Achieving 17.38% efficiency of ternary organic solar cells enabled by a large-bandgap donor with noncovalent conformational locking
Achieving 17.38% efficiency of ternary organic solar cells enabled by a large-bandgap donor with noncovalent conformational locking
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实现%2017.38%%20efficiency%20of%20ternary%20organic%20solar%20cells%20enabled%20by%20a%20large-bandgap%20donor%20with%20noncovalent%20conformional%20locking
DOI：
10.1039/d1ta02075g
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发表时间：
2021
影响因子：
11.9
通讯作者：
Tan Songting
中科院分区：
文献类型：
--
作者：
Xu Linyong;Tao Wuxi;Liu Heng;Ning Junhua;Huang Meihua;Zhao Bin;Lu Xinhui;Tan Songting
一个大的带隙供体，BTBR-2F，基于非共价构象锁定已被设计和合成，以实现更多的互补吸收与PM 6：Y 6共混物在近紫外区。具有20%BTBR-2F的三元共混物膜实现了具有纳米纤维网络结构和小域尺寸的最佳形态，这导致最有效的激子解离、最高的电荷迁移率和最低的电荷复合。此外，BTBR-2F具有比PM 6更低的HOMO和LUMO能级，这导致三元OSC中更有效的能量/电荷转移和更高的Voc。因此，具有20%BTBR-2F的三元器件实现了17.38%的最高效率，Voc为0.859 V，Jsc为27.30 mA cm−2，FF为74.11%。该研究提出了一种有效的非共价构象锁定策略，用于调节小分子供体的能级、吸收带和分子聚集，以用于具有全面改善的光伏参数的高性能三元有机太阳能电池。
A large-bandgap donor, BTBR-2F, based on noncovalent conformational locking has been designed and synthesized to achieve more complementary absorption with a PM6:Y6 blend in the near-ultraviolet region. The ternary blend film with 20% BTBR-2F achieves the best morphology with a nanofibrous network structure and small domain size, which results in the most efficient exciton dissociation, highest charge mobilities, and lowest charge recombination. Moreover, BTBR-2F possesses lower HOMO and LUMO energy levels than PM6, which leads to more efficient energy/charge transfer and higher Voc in ternary OSCs. Therefore, the ternary device with 20% BTBR-2F achieves the highest efficiency of 17.38%, with a Voc of 0.859 V, Jsc of 27.30 mA cm−2, and FF of 74.11%. The study presents an efficient noncovalent conformational locking strategy to tune the energy levels, absorption band and molecular aggregation of a small molecular donor for high-performance ternary organic solar cells with comprehensively improved photovoltaic parameters.