Issue 25, 2023

Molecule stapling-assisted fabrication of high-quality CsPbI2Br films for efficient and stable photovoltaic modules

Abstract

CsPbI2Br perovskite films have a suitable band gap for the fabrication of tandem solar cells and excellent thermal stability. However, their halide phase separation and water instability lead to challenges for the practical industrialization of CsPbI2Br perovskite solar cells (PSCs). Here, a molecule stapling strategy is demonstrated to assist the fabrication/stabilization of a high-quality large-area CsPbI2Br film by using a series of cesium perfluorodioate salts. According to density functional theory and experimental attempts, hexafluoroglutarate anions possessed a stronger interaction between chelated oxygen and surface Pb2+ ions due to the matchable stapling configuration, which effectively improved moisture tolerance, reduced defects and further improved the phase stability of the CsPbI2Br films. In the prepared high-quality CsPbI2Br films, the fabricated PSCs achieved 16.4% efficiency in a small area. The devices displayed high stability, retaining 92.9% of their initial efficiency for more than 400 h under 85 °C and N2 conditions and 91% of their initial efficiency for 300 h at a relative humidity of 30% without encapsulation. More importantly, this developed strategy can be employed for the production of large-area perovskite solar modules. A mini perovskite solar module with an efficiency up to 12.35% in a large area of 16 cm2 was successfully fabricated.

Graphical abstract: Molecule stapling-assisted fabrication of high-quality CsPbI2Br films for efficient and stable photovoltaic modules

  • This article is part of the themed collection: #MyFirstJMCA

Supplementary files

Article information

Article type
Paper
Submitted
24 Feb 2023
Accepted
06 Apr 2023
First published
06 Apr 2023

J. Mater. Chem. A, 2023,11, 13371-13377

Molecule stapling-assisted fabrication of high-quality CsPbI2Br films for efficient and stable photovoltaic modules

R. Chen, J. Du, X. Zheng, Y. Yang, L. Yuan, Y. Yang, F. Li and H. Wang, J. Mater. Chem. A, 2023, 11, 13371 DOI: 10.1039/D3TA01168B

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