Solvent Engineering for High-Performance Two-Dimensional Ruddlesden-Popper CsPbI<sub>3</sub>Solar Cells

Journal article (2022)

Authors

Haiqiang Chen Lanzhou University

Yutian Lei Lanzhou University

Huanhuan Yao Lanzhou University

Zhizai Li Lanzhou University

Guoqiang Peng Lanzhou University

Xufeng Zhou Liaocheng University

H. Wang Photovoltaic Materials and Devices -

Qian Wang Lanzhou University

Zhiwen Jin Lanzhou University

Research Group

Photovoltaic Materials and Devices () (TU Delft)

DOI

https://doi.org/10.1021/acsaem.2c02345

Solvent engineering 2D inorganic perovskites Crystallization kinetics Intermediate phase Ruddlesden-Popper phase

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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

Two-dimensional (2D) Ruddlesden-Popper (RP) CsPbI3 exhibits enhanced phase stability compared with 3D CsPbI3. However, the issue of the uncontrollable crystallization process limits its photovoltaic performance. Here, the influence of a binary mixed solvent on the film quality and photovoltaic properties of (PEA)2Cs4Pb5I16 (n = 5) is studied in detail. It is demonstrated that the crystallization rate and crystal growth can be controlled by adjusting the amount of dimethyl sulfoxide (DMSO). Optimizing the solvent composition with adding 10% DMSO in pure dimethyl formamide (DMF) leads to perfect coverage, larger flaky 2D grains, reduced grain boundaries, and a better vertical orientation to the substrate due to the formation of a more stable intermediate phase. This can form good interface contact, which is beneficial to charge transport/extraction between TiO2 (electron transport layer, ETL) and perovskite, finally resulting in improved device performance. The enhancement of the power conversion efficiency of the optimized device based on DMF/DMSO (9:1) is 3.57% compared with the reference device based on pure DMF. This work illustrates the role of crystallization kinetics in the RP CsPbI3 film and offers a simple and effective method for high-performance 2D CsPbI3 solar cells.

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