Wen Tian-Jiao, Liu Zhi-Xi, Chen Zeng, Zhou Jiadong, Shen Ziqiu, Xiao Yiqun, Lu Xinhui, Xie Zengqi, Zhu Haiming, Li Chang-Zhi, Chen Hongzheng
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China.
Angew Chem Int Ed Engl. 2021 Jun 1;60(23):12964-12970. doi: 10.1002/anie.202101867. Epub 2021 May 6.
Despite the remarkable progress achieved in recent years, organic photovoltaics (OPVs) still need work to approach the delicate balance between efficiency, stability, and cost. Herein, two fully non-fused electron acceptors, PTB4F and PTB4Cl, are developed via a two-step synthesis from single aromatic units. The introduction of a two-dimensional chain and halogenated terminals for these non-fused acceptors plays a synergistic role in optimizing their solid stacking and orientation, thus promoting an elongated exciton lifetime and fast charge-transfer rate in bulk heterojunction blends. As a result, PTB4Cl, upon blending with PBDB-TF polymer, has enabled single-junction OPVs with power conversion efficiencies of 12.76 %, representing the highest values among the reported fully unfused electron acceptors so far.
尽管近年来取得了显著进展，但有机光伏（OPV）在实现效率、稳定性和成本之间的微妙平衡方面仍需努力。在此，通过从单一芳香单元进行两步合成，开发了两种完全非稠合电子受体PTB4F和PTB4Cl。对于这些非稠合受体，二维链和卤化端基的引入在优化其固体堆积和取向方面发挥了协同作用，从而延长了激子寿命，并提高了本体异质结共混物中的电荷转移速率。结果，PTB4Cl与PBDB-TF聚合物共混后，实现了单结有机光伏电池，功率转换效率达到12.76%，是迄今为止报道的完全非稠合电子受体中的最高值。
