Authors
Lijuan He, Haoran Wang, Zhaojin Wang, Zhongliang Yan, Arui Huang, Jing Zhang, Xueying Yang, Miao Zeng, Zaiwei Wang, Guang Yang, Zhifang Shi, Wei Zhang, Liang Shen, Yang Bai, Hui-Ming Cheng
Published in
Science advances. Volume 12. Issue 28. Pages eaeb8790. Jul 10, 2026. Epub Jul 10, 2026.
Abstract
All-perovskite tandem solar cells (TSCs) hold a substantial promise for achieving ultrahigh-efficiency photovoltaics beyond the Shockley-Queisser limit. However, their development has been hampered by challenges associated with a narrow-bandgap tin-lead (Sn-Pb) perovskite subcell. A key issue is inhomogeneous Sn/Pb distribution during crystallization, which generates trap states and accelerates degradation. Here, we introduce a molecular stabilization strategy by using S-allyl-l-cysteine (SALC) as a ligand that preferentially coordinates with tin(II) iodide (SnI2), thereby modulating crystallization kinetics. The strong thioether coordination leads to spatially uniform Sn/Pb distribution, and 3.5-fold reduction in Sn(IV) content due to the reduction capability of functional groups in SALC. Consequently, the resulting Sn-Pb perovskite solar cells achieve a champion power conversion efficiency (PCE) of 22.99% with an exceptional open-circuit voltage of 0.892 V. When integrated into all-perovskite TSCs, a certified PCE of 28.84% (29.44% laboratory-measured) is achieved along with a great improvement in operational stability compared to control devices, retaining nearly 90% of initial PCE after 420 hours of the maximum power point tracking under 1 sun illumination in ambient air.
PMID:
42430489
Bibliographic data and abstract were imported from PubMed on 11 Jul 2026.
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