Chlorine-Substituent Regulation in Dopant-Free Small-Molecule Hole-Transport Materials Improves the Efficiency and Stability of Inverted Perovskite Solar Cells

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外文摘要：Although doped hole-transport materials(HTMs)offer an efficiency benefit for perovskite solar cells(PSCs),they inevi-tably diminish the stability.Here,we describe the use of various chlorinated small molecules,specifically fluorenone-triphenylamine(FO-TPA)-x-C1[x=para,meta,and ortho(p,m,and o)],with different chlorine-substituent positions,as dopant-free HTMs for PSCs.These chlorinated molecules feature a symmetrical donor-acceptor-donor structure and ideal intramolecular charge transfer properties,allowing for self-doping and the establishment of built-in potentials for improving charge extraction.Highly efficient hole-transfer interfaces are constructed between perovskites and these HTMs by strategi-cally modifying the chlorine substitution.Thus,the chlorinated HTM-derived inverted PSCs exhibited superior efficiencies and air stabilities.Importantly,the dopant-free HTM FO-TPA-o-Cl not only attains a power conversion efficiency of 20.82％but also demonstrates exceptional stability,retaining 93.8％of its initial efficiency even after a 30-day aging test conducted under ambient air conditions in PSCs without encapsulation.These findings underscore the critical role of chlorine-substituent regulation in HTMs in ensuring the formation and maintenance of efficient and stable PSCs.

外文关键词：

Hole-transport materialsInverted perovskite solar cellsChlorinated small moleculesDonor-acceptor-donor structure

作者：

Xinyi Liu、Xiaoye Zhang、Zhanfeng Li、Jinbo Chen、Yanting Tian、Baoyou Liu、Changfeng Si、Gang Yue、Hua Dong、Zhaoxin Wu

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作者单位：

Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,China

School of Electrical Engineering,University of South China,Hengyang 421001,China

College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030024,China

Ningxia Hui Autonomous Region Screen Display Organic Materials Engineering Technology Research Center,Ningxia Sinostar Display Material Co.,Ltd.,Yinchuan 750003,China

Organic Semiconductor Centre,EaStCHEM School of Chemistry,University of St Andrews,Fife KY16 9ST,UK

Key Laboratory of Photonics Technology for Information School of Electronic and Information Engineering,Xi'an Jiaotong University,Xi'an 710049,China

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出版年：

2024

DOI：

10.1007/s12209-024-00401-5

天津大学学报(英文版)

天津大学

天津大学学报(英文版)

影响因子：0.343

ISSN：1006-4982

年,卷(期)：2024.30(4)