卤化物
锡
铅(地质)
材料科学
纳米技术
化学
无机化学
冶金
地质学
地貌学
作者
Christopher T. Triggs,R. Dominic Ross,Willa Mihalyi-Koch,Catherine F. M. Clewett,Kyana M. Sanders,Ilia A. Guzei,Song Jin
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2024-04-01
卷期号:: 1835-1843
标识
DOI:10.1021/acsenergylett.4c00615
摘要
Two-dimensional (2D) tin halide perovskites are promising tunable lead-free semiconductors for photovoltaic and optoelectronic devices. However, their poorer air stability relative to that of their toxic lead counterparts limits their applications. Here, we systematically compare a series of four 2D Ruddlesden-Popper and Dion-Jacobson tin iodide perovskites with different organic spacer cations to elucidate the spacer cation structural motifs that enhance air stability. Using several complementary characterization techniques, we find that 2D tin perovskites that contain rigid spacer cations that are halogenated or divalent greatly improve air stability compared to the reference (PEA)2SnI4 (PEA = phenethylammonium) and show minimal degradation even after several weeks of ambient air exposure. We find that there is a correlation between interlayer space filling and air stability, suggesting that tightly packed interlayers impede oxidation beyond the surface and enable high bulk stability. This study informs design principles for enhanced air stability in 2D tin halide perovskites for stable, high performance devices.
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