Methylammonium-free, high-efficiency, and stable all-perovskite tandem solar cells enabled by multifunctional rubidium acetate

Liao X, Jia X, Li W, Lang X, Zhang J, Zhao X, Ji Y, Du Q, Kuan CH, Ren Z, Huang W, Bai Y, Zhang K, Xiao C, Lin Q, Cheng YB, Tong J (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Nature Communications Nature Publishing Group: Nature Communications

Book Volume: 16

Pages Range: 1164-

Journal Issue: 1

DOI: 10.1038/s41467-025-56549-8

Abstract

All-perovskite tandem solar cells (APTSCs) offer the potential to surpass the Shockley-Queisser limit of single-junction solar cells at low cost. However, high-performance APTSCs contain unstable methylammonium (MA) cation in the tin-lead (Sn-Pb) narrow bandgap subcells. Currently, MA-free Sn-Pb perovskite solar cells (PSCs) show lower performance compared with their MA-containing counterparts. This is due to the high trap density associated with Sn2+ oxidation, which is exacerbated by the rapid crystallization of MA-free Sn-containing perovskite. Here, a multifunctional additive rubidium acetate (RbAC) is proposed to passivate Sn-Pb perovskite. We find that RbAC can suppress Sn2+ oxidation, alleviate microstrain, and improve the crystallinity of the MA-free Sn-Pb perovskite. Consequently, the resultant Sn-Pb PSCs achieve a power conversion efficiency (PCE) of 23.02%, with an open circuit voltage (Voc) of 0.897 V, and a filling factor (FF) of 80.64%, and more importantly the stability of the device is significantly improved. When further integrated with a 1.79-electron volt MA-free wide-bandgap PSC, a 29.33% (certified 28.11%) efficient MA-free APTSCs with a high Voc of 2.22 volts is achieved.

Authors with CRIS profile

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

Involved external institutions

Wuhan University of Technology CN China (CN) Hong Kong Polytechnic University (PolyU) CN China (CN) Shenzhen University of Advanced Technology / 深圳理工大学 CN China (CN) Ningbo Institute of Industrial Technology / Ningbo Institute of Materials Technology & Engineering (NIMTE) / 中国科学院宁波材料技术与工程研究所 CN China (CN) Wuhan University CN China (CN) National Yang Ming Chiao Tung University TW Taiwan (TW)

How to cite

APA:

Liao, X., Jia, X., Li, W., Lang, X., Zhang, J., Zhao, X.,... Tong, J. (2025). Methylammonium-free, high-efficiency, and stable all-perovskite tandem solar cells enabled by multifunctional rubidium acetate. Nature Communications, 16(1), 1164-. https://doi.org/10.1038/s41467-025-56549-8

MLA:

Liao, Xufeng, et al. "Methylammonium-free, high-efficiency, and stable all-perovskite tandem solar cells enabled by multifunctional rubidium acetate." Nature Communications 16.1 (2025): 1164-.

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