Halide perovskites are promising semiconductors for thin-film photovoltaics, but contain toxic lead and suffer from stability issues. Gold-based double perovskites such as Cs₂Au₂Cl₆, provide a lead-free alternative with bandgaps well suited for solar energy conversion. Yet, their charge recombination pathways—radiative and non-radiative—remain poorly understood. Our recent work has shown that photoinjected carriers (electrons and holes) rapidly formnew quantum quasi-particle called polarons through strong interactions with phonons. The objective is therefore to investigate how this coupling influences carrier lifetimes. The internship aims to investigate the role of electron–phonon interactions in carrier recombination in gold-based perovskites. The student will combine transient absorption and time-resolved photoluminescence to probe radiative and non-radiative pathways and perform temperature-dependent studies using a cryostat to control phonon populations and explore the influence of lattice vibrations. The intern will work at IPVF, benefiting from state-of-the-art facilities for material growth, device fabrication, and optical/electronic characterization.