Self-assembly construction of a homojunction of Sn-Pb perovskite using an antioxidant for all-perovskite tandem solar cells with improved efficiency and stability

Lin Z, Chen J, Duan C, Fan K, Li J, Zou S, Zou F, Yuan L, Zhang Z, Zhang K, Lam MY, Aleksandr SA, Qiu J, Wong KS, Yan H, Yan K (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Energy and Environmental Science Royal Society of Chemistry

Book Volume: 17

Pages Range: 6314-6322

Journal Issue: 17

DOI: 10.1039/d4ee01539h

Abstract

All-perovskite tandem solar cells (PTSCs) demonstrate higher power conversion efficiency (PCE) and lower levelized cost of electricity than single-junction perovskite solar cells (PSCs). However, narrow bandgap (NBG) sub-cells with a Sn-Pb alloy cause severe p-type self-doping by surface oxidized Sn4+ to generate substantial energy loss and device degradation. Here, we developed a one-step self-assembly strategy to construct a p/p− homojunction of Sn-Pb perovskite using the antioxidant 4-trifluoromethylphenylhydrazine hydrochloride (TFPHCl) and prepared highly efficient and stable NBG PSCs. Self-floating TFPH cations allowed effective defect passivation and inhibition of Sn2+-Sn4+ oxidation, leading to a weak p-type surface (p−). Hence, the as-formed p/p− homojunction in turn accelerated the charge separation and reduced the non-radiative recombination. TFPHCl-modified NBG PSCs reached a stabilized PCE of 23.09% with an open-circuit voltage (Voc) of 0.88 V and excellent operational stability over 780 hours. Coupled with wide bandgap (WBG) subcells, TFPHCl-modified PTSCs ultimately attained an optimal PCE of 27.42% with long-term operational stability over 450 hours.

Authors with CRIS profile

Kaicheng Zhang Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

South China University of Technology (SCUT) / 华南理工大学 CN China (CN) Hong Kong University of Science and Technology (HKUST) / 香港科技大學 CN China (CN) Nanchang Hangkong University CN China (CN) Institute of Metal Research Chinese Academy of Sciences (IMR CAS) CN China (CN)

How to cite

APA:

Lin, Z., Chen, J., Duan, C., Fan, K., Li, J., Zou, S.,... Yan, K. (2024). Self-assembly construction of a homojunction of Sn-Pb perovskite using an antioxidant for all-perovskite tandem solar cells with improved efficiency and stability. Energy and Environmental Science, 17(17), 6314-6322. https://doi.org/10.1039/d4ee01539h

MLA:

Lin, Zhuojia, et al. "Self-assembly construction of a homojunction of Sn-Pb perovskite using an antioxidant for all-perovskite tandem solar cells with improved efficiency and stability." Energy and Environmental Science 17.17 (2024): 6314-6322.

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