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Issue 42, 2020
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Complex diffusion-based kinetics of photoluminescence in semiconductor nanoplatelets

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Abstract

We present a diffusion-based simulation and theoretical models for explanation of the photoluminescence (PL) emission intensity in semiconductor nanoplatelets. It is shown that the shape of the PL intensity curves can be reproduced by the interplay of recombination, diffusion and trapping of excitons. The emission intensity at short times is purely exponential and is defined by recombination. At long times, it is governed by the release of excitons from surface traps and is characterized by a power-law tail. We show that the crossover from one limit to another is controlled by diffusion properties. This intermediate region exhibits a rich behaviour depending on the value of diffusivity. The proposed approach reproduces all the features of experimental curves measured for different nanoplatelet systems.

Graphical abstract: Complex diffusion-based kinetics of photoluminescence in semiconductor nanoplatelets

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Article information


Submitted
13 Jul 2020
Accepted
02 Oct 2020
First published
19 Oct 2020

This article is Open Access

Phys. Chem. Chem. Phys., 2020,22, 24686-24696
Article type
Paper

Complex diffusion-based kinetics of photoluminescence in semiconductor nanoplatelets

A. A. Kurilovich, V. N. Mantsevich, K. J. Stevenson, A. V. Chechkin and V. V. Palyulin, Phys. Chem. Chem. Phys., 2020, 22, 24686
DOI: 10.1039/D0CP03744C

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