Excellent Long-Range Charge-Carrier Mobility in 2D Perovskites
Fundacio Scito (2022)
Excellent long-range charge-carrier mobility in 2D perovskites
Advanced Functional Materials (2022)
Ultra-narrow room-temperature emission from single CsPbBr3 perovskite quantum dots.
Nature communications Springer Nature 13:1 (2022) 2587
Abstract:
Semiconductor quantum dots have long been considered artificial atoms, but despite the overarching analogies in the strong energy-level quantization and the single-photon emission capability, their emission spectrum is far broader than typical atomic emission lines. Here, by using ab-initio molecular dynamics for simulating exciton-surface-phonon interactions in structurally dynamic CsPbBr<sub>3</sub> quantum dots, followed by single quantum dot optical spectroscopy, we demonstrate that emission line-broadening in these quantum dots is primarily governed by the coupling of excitons to low-energy surface phonons. Mild adjustments of the surface chemical composition allow for attaining much smaller emission linewidths of 35-65 meV (vs. initial values of 70-120 meV), which are on par with the best values known for structurally rigid, colloidal II-VI quantum dots (20-60 meV). Ultra-narrow emission at room-temperature is desired for conventional light-emitting devices and paramount for emerging quantum light sources.Robust excitons across the phase transition of two-dimensional hybrid perovskites
(2022)
Excellent Long-Range Charge-Carrier Mobility in 2D Perovskites
University of Oxford (2022)