Mixed tin-lead perovskites with balanced crystallization and oxidation barrier for all-perovskite tandem solar cells

Jin Zhou, Shiqiang Fu, Shun Zhou, Lishuai Huang, Cheng Wang, Hongling Guan, Dexin Pu, Hongsen Cui, Chen Wang, Ti Wang, Weiwei Meng (), Guojia Fang () and Weijun Ke ()
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Jin Zhou: Wuhan University
Shiqiang Fu: Wuhan University
Shun Zhou: Wuhan University
Lishuai Huang: Wuhan University
Cheng Wang: Wuhan University
Hongling Guan: Wuhan University
Dexin Pu: Wuhan University
Hongsen Cui: Wuhan University
Chen Wang: Wuhan University
Ti Wang: Wuhan University
Weiwei Meng: South China Normal University
Guojia Fang: Wuhan University
Weijun Ke: Wuhan University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Mixed tin-lead perovskite solar cells have driven a lot of passion for research because of their vital role in all-perovskite tandem solar cells, which hold the potential for achieving higher efficiencies compared to single-junction counterparts. However, the pronounced disparity in crystallization processes between tin-based perovskites and lead-based perovskites, coupled with the easy Sn2+ oxidation, has long been a dominant factor contributing to high defect densities. In this study, we propose a multidimensional strategy to achieve efficient tin-lead perovskite solar cells by employing a functional N-(carboxypheny)guanidine hydrochloride molecule. The tailored N-(carboxypheny)guanidine hydrochloride molecule plays a pivotal role in manipulating the crystallization and grain growth of tin-lead perovskites, while also serving as a preservative to effectively inhibit Sn2+ oxidation, owing to the strong binding between N-(carboxypheny)guanidine hydrochloride and tin (II) iodide and the elevated energy barriers for oxidation. Consequently, single-junction tin-lead cells exhibit a stabilized power conversion efficiency of 23.11% and can maintain 97.45% of their initial value even after 3500 h of shelf storage in an inert atmosphere without encapsulation. We further integrate tin-lead perovskites into two-terminal monolithic all-perovskite tandem cells, delivering a certified efficiency of 27.35%.

Date: 2024
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DOI: 10.1038/s41467-024-46679-w

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