Suppressing faradaic reaction induced surface nonradiative recombination on a perovskite to improve its photovoltaic performance.

Authors

Qiong Wang, Qiyu Qu, Ruotong Bao, Zhenhui Liu, Lianghe Hu, Zhaoke Zheng, Bing Wang, Chengzhang Wan, Dongjian Jiang, Zhigang Zou, Wenjun Luo

Published in

Physical chemistry chemical physics : PCCP. Sep 28, 2026. Epub Sep 28, 2026.

Abstract

Surface nonradiative recombination in perovskites, which deteriorates the performance of perovskite solar cells (PSCs), is usually ascribed to perovskite surface defects and interface energy level mismatch. In this study, by combining in situ X-ray photoelectron spectroscopy (XPS), electrochemical methods and photoluminescence (PL) spectroscopy, we find that surface nonradiative recombination is induced by faradaic reactions between Pb²⁺/Pb^2-x and I^-/I^-1+x on the FAPbI₃ surface under illumination. Depositing Tm(NO₃)₃ on the FAPbI₃ surface suppresses the Pb²⁺ + xe^- ↔ Pb^2-x faradaic reaction, thereby decreasing the surface nonradiative recombination and boosting the power conversion efficiency of an FAPbI₃ solar cell from 20.29% to 23.15%. The finding offers new understanding of surface nonradiative recombination in perovskites, which is helpful for designing and constructing high-performance perovskite photovoltaics.

PMID:
42803558
Bibliographic data and abstract were imported from PubMed on 28 Sep 2026.

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