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Surface passivation with multifunctional molecules is an effective strategy to mitigate the defect and improve the performance and stability of perovskite solar cells (PSCs). Here, the fabrication of a wide bandgap-PSC is reported with tin perovskite (WB-Sn-HP; bandgap: 1.68 eV), followed by molecular surface passivation using 4-Fluoro-benzohydrazide (F-BHZ). WB-Sn-PSC has demonstrated a promising device efficiency of 11.14% with improved device stability. The key to enhancing device performance lies in the meticulous engineering of both surface and bulk properties of WB-Sn-HP film with F-BHZ treatment due to stronger electrostatic potential and molecular interaction with hydrazine and carbonyl functionalities. A compact perovskite film and highly crystalline film growth results in a longer carrier lifetime and surface defect mitigation with the control of Sn2+ oxidation as supported by theoretical calculations. This work underlines the promising potential of chemical engineering to improve the device performance of WB-Sn-PSC and stability using multifunctional passivating molecules.

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  This is the peer reviewed version of the following article: D. B. Khadka, Y. Shirai, R. Sahara, M. Yanagida, K. Miyano, Ameliorating Defects in Wide Bandgap Tin Perovskite Solar Cells Using Fluorinated Solvent and Hydrazide. Small 2024, 2410048, which has been published in final form at https://doi.org/10.1002/smll.202410048. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

Keyword: Wide bandgap tin perovskite, Lead-free, Tin oxidation, Device stability, Surface passivation, Pb-free Tandem device

Date published: 2024-12-15

Publisher: Wiley

Journal:

• Small (ISSN: 16136810)

Funding:

• Japan Society for the Promotion of Science 24K01149
• National Institute for Materials Science
• Kurata Memorial Hitachi Science and Technology Foundation 1572

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5181

First published URL: https://doi.org/10.1002/smll.202410048

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Updated at: 2025-12-19 08:31:22 +0900

Published on MDR: 2025-12-18 19:08:24 +0900