Lin Hao-Sheng, Doba Takahiro, Sato Wataru, Matsuo Yutaka, Shang Rui, Nakamura Eiichi
Department of Chemical System Engineering, Nagoya University, Nagoya, 464-8603, Japan.
Department of Mechanical Engineering, The University of Tokyo, Tokyo, 113-8656, Japan.
Angew Chem Int Ed Engl. 2022 Jul 4;61(27):e202203949. doi: 10.1002/anie.202203949. Epub 2022 May 11.
Polytriarylamine is a popular hole-transporting materials (HTMs) despite its suboptimal conductivity and significant recombination at the interface in a solar cell setup. Having noted insufficient conjugation among the triarylamine units along the polymer backbone, we inserted a bithiophene unit between two triarylamine units through iron-catalyzed C-H/C-H coupling of a triarylamine/thiophene monomer so that two units conjugate effectively via four quinoidal rings when the molecule functions as HTM. The obtained triarylamine/bithiophene copolymer (TABT) used as HTM showed a high-performance in methylammonium lead iodide perovskite (MAPbI ) solar cells. Mesityl substituted TABT forms a uniform film, shows high hole-carrier mobility, and has an ionization potential (IP=5.40 eV) matching that of MAPbI . We fabricated a solar cell device with a power conversion efficiency of 21.3 % and an open-circuit voltage of 1.15 V, which exceeds the performance of devices using reference standard such as poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA) and Spiro-OMeTAD.
聚三芳基胺是一种常用的空穴传输材料（HTMs），尽管其导电性欠佳，且在太阳能电池装置中的界面处存在显著的复合现象。鉴于聚合物主链上三芳基胺单元之间的共轭不足，我们通过三芳基胺/噻吩单体的铁催化C-H/C-H偶联，在两个三芳基胺单元之间插入了一个联噻吩单元，使得该分子作为HTM发挥作用时，两个单元能够通过四个醌式环有效地共轭。用作HTM的所得三芳基胺/联噻吩共聚物（TABT）在甲基铵碘化铅（MAPbI₃）太阳能电池中表现出高性能。均三甲苯基取代的TABT形成均匀薄膜，具有高空穴载流子迁移率，且其电离势（IP = 5.40 eV）与MAPbI₃相匹配。我们制备了一种功率转换效率为21.3%、开路电压为1.15 V的太阳能电池器件，其性能超过了使用诸如聚[双（4-苯基）（2,4,6-三甲基苯基）胺（PTAA）和Spiro-OMeTAD等参考标准的器件。
