipulating the donor:acceptor energetics is crucial for achieving balanced charge separation and recombination in organic solar cells (OSCs). In this study, a non-fullerene electron acceptor, BTP-H2, was designed and synthesized to pair with the polymer donor PM6, showing strong intermolecular interaction and near-zero highest occupied molecular orbital (HOMO) offset. The results demonstrated efficient charge separation and optimized energy conversion, leading to high-performance OSCs with a power conversion efficiency (PCE) of 18.5% and a peak photon-to-electron response of approximately 90%.
Manipulating the donor:acceptor (D:A) energetics, e.g., the highest occupied molecular orbital (HOMO) offset, is the key to balancing the charge separation and charge recombination for high-performance organic solar cells (OSCs). Herein, we designed and synthesized a non-fullerene electron acceptor, i.e., BTP-H2, which shows strong intermolecular interaction and near-zero HOMO offset when pairing with polymer donor PM6. Transient absorption spectroscopies unveil that BTP-H2 exhibits a long-lived intra-moiety charge-separation state, which contributes to efficient hole transfer or charge generation, irrespective of the small HOMO offset. In addition, the small energetic offset reduces the non-radiative loss for a high open-circuit voltage (V-oc). As a result, we demonstrate high-performance OSCs with the best power conversion efficiency (PCE) of 18.5%, a high V-oc of 0.932 V and a peak photon-to-electron response of similar to 90%. Furthermore, ternary OSCs comprising PM6:BTP-H2:L8-BO exhibit a champion PCE of 19.2% (certified value of 18.8%) due to the improved balance between charge generation and charge recombination, and this represents the best among PCEs of single-junction OSCs.
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