首页|Brominated PEAI as Multi-Functional Passivator for High-Efficiency Perovskite Solar Cell

Brominated PEAI as Multi-Functional Passivator for High-Efficiency Perovskite Solar Cell

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The interfaces of perovskite solar cells(PSCs)are well known to be rich in deep-level carrier traps,which serve as non-radiative recombination centers and limit the open-circuit voltage(Voc)and power conversion efficiency(PCE)of PSCs.Defect chemistry and surface passivators have been researched extensively and mainly focused on the neutralization of uncoordinated lead or anion defects.Herein,a novel brominated passivator 2-bromophenethylammonium iodide(2-Br-PEAI)is introduced for a multi-functional passivation effect at the perovskite interface.The brominated species readily form 2D perovskite on top of the 3D perovskite and multi-interact with the 3D perovskite surface.Apart from the halide vacancy filling and anion bonding ability,the Br atoms on the benzene ring can interact with the FA cations via strong hydrogen bonding N-H … Br and interact with the[Pbl6]4-inorganic framework.The interface defects in the PSCs are well passivated,minimizing non-radiative recombination and enhancing device performance.As a result,a champion PCE of 24.22％was achieved with high Voc and fill factor.In addition,modified devices also showed enhanced operational stability(retention of＞95％initial PCE after 400 h)and humidity resistance(＞90％initial PCE maintained after 1500 h under～50％RH).

brominated PEAIhigh efficiencyperovskite solar cellsurface passivation

Minghao Li、Junjie Zhou、Liguo Tan、Yue Liu、Siyang Wang、Chaofan Jiang、Hang Li、Xing Zhao、Xingyu Gao、Wolfgang Tress、Liming Ding、Chenyi Yi

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State Key Laboratory of Power System,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China

Shanghai Synchrotron Radiation Facility(SSRF),Shanghai Advanced Research Institute,Chinese Academy of Science,Shanghai 201800,China

Institute of Computational Physics,Zurich University of Applied Sciences,Winterthur 8401,Switzerland

Center of Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China

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国家自然科学基金State Key Laboratory of Power System and Generation EquipmentState Key Laboratory of Power System and Generation Equipment中国博士后科学基金Young Talents Thousand Program

21872080SKLD21Z03SKLD20M03043240004

2023

10.1002/eem2.12360

能源与环境材料(英文)

能源与环境材料(英文)

CSCD
ISSN：
年,卷(期)：2023.6(3)
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