TY  - JOUR
A1  - Kurilovich, Aleksandr A.
A1  - Mantsevich, Vladimir
A1  - Stevenson, Keith J.
A1  - Chechkin, Aleksei V.
A1  - Palyulin, V. V.
T1  - Complex diffusion-based kinetics of photoluminescence in semiconductor nanoplatelets
JF  - Physical chemistry, chemical physics : a journal of European Chemical Societies
N2  - 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.
Y1  - 2020
U6  - https://doi.org/10.1039/d0cp03744c
SN  - 1463-9076
SN  - 1463-9084
VL  - 22
IS  - 42
SP  - 24686
EP  - 24696
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Kurilovich, Aleksandr A.
A1  - Mantsevich, Vladimir N.
A1  - Mardoukhi, Yousof
A1  - Stevenson, Keith J.
A1  - Chechkin, Aleksei
A1  - Palyulin, Vladimir V.
T1  - Non-Markovian diffusion of excitons in layered perovskites and transition metal dichalcogenides
JF  - Physical chemistry, chemical physics : a journal of European Chemical Societies
N2  - The diffusion of excitons in perovskites and transition metal dichalcogenides shows clear anomalous, subdiffusive behaviour in experiments. 
In this paper we develop a non-Markovian mobile-immobile model which provides an explanation of this behaviour through paired theoretical and simulation approaches. 
The simulation model is based on a random walk on a 2D lattice with randomly distributed deep traps such that the trapping time distribution involves slowly decaying power-law asymptotics. 
The theoretical model uses coupled diffusion and rate equations for free and trapped excitons, respectively, with an integral term responsible for trapping. 
The model provides a good fitting of the experimental data, thus, showing a way for quantifying the exciton diffusion dynamics.
Y1  - 2022
U6  - https://doi.org/10.1039/d2cp00557c
SN  - 1463-9076
SN  - 1463-9084
VL  - 24
IS  - 22
SP  - 13941
EP  - 13950
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  -