A Facile Synthesized Polymer Featuring B‐N Covalent Bond and Small Singlet‐Triplet Gap for High‐Performance Organic Solar Cells
作者:Shuting Pang、Zhiqiang Wang、Xiyue Yuan、Langheng Pan、Wanyuan Deng、Haoran Tang、Hongbin Wu、Shanshan Chen、Chunhui Duan、Fei Huang、Yong Cao
DOI:10.1002/anie.202016265
日期:2021.4.12
OSC, comparable to the benzo[1,2‐b:4,5‐b′]dithiophene (BDT)‐based counterpart. The nonradiative recombination energy loss of 0.19 eV was afforded by PBNT‐BDD. PBNT‐BDD also exhibited weak crystallinity and appropriate miscibility with Y6‐BO, benefitting of morphological stability. The singlet–triplet gap (ΔEST) of PBNT‐BDD is as low as 0.15 eV, which is much lower than those of common organic semiconductors
高效有机太阳能电池(OSC)很大程度上依赖于聚合物供体。在本文中,我们报告了一种新的构建基BNT和具有B-N共价键的相关聚合物PBNT-BDD,可用于OSC。BNT单元仅需3个步骤即可合成,因此可以轻松实现PBNT-BDD的合成。与非富勒烯受体Y6-BO混合时,PBNT-BDD在OSC中的功率转换效率(PCE)为16.1%,与苯并[1,2-b:4,5-b']二噻吩(BDT)相当基于对应项。PBNT-BDD提供的非辐射重组能量损失为0.19 eV。PBNT-BDD还表现出弱结晶性,并与Y6-BO具有适当的混溶性,这有利于形态稳定性。单重态-三重态间隙(ΔE STPBNT-BDD的)低至0.15 eV,远低于常见的有机半导体(≥0.6eV)。结果,PBNT-BDD的三重态高于电荷转移(CT)状态,这将有效地抑制通过三重态的重组。