Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.235
Publication date: 18th December 2023
Although tin-based perovskite solar cells (PSCs) are regarded as a good replacement for lead-based PSCs due to their environmental friendliness and a suitable band gap, tin-based PSCs still have stability and efficiency issues to overcome related to their fabrication process. Specifically, it is well known that DMSO, the most popular solvent used in the fabrication of hybrid perovskites, triggers the oxidation of Sn2+ to Sn4+. Additionally, tin-based perovskite materials suffer from uncontrolled crystallization, leading to a high density of defect states and non-radiative recombination sites. Here, we explore solvent alternatives to DMSO with the aim of preventing Sn2+ oxidation and reducing the density of defect states and unnecessary non-radiative recombination sites. Moreover, we test the photovoltaic performance and stability of the devices, as compared to those prepared with a DMSO-containing solvent system and correlate it to the optoelectronic and charge carrier dynamics properties of the tin-based perovskite materials.
Keywords: tin-based PSCs, solvent engineering, DMSO-free.
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