Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
DOI: https://doi.org/10.29363/nanoge.iperop.2024.027
Publication date: 18th October 2023
Metal halide perovskites have attracted the attention of many scientists for their excellent optoelectronic properties. However, considering the environmental issues, the use of Pb in metal halide perovskites is not a good choice to be widely used in our daily life. Therefore, in recent years, Sn-based perovskites and other kinds of Pb-free perovskites have aroused great interest among scientists. It is hoped that the harm to the environment can be reduced. Among them, 2D Sn-based perovskites have been studied in the application of perovskite light-emitting diodes (PeLEDs). However, the easy oxidation of Sn from Sn2+ to Sn4+ tends to form detrimental Sn vacancies, which limits the efficiency of 2D Sn-based PeLEDs. In this study, we consider not only the solution to the problems associated with Sn-based perovskites, but also environmental concerns. Considering a more environmentally friendly process, we first investigated a series of natural antioxidants and then selected ascorbic acid (Vit C) as an additive to effectively inhibit the oxidation of Sn. In addition, we added the cyclic molecule 18-Crown-6 to trap excess ions and form a synergistic effect with VitC to significantly inhibit the defective state in PEA2SnI4 films. Finally, we demonstrate efficient 2D Sn-based PeLEDs with an emission wavelength centered at 630 nm and a maximum external quantum efficiency of 1.87%. This work provides a way to improve the performance of 2D Sn-based PeLEDs by adding natural antioxidants, thus further promoting the development of environmentally friendly PeLEDs.
The authors thank financial supports from the National Science and Technology Council (NSTC) in Taiwan (110-2923-E-002-007-MY3, 111-2124-M-002-021, 111-2923-E-002-006-MY3, 112-2628-E-002-031-, and 112-2223-E-002-008-MY4) and from Top University Project of National Taiwan University (112L7810).
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