Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
In this work, we study the complex dynamics of exciton versus free carrier transport in bulk epitaxial perovskite materials by utilizing temperature-dependent time-resolved photoluminescence microscopy (TPLM). While significant advancements have been made in understanding charge transport in bulk (3D) halide perovskites, with theories explaining long carrier diffusion lengths, the realm of exciton transport remains largely unexplored. This gap in knowledge prompts a pivotal question regarding the mechanisms governing exciton movement in these materials, particularly concerning the transition between free-carrier and exciton-dominated transport modes and the implications of such transitions. Our adoption of TPLM technique, diverging from conventional transport measurement methods (e.g. THz photoconductivity, field-effect transistors and Hall-effect) that primarily are sensitive to free carriers, aims to shed light on the temperature and power dependence of photoluminescence (PL) intensity, offering insights into exciton-dominated dynamics versus free carrier effects. Moreover, this study paves the way for uncovering phenomena such as superradiant exciton transport in perovskites and setting a benchmark for the further exploration of carrier transport in various other low-dimensional perovskites.
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