Issue 17, 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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
08 Apr 2024
Accepted
22 Jul 2024
First published
23 Jul 2024

Energy Environ. Sci., 2024,17, 6314-6322

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

Z. Lin, J. Chen, C. Duan, K. Fan, J. Li, S. Zou, F. Zou, L. Yuan, Z. Zhang, K. Zhang, M. Y. Lam, S. A. Aleksandr, J. Qiu, K. S. Wong, H. Yan and K. Yan, Energy Environ. Sci., 2024, 17, 6314 DOI: 10.1039/D4EE01539H

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