Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.347
Publication date: 18th December 2023
Two-dimensional hybrid perovskites are a highly intriguing class of materials, composed of alternating inorganic and organic molecular layers. Their reduced dimensionality combined with weak dielectric screening leads to the formation of tightly bound excitons that efficiently absorb and emit radiation. A central questions for excitons in perovskites from the perspectives of both fundamental physics and applications is their mobility. In addition, the external control of their optical response has proven difficult due to challenges to introduce electrical doping into this class of materials.
In this talk I will focus on studies of optically detected exciton transport in 2D perovskites via ultrafast microscopy, discussing different regimes of propagation including free and localized states. I will show how the excitons behave at the structural phase transition and how their transport is determined by strong interactions with the lattice vibrations. In the second part, I will illustrate how the formation of electrically tunable trions, bound states of excitons in free carriers can be achieved in these hybrid semiconductors to optically detect doping. The trions in 2D perovskites are stable for both n- and p- doped regimes, feature unusually large binding energies and a substantial mobility at elevated temperatures.
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