Less-acidic boric acid-functionalized self-assembled monolayer for mitigating NiOx corrosion for efficient all-perovskite tandem solar cells

Jingnan Wang, Boxin Jiao, Ruijia Tian, Kexuan Sun, Yuanyuan Meng, Yang Bai, Xiaoyi Lu, Bin Han, Ming Yang, Yaohua Wang, Shujing Zhou, Haibin Pan, Zhenhuan Song, Chuanxiao Xiao, Chang Liu () and Ziyi Ge ()
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Jingnan Wang: Chinese Academy of Sciences
Boxin Jiao: Tsinghua University
Ruijia Tian: Chinese Academy of Sciences
Kexuan Sun: Chinese Academy of Sciences
Yuanyuan Meng: Chinese Academy of Sciences
Yang Bai: Chinese Academy of Sciences
Xiaoyi Lu: Chinese Academy of Sciences
Bin Han: Chinese Academy of Sciences
Ming Yang: Chinese Academy of Sciences
Yaohua Wang: Chinese Academy of Sciences
Shujing Zhou: Chinese Academy of Sciences
Haibin Pan: Chinese Academy of Sciences
Zhenhuan Song: Chinese Academy of Sciences
Chuanxiao Xiao: Chinese Academy of Sciences
Chang Liu: Chinese Academy of Sciences
Ziyi Ge: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-14

Abstract: Abstract The interfacial contact between NiOx and self-assembled monolayers (SAMs) in wide-bandgap (WBG) subcells limits the efficiency and stability of all-perovskite tandem solar cells (TSCs). The strongly acidic phosphoric acid (PA) anchors in common PA-SAMs corrode reactive NiOx, undermining device stability. Moreover, SAM aggregation leads to interfacial losses and significant open-circuit voltage (VOC) deficits. Here, we introduce boric acid (BA) as a milder anchoring group that chemisorbs onto NiOx via strong – $${{\rm{BO}}}_2{\mbox{-}}$$ BO 2 - –Ni coordination. A benzothiophene-fused head group enhances interfacial bonding through S–Ni orbital interactions, yielding higher binding energy than PA-SAMs. This design also promotes homogeneous SAM formation without aggregation. Resultantly, the WBG cell exhibits an improved PCE to 20.1%. When integrated with narrow bandgap (NBG) subcell, the two-terminal (2T) TSCs achieve an ameliorative PCE of 28.5% and maintain 90% of the initial PCE after maximum power point tracking (MPP) under 1 sun illumination for 500 h.

Date: 2025
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DOI: 10.1038/s41467-025-59515-6

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