2D Dion–Jacobson CsPbI<sub>3</sub> with Enhanced Interlayer Coupling for Stable and Efficient Photovoltaics

Journal article (2022)

Authors

Yutian Lei Lanzhou University
Guoqiang Peng Lanzhou University
H. Wang Photovoltaic Materials and Devices - EEMCS
Gang Wang Ningbo University
Siwei Yang Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences
Qian Wang Lanzhou University, School of Physical Science and Technology
Zhen Hua Li Lanzhou University
Zhiwen Jin Lanzhou University
Research Group
Photovoltaic Materials and Devices (EEMCS) (TU Delft)
Copyright: © 2022 Yutian Lei, Guoqiang Peng, H. Wang, Gang Wang, Siwei Yang, Qian Wang, Zhen Hua Li, Zhiwen Jin
DOI
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https://doi.org/10.1002/admi.202201501
2D inorganic perovskite Dion–Jacobson Efficiency and stability Layer coupling Ruddlesden–Popper
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Published Date

2022

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

Photovoltaic Materials and Devices

Abstract

Inorganic 2D layered CsPbI3 is awaiting to overcome the phase instability of traditional 3D components. However, the most reported Ruddlesden–Popper (RP) phase 2D CsPbI3 leads to larger interlayer distance and weaker interlayer coupling since the existence of the van der Waals gap, which deteriorates the performance of the device and makes the improvement of stability unsatisfactory. Herein, this work resorts ethylenediamine cations (EDA2+) to construct a series of Dion–Jacobson (DJ) phase 2D CsPbI3 as (EDA)Csn−1PbnI3n+1 with van der Waals gap eliminated. Combining simulation calculations and experiments, it is found that the (EDA)Csn−1PbnI3n+1 has enhanced intermolecular forces to overcome the problem of insufficient crystallization power caused by large steric hindrance in the film assembly process compared to phenethylammonium-based RP phase analogues. In addition, profit from the reduced interlayer distance and stronger coupling, the rigidity of the structure is increased, and the annoying non-radiative recombination caused by structural fluctuations is alleviated. As a result, the 2D layered DJ phase CsPbI3-based solar cells deliver eminent performance than RP phase analogues, especially the 2D (EDA)(Cs)4Pb5I16 (n = 5) device exhibits a record PCE of 10.43% in this work, and significantly enhanced stability.