Interface Engineering by Small Molecules toward Efficient Hole Transport Layer-Free Sn–Pb Perovskite Solar Cells with High Fill Factors DOI
Yu Xu, Jiayu You, Jingwei Zhu

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: May 3, 2025

Low-bandgap (LBG) tin-lead (Sn-Pb) perovskites are essential for tandem solar cells but face challenges because the use of a hygroscopic PEDOT:PSS hole transport layer (HTL) reduces device stability. A HTL-free structure can overcome these issues introduces new drawbacks like imbalanced carrier and severe recombination. This study 3-amino-5-mercapto-1,2,4-triazole (AMTZ) as rear interface passivator to simultaneously mitigate defects stabilize Sn-Pb perovskite films. The aromatic triazole group AMTZ coordinates with dangling Pb2+/Sn2+ cations reduce trap states, while reducing thiol (-SH) suppresses Sn2+ oxidation. In addition, post-treatment also modulates energy-level alignments, promoting fluent charge transfer in (PSCs). Consequently, we achieved efficient LBG PSCs champion efficiency 21.87% an impressive fill factor over 80%. Moreover, optimized maintained 80% initial upon 550 h storage. work demonstrates viable strategy developing stable through interfacial engineering.

Language: Английский

Interface Engineering by Small Molecules toward Efficient Hole Transport Layer-Free Sn–Pb Perovskite Solar Cells with High Fill Factors DOI
Yu Xu, Jiayu You, Jingwei Zhu

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: May 3, 2025

Low-bandgap (LBG) tin-lead (Sn-Pb) perovskites are essential for tandem solar cells but face challenges because the use of a hygroscopic PEDOT:PSS hole transport layer (HTL) reduces device stability. A HTL-free structure can overcome these issues introduces new drawbacks like imbalanced carrier and severe recombination. This study 3-amino-5-mercapto-1,2,4-triazole (AMTZ) as rear interface passivator to simultaneously mitigate defects stabilize Sn-Pb perovskite films. The aromatic triazole group AMTZ coordinates with dangling Pb2+/Sn2+ cations reduce trap states, while reducing thiol (-SH) suppresses Sn2+ oxidation. In addition, post-treatment also modulates energy-level alignments, promoting fluent charge transfer in (PSCs). Consequently, we achieved efficient LBG PSCs champion efficiency 21.87% an impressive fill factor over 80%. Moreover, optimized maintained 80% initial upon 550 h storage. work demonstrates viable strategy developing stable through interfacial engineering.

Language: Английский

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