Regulating the electrode potential offset in perovskite solar cells for boosting interfacial charge transfer

Qiong Wang; Mengfan Xue; Kaijian Zhu; Qiyu Qu; Bo Wang; Shengyao Wang; Bing Wang; Zhigang Zou; Wenjun Luo

doi:10.1039/d5cp04519c

Regulating the electrode potential offset in perovskite solar cells for boosting interfacial charge transfer

Qiong Wang, Mengfan Xue, Kaijian Zhu, Qiyu Qu, Bo Wang, Shengyao Wang^*, Bing Wang, Zhigang Zou, Wenjun Luo^*

^*Corresponding author for this work

School of Energy and Environment

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Abstract

In perovskite solar cells (PSCs), the interfacial charge transfer is adjusted by a band offset to improve the device performance. However, the band offset cannot explain some abnormal phenomena of interfacial charge transfer. In this study, we adjusted the electrode potential offset (ΔEPO) at the perovskite/hole transport layer (HTL) interface by employing different side chain HTLs, which increased the device efficiency from 0.6% to 18.1%. We also investigated the relationship between chemical reaction kinetics at the perovskite/HTL interface and the ΔEPO by in situ FTIR, NMR, theoretical calculations and electrochemical measurements. Accordingly, we proposed ΔEPO as a driving force descriptor for interfacial charge transfer in PSCs for the first time. These results deepen the understanding of the interfacial charge transfer and offer a new design principle for the interface in the PSCs. This journal is © the Owner Societies, 2026

Original language	English
Number of pages	8
Journal	Physical Chemistry Chemical Physics
Volume	28
Issue number	5
Online published	3 Jan 2026
DOIs	https://doi.org/10.1039/d5cp04519c
Publication status	Published - 4 Feb 2026

Funding

This work was supported by the National Natural Science Foundation of China (22425202, 22279052, 22372067, and 22279053), the China Postdoctoral Science Foundation (2023M741613) and the Jiangsu Funding Program for Excellent Postdoctoral Talent (2023ZB067).

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SDG 7 Affordable and Clean Energy

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title = "Regulating the electrode potential offset in perovskite solar cells for boosting interfacial charge transfer",

abstract = "In perovskite solar cells (PSCs), the interfacial charge transfer is adjusted by a band offset to improve the device performance. However, the band offset cannot explain some abnormal phenomena of interfacial charge transfer. In this study, we adjusted the electrode potential offset (ΔEPO) at the perovskite/hole transport layer (HTL) interface by employing different side chain HTLs, which increased the device efficiency from 0.6% to 18.1%. We also investigated the relationship between chemical reaction kinetics at the perovskite/HTL interface and the ΔEPO by in situ FTIR, NMR, theoretical calculations and electrochemical measurements. Accordingly, we proposed ΔEPO as a driving force descriptor for interfacial charge transfer in PSCs for the first time. These results deepen the understanding of the interfacial charge transfer and offer a new design principle for the interface in the PSCs. This journal is {\textcopyright} the Owner Societies, 2026",

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T1 - Regulating the electrode potential offset in perovskite solar cells for boosting interfacial charge transfer

AU - Wang, Qiong

AU - Xue, Mengfan

AU - Zhu, Kaijian

AU - Qu, Qiyu

AU - Wang, Bo

AU - Wang, Shengyao

AU - Wang, Bing

AU - Zou, Zhigang

AU - Luo, Wenjun

PY - 2026/2/4

Y1 - 2026/2/4

N2 - In perovskite solar cells (PSCs), the interfacial charge transfer is adjusted by a band offset to improve the device performance. However, the band offset cannot explain some abnormal phenomena of interfacial charge transfer. In this study, we adjusted the electrode potential offset (ΔEPO) at the perovskite/hole transport layer (HTL) interface by employing different side chain HTLs, which increased the device efficiency from 0.6% to 18.1%. We also investigated the relationship between chemical reaction kinetics at the perovskite/HTL interface and the ΔEPO by in situ FTIR, NMR, theoretical calculations and electrochemical measurements. Accordingly, we proposed ΔEPO as a driving force descriptor for interfacial charge transfer in PSCs for the first time. These results deepen the understanding of the interfacial charge transfer and offer a new design principle for the interface in the PSCs. This journal is © the Owner Societies, 2026

AB - In perovskite solar cells (PSCs), the interfacial charge transfer is adjusted by a band offset to improve the device performance. However, the band offset cannot explain some abnormal phenomena of interfacial charge transfer. In this study, we adjusted the electrode potential offset (ΔEPO) at the perovskite/hole transport layer (HTL) interface by employing different side chain HTLs, which increased the device efficiency from 0.6% to 18.1%. We also investigated the relationship between chemical reaction kinetics at the perovskite/HTL interface and the ΔEPO by in situ FTIR, NMR, theoretical calculations and electrochemical measurements. Accordingly, we proposed ΔEPO as a driving force descriptor for interfacial charge transfer in PSCs for the first time. These results deepen the understanding of the interfacial charge transfer and offer a new design principle for the interface in the PSCs. This journal is © the Owner Societies, 2026

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U2 - 10.1039/d5cp04519c

DO - 10.1039/d5cp04519c

M3 - RGC 21 - Publication in refereed journal

SN - 1463-9076

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JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 5

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Regulating the electrode potential offset in perovskite solar cells for boosting interfacial charge transfer

Abstract

Funding

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