Metal halide perovskites (MHPs) are promising semiconductors combining high photovoltaic performance with simple, low-cost fabrication. Their tunable bandgap, strong spin–orbit coupling, and long carrier diffusion lengths make them attractive for light-emitting, spintronic, and quantum photonic applications. Upon optical excitation, hot carriers are generated and quickly thermalize through carrier–carrier scattering before cooling via carrier–phonon interactions, a process that can be slowed by strong electron–phonon coupling and phonon bottlenecks. This internship, part of the ANR SPOIR project, aims to investigate ultrafast carrier and exciton dynamics in MHPs, identify trapping states, and link structural quality to optoelectronic performance using femtosecond transient absorption, time-resolved photoluminescence, and photo-induced Faraday rotation. Applicants should have a background in solid-state physics or optics and a strong interest in experimental spectroscopy.