Molecular ferroelectric self-assembled interlayer for efficient perovskite solar cells

Chang Xu, Pengjie Hang, Chenxia Kan, Xiangwei Guo, Xianjiang Song, Chenran Xu, Guofeng You, Wei-Qiang Liao, Haiming Zhu, Dawei Wang, Qi Chen (), Zijian Hong (), Ren-Gen Xiong (), Xuegong Yu (), Lijian Zuo () and Hongzheng Chen ()
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Chang Xu: Zhejiang University
Pengjie Hang: Zhejiang University
Chenxia Kan: Zhejiang University
Xiangwei Guo: Zhejiang University
Xianjiang Song: Nanchang University
Chenran Xu: Zhejiang University
Guofeng You: Zhejiang University
Wei-Qiang Liao: Nanchang University
Haiming Zhu: Zhejiang University
Dawei Wang: Zhejiang University
Qi Chen: Chinese Academy of Sciences
Zijian Hong: Zhejiang University
Ren-Gen Xiong: Nanchang University
Xuegong Yu: Zhejiang University
Lijian Zuo: Zhejiang University
Hongzheng Chen: Zhejiang University

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract The interfacial molecular dipole enhances the photovoltaic performance of perovskite solar cells (PSCs) by facilitating improved charge extraction. However, conventional self-assembled monolayers (SAMs) face challenges like inadequate interface coverage and weak dipole interactions. Herein, we develop a strategy using a self-assembled ferroelectric layer to modify the interfacial properties of PSCs. Specifically, we employ 1-adamantanamine hydroiodide (ADAI) to establish robust chemical interactions and create a dipole layer over the perovskite. The oriented molecular packing and spontaneous polarity of ferroelectric ADAI generate a substantial interfacial dipole, adjusting band bending at the anode, reducing band misalignment, and suppressing charge recombination. Consequently, our formamidinium lead iodide-based conventional PSC achieves efficiencies of 25.13% (0.06 cm2) and 23.5% (1.00 cm2) while exhibiting enhanced stability. Notably, we demonstrate an impressive efficiency of 25.59% (certified at 25.36%) in a 0.06 cm2 area for the inverted champion device, showcasing the promise of ferroelectric SAMs for PSCs performance enhancement.

Date: 2025
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DOI: 10.1038/s41467-025-56182-5

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