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Treating CsPbI₃ Perovskite with Pyrrolidinium Iodide to Improve the Performance of Perovskite Solar Cells

by Qixian Zhang^#, Yi Guo^#, Huicong Liu, Weiping Li, Liqun Zhu, Haining Chen^*

School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

* Corresponding Author: Haining Chen. Email:
# These authors contributed equally

(This article belongs to the Special Issue: Perovskite Solar Cells)

Journal of Renewable Materials 2023, 11(8), 3193-3201. https://doi.org/10.32604/jrm.2023.027730

Received 12 November 2022; Accepted 05 December 2022; Issue published 26 June 2023

Abstract

All-inorganic CsPbI₃ perovskite has attracted wide attention due to its desirable optical bandgap (E_g: ∼1.7 eV) as well as high chemical stability. Nevertheless, the photovoltaic performance of CsPbI₃ perovskite solar cells (PSCs) was limited by severe nonradiative charge recombination due to high defect density at the grain boundary and surface of perovskite films. To address this issue, a pyrrolidinium iodide (PyI) molecule was introduced to modify the surface and grain boundary of CsPbI₃ perovskite films to passivate defects, which improves the quality of CsPbI₃ perovskite films as well as induces the generation of a quasi-2D Py₂CsPb₂I₇ capping layer between perovskite layer and hole transport layer. Such quasi-2D Py₂CsPb₂I₇ capping layer optimizes interface contact between CsPbI₃ perovskite layer and hole transport layer and blocks the electron transfer from CsPbI₃ perovskite photoactive layer to the hole transport layer. As a result, the performance of CsPbI₃ PSCs is well improved to 17.87% for power conversion efficiency (PCE) with an ultra-high fill factor (FF) of 0.84. In addition, the PyI molecule modified CsPbI₃ perovskite devices exhibit excellent stability, which remains its initial PCE almost unchanged after aging for 35 days under the dry air atmosphere (temperature: 20°C–30°C, control relative humidity (RH): <10%).

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Supplementary Material

Supplementary Material File

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