Synergistic engineering of buried interfaces for high-efficiency and stable perovskite solar cells

Abstract

To address the challenges of interfacial defects and energy-level alignment in perovskite solar cells (PSCs), this study introduces p-toluenethiol as a molecular modifier for the SnO2/perovskite buried interface. The thiol groups (–SH) coordinate with oxygen vacancies and hydroxyl groups on the SnO2 surface, effectively passivating deep-level trap states and suppressing the formation of PbI2 secondary phases and lattice defects. The aromatic benzene ring induces interfacial dipole moments via π-conjugation, optimizing energy-level alignment between SnO2 and perovskite to reduce electron transport barriers, and its hydrophobicity also enhances the device's environmental stability. Experimental results show that PSCs achieve a power conversion efficiency (PCE) of 25.53%, while flexible devices exhibit a PCE of 23.27%. Stability tests demonstrate significantly improved performance retention under continuous illumination and environmental exposure. This work synergistically optimizes device efficiency and stability through molecular-scale inter facial engineering, providing a foundation for the application of perovskite solar cells.

Graphical abstract: Synergistic engineering of buried interfaces for high-efficiency and stable perovskite solar cells

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Article information

Article type
Paper
Submitted
12 Май 2025
Accepted
07 Июль 2025
First published
14 Июль 2025

J. Mater. Chem. A, 2025, Advance Article

Synergistic engineering of buried interfaces for high-efficiency and stable perovskite solar cells

Y. Hua, X. Song, L. Zhao, C. Wu, J. Zhang, W. Chen and L. Song, J. Mater. Chem. A, 2025, Advance Article , DOI: 10.1039/D5TA03804A

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