Unravelling the chloride dopant induced film improvement in all-inorganic perovskite absorber

Nicholson, Stefan and Bruckbauer, Jochen and Edwards, Paul and Trager-Cowan, Carol and Martin, Robert and Ivaturi, Aruna (2024) Unravelling the chloride dopant induced film improvement in all-inorganic perovskite absorber. Journal of Materials Chemistry. A. ISSN 2050-7488 (https://doi.org/10.1039/D4TA01259C)

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Abstract

CsPbI2Br perovskite material has been the focus of much recent research, thanks to its improved stability over CsPbI3, useful bandgap of 1.9 eV and enhanced thermal stability over hybrid perovskite materials with volatile organic components. It has great potential for both single junction solar cells for indoor applications, and implementation in tandem cells. However, moisture stability has remained an issue. In order to overcome this roadblock towards commercialisation, metal chloride dopants have been widely investigated to improve film quality and reduce damage from humidity. The majority of the research to date on this topic has focussed on device performance and bulk film characteristics, with limited attention paid to grain-level crystallinity and whether the dopant is proportionally incorporated into the film. In the present work, cathodoluminescence (CL) and electron backscatter diffraction (EBSD) are utilised to investigate the effects of a lead chloride dopant, both on emission and crystal structure at a grain level, with the findings supported by X-ray diffraction (XRD). Confirmation of proportional incorporation of the dopant into the final prepared films is provided by wavelength dispersive X-ray (WDX) spectroscopy. This work provides a valuable insight into the impact dopants have on all-inorganic perovskite absorbers, helping to influence future dopant design.

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