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Sodium Incorporation for Enhanced Performance of Two-Dimensional Sn-Based Perovskite Transistors.

Ji-Young GoHuihui ZhuYoujin ReoHyunjun KimAo LiuYong-Young Noh
Published in: ACS applied materials & interfaces (2022)
Two-dimensional metal halide perovskites (2D MHPs) are promising candidates for transistor channel materials because of their high mobility in the lateral direction; however, Sn-based 2D MHPs exhibit poor film quality and oxidation stability. Here, we report a simple method to improve the performance and stability of 2D MHP transistors by incorporating sodium iodide (NaI) additives. By adding 1 vol % NaI (Na1), the transistors with phenethylammonium tin iodide (PEA 2 SnI 4 ) exhibited reduced dual-sweep hysteresis, robust bias stability, and larger hole mobility (2.13 cm 2 V -1 s -1 ) than that of a pristine device (0.39 cm 2 V -1 s -1 ). Improvements in the film quality, such as increased grain size, crystallinity, and better film coverage, were observed in the PEA 2 SnI 4 :NaI film. In addition, NaI effectively passivated the iodine vacancies at the grain boundaries, thereby suppressing the defects.
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