Self-assembled hole-selective contact for efficient Sn-Pb perovskite solar cells and all-perovskite tandems

Jingwei Zhu, Xiaozhen Huang, Yi Luo, Wenbo Jiao, Yuliang Xu, Juncheng Wang, Zhiyu Gao, Kun Wei, Tianshu Ma, Jiayu You, Jialun Jin, Shenghan Wu, Zhihao Zhang, Wenqing Liang, Yang Wang (), Shengqiang Ren, Changlei Wang, Cong Chen (), Jinbao Zhang () and Dewei Zhao ()
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Jingwei Zhu: Sichuan University
Xiaozhen Huang: Fujian Normal University and Strait Laboratory of Flexible Electronics (SLoFE)
Yi Luo: Sichuan University
Wenbo Jiao: Sichuan University
Yuliang Xu: Sichuan University
Juncheng Wang: Sichuan University
Zhiyu Gao: Sichuan University
Kun Wei: Xiamen University
Tianshu Ma: Soochow University
Jiayu You: Sichuan University
Jialun Jin: Sichuan University
Shenghan Wu: Sichuan University
Zhihao Zhang: Sichuan University
Wenqing Liang: Sichuan University
Yang Wang: Fujian Normal University and Strait Laboratory of Flexible Electronics (SLoFE)
Shengqiang Ren: Sichuan University
Changlei Wang: Soochow University
Cong Chen: Sichuan University
Jinbao Zhang: Xiamen University
Dewei Zhao: Sichuan University

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

Abstract: Abstract Self-assembled monolayers (SAMs) have displayed unpredictable potential in efficient perovskite solar cells (PSCs). Yet most of SAMs are largely suitable for pure Pb-based devices, precisely developing promising hole-selective contacts (HSCs) for Sn-based PSCs and exploring the underlying general mechanism are fundamentally desired. Here, based on the prototypical donor-acceptor SAM MPA-BT-BA (BT), oligoether side chains with different length (i.e., methoxy, 2-methoxyethoxy, 2-(2-methoxyethoxy)ethoxy group) were custom-introduced on the benzothiadiazole unit to produce the target SAMs with acronyms MPA-MBT-BA (MBT), MPA-EBT-BA (EBT), and MPA-MEBT-BA (MEBT), respectively, and acting as HSCs for efficient Sn-Pb PSCs and all-perovskite tandems. The introduction of oligoether side chains enables HSCs effectively accelerate hole extraction, regulate the crystal growth and passivate surface defects of Sn-Pb perovskites. In particular, benefiting from the enhanced Sn-Pb perovskite film quality and the suppressed interfacial non-radiative recombination losses, EBT-tailored LBG devices yield a champion efficiency of 23.54%, enabling 28.61% efficient monolithic all-perovskite tandems with an impressive VOC of 2.155 V and excellent operational stability as well as 28.22%-efficiency 4-T tandems.

Date: 2025
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DOI: 10.1038/s41467-024-55492-4

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