Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.171
Publication date: 18th December 2023
Metal-halide perovskites have been under intense research, for their capability to outperform the single-junction detailed-balance limit through the tandem device architecture by tuning the bandgap via compositional engineering. Mixed lead-tin halide perovskites offer the ideal low bandgap as the bottom subcell for such tandem photovoltaic devices. However, they suffer from various instabilities when exposed to ambient air, comparable to tin-halide perovskites. Mixed lead-tin halide perovskites have been considered to degrade in a manner akin to that of tin-halide perovskites, through formation of tin vacancies and self hole-doping. The differences in the way optoelectronic properties worsen and how trap states develop between FA0.75Cs0.25Pb0.5Sn0.5I3 and FA0.75Cs0.25SnI3 in ambient air were studied and compared in our work, which we present. When exposed to ambient air, both perovskite compositions are subject to optoelectronic degradation through development of trap states, evidenced by the reduction of charge-carrier diffusion lengths. However, it was revealed that deep trap states are formed in lead-tin perovskites during degradation, which deteriorates charge-carrier lifetimes but does not considerably affect charge-carrier sum mobilities. Tin-only perovskites, however, undergo formation of energetically shallow tin vacancy trap states and valence band doping. We also compare the structural degradation in these perovskites. The urge for specific passivation methods for mixed lead-tin iodide perovskites is emphasised in this work. We anticipate such passivation will lead to air stability enhancement, expediting the commercialisation of all-perovskite tandem devices.
Lim, V. J.-Y. et al., Air-Degradation Mechanisms in Mixed Lead-Tin Halide Perovskites for Solar Cells, Adv. Energy Mater. 2023, 13, 2200847
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