Two-Dimensional Dion-Jacobson Tin Halide Perovskite Transistors Based on Linear and Piperidinium A Cations
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Metal halide perovskites exhibit high charge carrier mobility and adjustable bandgap, showing promise for advanced optoelectronic devices. Two-dimensional (2D) perovskites have enhanced moisture stability and reduced ion migration compared to 3D perovskites due to bulky organic spacers. Unlike the Ruddlesden-Popper phase, Dion-Jacobson (DJ) phase with a single diammonium offers stronger interlayer connection through hydrogen bonds, leading to greater crystal stability and improved charge transfer. Studies on 2D DJ phase perovskite transistors using different types of spacer cations are yet to be investigated. In this study, we developed DJ Sn2+ perovskite thin-film transistors using various A-site diammonium cations. The film morphology, crystallinity, optical and electrical properties are largely dependent on each characteristic feature of the diammonium cations. The enhanced operational stability of 2D DJ perovskite transistors shows a promising future in their optoelectronic applications.