The Importance of End Groups for Solution-Processed Small-Molecule Bulk-Heterojunction Photovoltaic Cells
作者:Ruomeng Duan、Yong Cui、Yanfei Zhao、Chen Li、Long Chen、Jianhui Hou、Manfred Wagner、Martin Baumgarten、Chang He、Klaus Müllen
DOI:10.1002/cssc.201501626
日期:2016.5.10
End groups in small‐molecule photovoltaic materials are important owing to their strong influence on molecular stability, solubility, energy levels, and aggregation behaviors. In this work, a series of donor–acceptor pentads (D2–A–D1–A–D2) were designed and synthesized, aiming to investigate the effect of the end groups on the materials properties and photovoltaic device performance. These molecules
小分子光伏材料中的端基非常重要,因为它们对分子稳定性,溶解度,能级和聚集行为有很大的影响。在这项工作中,设计并合成了一系列供体-受体五单元组(D 2 –A–D 1 –A–D 2),旨在研究端基对材料性能和光伏器件性能的影响。这些分子共享相同中央A-d 1个-A三单元组(与苯并二噻吩为d 1和6-羰基-噻吩并[3,4- b ]噻吩,A),但具有不同的d 2组成的端基烷基取代的噻吩( T),thieno [3,2‐ b]噻吩(TT)和2,2'-联噻吩(BT)。结果表明端基的共轭链段/烷基链长与光伏性能之间的关系,这有助于发展高效有机太阳能电池的分子设计原理。