Complex diffusion-based kinetics of photoluminescence in semiconductor nanoplatelets

We present a diffusion-based simulation and theoretical models for explanation of photoluminescence (PL) emission intensity in semiconductor nanoplatelets. It is shown that the shape of PL intensity curves can be reproduced by the interplay of recombination, diffusion and trapping of excitons. The e...

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Bibliographic Details
Published inarXiv.org
Main Authors Kurilovich, Aleksandr A, Mantsevich, Vladimir N, Stevenson, Keith J, Chechkin, Aleksei V, Palyulin, Vladimir V
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 17.01.2021
Subjects
Crossovers
Diffusion
Emission
Excitons
Photoluminescence
Physics - Mesoscale and Nanoscale Physics
Physics - Statistical Mechanics
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Summary:We present a diffusion-based simulation and theoretical models for explanation of photoluminescence (PL) emission intensity in semiconductor nanoplatelets. It is shown that the shape of 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. Proposed approach reproduces all the features of experimental curves measured for different nanoplatelet systems.
ISSN:2331-8422
DOI:10.48550/arxiv.2101.06623