Sulfur vs. tellurium: the heteroatom effects on the nonfullerene acceptors
Sulfur vs. tellurium: the heteroatom effects on the nonfullerene acceptors
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硫与碲：杂原子对非富勒烯受体的影响
DOI：
10.1007/s11426-019-9462-4
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发表时间：
2019-03
期刊：
影响因子：
--
通讯作者：
Huang Hui
中科院分区：
文献类型：
--
作者：
Yang Lei;Qin Linqing;Xu Yunxiao;Zhang Huotian;Lv Lei;Chen Kepeng;Sui Xinyu;Zhong Yangguang;Guo Yuan;Gao Feng;Zhao Jianzhang;Li Yuhao;Liu Xinfeng;Yi Yuanping;Lu Xinhui;Peng Aidong;Huang Hui
系统地研究了硫杂原子变化对给体材料的影响。然而，这种对受体的影响很少被探索。本文通过简单地将硫原子从S变为Te，报道了非富勒烯受体bfpspandbfptpp2。系统地研究了bfpsppan和bfptpin的光吸收、能级、激发态寿命、能量损失、电荷迁移率、形态和光伏性能的差异，以了解杂原子效应。更重要的是，电致发光光谱、光伏的外量子效率和TD-DFT计算表明，bfptpex的能量中的三态激发态（T1）与PBDB-T:BFPTP中的电荷转移态（CT）相当，这使得系统间交叉产生的T1激子分裂成自由电荷，从而有助于提高效率。这一贡献为调整非富勒烯受体的光物理性质和设计高性能的OSCs三重态材料提供了策略。
The effect of chalcogen heteroatom variation on donor materials has been systematically investigated. However, this effect on acceptors has rarely been explored. Herein, nonfullerene acceptorsBFPSPandBFPTPwere reported by simply changing the chalcogen atoms from S to Te. The differences betweenBFPSPandBFPTPin light absorption, energy levels, excited-state lifetimes, energy loss, charge mobilities, morphology, and photovoltaic properties were systematically investigated to understand the heteroatom effects. More importantly, the electroluminescence spectra, external quantum efficiency of photovoltaics and TD-DFT calculations revealed that the triplet excited state (T1) in energy ofBFPTPequals to the charge transfer (CT) state in PBDB-T:BFPTP, which allows T1excitons, generated by intersystem crossing, to split into free charges to contribute to the efficiency. This contribution provides a strategy for tuning the photophysical properties of nonfullerene acceptors and designing high performance triplet materials for OSCs.
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