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Surface passivation with multifunctional molecules is a powerful approach to enhancing the performance and stability of perovskite solar cells (PSCs). This study reports the fabrication of wide-bandgap tin-based perovskite solar cells (WB-Sn-PSCs) with a bandgap of 1.68 eV, achieving a power conversion efficiency of 11.14%. Molecular surface passivation using 4-Fluorobenzohydrazide (F-BHZ) significantly improves device performance and stability by engineering both the surface and bulk properties of the WB-Sn-HP film. F-BHZ treatment strengthens electrostatic potential and molecular interactions with functional groups, mitigating surface defects and suppressing Sn2⁺ oxidation, as confirmed by theoretical calculations. This work highlights the potential of advanced chemical engineering strategies to optimize non-toxic, lead-free perovskite solar cells, advancing their competitiveness as environmentally friendly photovoltaic solutions.

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  © 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keyword: Perovskite Solar Cells, Sn-perovskite, Surface Passivation, Wide Band Gap Perovskite

Date published: 2025-06-08

Publisher: IEEE

Journal:

• Conference Record of the IEEE Photovoltaic Specialists Conference (ISSN: 01608371) vol. 1 p. 680-682

Funding:

• Hitachi

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6224

First published URL: https://doi.org/10.1109/pvsc59419.2025.11133091

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Updated at: 2026-03-19 14:27:08 +0900

Published on MDR: 2026-03-19 13:36:20 +0900