Local structural aspects and electron-phonon interaction in halide double perovskites

Abstract

Perovskites are a diverse class of materials that have captured the attention of researchers for a variety of reasons, from advancing our fundamental understanding of solid-state physics to driving innovations in materials engineering for technological applications. Over the past decade, significant progress has been made in the study of Pb-based halide perovskites and organic-inorganic hybrid perovskites, particularly due to their potential for photovoltaic applications. While these materials exhibit excellent optoelectronic properties, they also present challenges such as the environmental toxicity of lead (Pb) and the instability of organic cations under ambient conditions, limiting their practical use in devices. An alternative to these issues is the inorganic Halide Double Perovskites (HDP), which are Pb-free, offer enhanced structural stability against heat, oxygen, and moisture, and retain strong optoelectronic properties.