Self-cleaning Spiro-OMeTAD via multimetal doping for perovskite photovoltaics
Sisi Wang,
Shaochen Zhang,
Xiaohuo Shi,
Canglang Yao,
Donger Jin,
Danyu Gu,
Yinjuan Chen,
Jiazhe Xu,
Jingjing Xue and
Rui Wang ()
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Sisi Wang: Westlake University
Shaochen Zhang: Westlake University
Xiaohuo Shi: Westlake University
Canglang Yao: Fudan University
Donger Jin: Zhejiang University
Danyu Gu: Westlake University
Yinjuan Chen: Westlake University
Jiazhe Xu: Westlake University
Jingjing Xue: Zhejiang University
Rui Wang: Westlake University
Nature Communications, 2025, vol. 16, issue 1, 1-10
Abstract:
Abstract Record power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) are usually achieved using organic spiro-OMeTAD. However, conventional doping with hygroscopic dopants (LiTFSI and tBP) leads to compromised device stability. We introduce a synergistic mixed doping strategy that utilizes a combination of metal-TFSI dopants—LiTFSI, KTFSI, NaTFSI, Ca(TFSI)2, and Mg(TFSI)2—to enhance doping efficiency while effectively removing hygroscopic contaminants from the Spiro-OMeTAD solution. This approach achieves PCEs exceeding 25% and significantly improves stability under harsh environmental conditions. Notably, Ca(TFSI)2 and Mg(TFSI)2 facilitate enhanced oxidative doping, while NaTFSI promotes interstitial doping in the bulk perovskite. Additionally, KTFSI serves as a catalytic agent, lowering the reaction energy barrier for the other dopants, thereby accelerating spiro-OMeTAD ion radical production. These findings underscore the potential of synergistic doping in optimizing the performance and longevity of photovoltaic devices.
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59350-9
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DOI: 10.1038/s41467-025-59350-9
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