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Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells
Author(s) -
Ma Ke,
Atapattu Harindi R.,
Zhao Qiuchen,
Gao Yao,
Finkenauer Blake P.,
Wang Kang,
Chen Ke,
Park So Min,
Coffey Aidan H.,
Zhu Chenhui,
Huang Libai,
Graham Kenneth R.,
Mei Jianguo,
Dou Letian
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100791
Subject(s) - passivation , materials science , perovskite (structure) , energy conversion efficiency , halide , cationic polymerization , tandem , band gap , optoelectronics , chemical engineering , nanotechnology , layer (electronics) , inorganic chemistry , polymer chemistry , composite material , chemistry , engineering
Surface passivation is an effective way to boost the efficiency and stability of perovskite solar cells (PSCs). However, a key challenge faced by most of the passivation strategies is reducing the interface charge recombination without imposing energy barriers to charge extraction. Here, a novel multifunctional semiconducting organic ammonium cationic interface modifier inserted between the light‐harvesting perovskite film and the hole‐transporting layer is reported. It is shown that the conjugated cations can directly extract holes from perovskite efficiently, and simultaneously reduce interface non‐radiative recombination. Together with improved energy level alignment and the stabilized interface in the device, a triple‐cation mixed‐halide medium‐bandgap PSC with an excellent power conversion efficiency of 22.06% (improved from 19.94%) and suppressed ion migration and halide phase segregation, which lead to a long‐term operational stability, is demonstrated. This strategy provides a new practical method of interface engineering in PSCs toward improved efficiency and stability.