Chalcogenide perovskites constitute a promising earth-abundant, non-toxic, and robust semiconductor family with the potential to compete with hybrid perovskites as high-quality photovoltaic absorbers. However, a low-temperature, solution-based synthesis route has eluded researchers in this area. Here we report the colloidal synthesis of chalcogenide perovskite BaZrS 3 nanoparticles at 330 °C in organic solvent. The nanoparticles (10−20 nm) are found to be comprised of smaller (3−5 nm) crystalline domains. Promising optoelectronic properties for the nanoparticles are measured, with photoluminescence decay times as high as 4.7 ns.
Chalcogenide perovskites have gained recent research attention as a promising semiconductor for photovoltaic and optoelectronic applications. In addition to the challenges that surround the synthesis and processing of these materials into devices, their phase stability in perovskite structures is an open research question. Reported syntheses presently lack clear phase stability criteria. In this work, we present a compelling phase stability analysis of sulfide ABS 3 and selenide ABSe 3 compounds on the basis of ionic radii and electronegativity arguments. This analysis is used to screen potential materials of interest as well as motivate further experimental research into several new perovskite compositions.
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