Photothermal Effects and Heat Conduction in Nanogranular Silicon Films

We present results on the photothermal (PT) and heat conductive properties of nanogranular silicon (Si) films synthesized by evaporation of colloidal droplets (drop-casting) of 100 ± 50 nm-sized crystalline Si nanoparticles (NP) deposited on glass substrates. Simulations of the absorbed light intens...

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Main Authors: Bayan A. Kurbanova, Gauhar K. Mussabek, Viktor Y. Timoshenko, Vladimir Lysenko, Zhandos N. Utegulov
Format: Article
Language:English
Published: MDPI AG 2021-09-01
Series:Nanomaterials
Subjects:
Online Access:https://www.mdpi.com/2079-4991/11/9/2379
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author Bayan A. Kurbanova
Gauhar K. Mussabek
Viktor Y. Timoshenko
Vladimir Lysenko
Zhandos N. Utegulov
author_facet Bayan A. Kurbanova
Gauhar K. Mussabek
Viktor Y. Timoshenko
Vladimir Lysenko
Zhandos N. Utegulov
author_sort Bayan A. Kurbanova
collection DOAJ
description We present results on the photothermal (PT) and heat conductive properties of nanogranular silicon (Si) films synthesized by evaporation of colloidal droplets (drop-casting) of 100 ± 50 nm-sized crystalline Si nanoparticles (NP) deposited on glass substrates. Simulations of the absorbed light intensity and photo-induced temperature distribution across the Si NP films were carried out by using the Finite difference time domain (FDTD) and finite element mesh (FEM) modeling and the obtained data were compared with the local temperatures measured by micro-Raman spectroscopy and then was used for determining the heat conductivities <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>k</mi></semantics></math></inline-formula> in the films of various thicknesses. The cubic-to-hexagonal phase transition in Si NP films caused by laser-induced heating was found to be heavily influenced by the film thickness and heat-conductive properties of glass substrate, on which the films were deposited. The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>k</mi></semantics></math></inline-formula> values in drop-casted Si nanogranular films were found to be in the range of lowest <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>k</mi></semantics></math></inline-formula> of other types of nanostructurely voided Si films due to enhanced phonon scattering across inherently voided topology, weak NP-NP and NP-substrate interface bonding within nanogranular Si films.
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spelling doaj.art-e51281c0ea3441ceb5da8ae8237c9e572023-11-22T14:31:39ZengMDPI AGNanomaterials2079-49912021-09-01119237910.3390/nano11092379Photothermal Effects and Heat Conduction in Nanogranular Silicon FilmsBayan A. Kurbanova0Gauhar K. Mussabek1Viktor Y. Timoshenko2Vladimir Lysenko3Zhandos N. Utegulov4Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, KazakhstanFaculty of Physics and Technology, Al-Farabi Kazakh National University, Almaty 050040, KazakhstanLaboratory “Nanotheranostics”, Institute of Engineering Physics for Biomedicine, National Research Nuclear University “MEPhI”, 115409 Moscow, RussiaLaboratory “Nanotheranostics”, Institute of Engineering Physics for Biomedicine, National Research Nuclear University “MEPhI”, 115409 Moscow, RussiaDepartment of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, KazakhstanWe present results on the photothermal (PT) and heat conductive properties of nanogranular silicon (Si) films synthesized by evaporation of colloidal droplets (drop-casting) of 100 ± 50 nm-sized crystalline Si nanoparticles (NP) deposited on glass substrates. Simulations of the absorbed light intensity and photo-induced temperature distribution across the Si NP films were carried out by using the Finite difference time domain (FDTD) and finite element mesh (FEM) modeling and the obtained data were compared with the local temperatures measured by micro-Raman spectroscopy and then was used for determining the heat conductivities <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>k</mi></semantics></math></inline-formula> in the films of various thicknesses. The cubic-to-hexagonal phase transition in Si NP films caused by laser-induced heating was found to be heavily influenced by the film thickness and heat-conductive properties of glass substrate, on which the films were deposited. The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>k</mi></semantics></math></inline-formula> values in drop-casted Si nanogranular films were found to be in the range of lowest <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>k</mi></semantics></math></inline-formula> of other types of nanostructurely voided Si films due to enhanced phonon scattering across inherently voided topology, weak NP-NP and NP-substrate interface bonding within nanogranular Si films.https://www.mdpi.com/2079-4991/11/9/2379siliconnanogranularnanoparticlenanostructureporousvoid
spellingShingle Bayan A. Kurbanova
Gauhar K. Mussabek
Viktor Y. Timoshenko
Vladimir Lysenko
Zhandos N. Utegulov
Photothermal Effects and Heat Conduction in Nanogranular Silicon Films
Nanomaterials
silicon
nanogranular
nanoparticle
nanostructure
porous
void
title Photothermal Effects and Heat Conduction in Nanogranular Silicon Films
title_full Photothermal Effects and Heat Conduction in Nanogranular Silicon Films
title_fullStr Photothermal Effects and Heat Conduction in Nanogranular Silicon Films
title_full_unstemmed Photothermal Effects and Heat Conduction in Nanogranular Silicon Films
title_short Photothermal Effects and Heat Conduction in Nanogranular Silicon Films
title_sort photothermal effects and heat conduction in nanogranular silicon films
topic silicon
nanogranular
nanoparticle
nanostructure
porous
void
url https://www.mdpi.com/2079-4991/11/9/2379
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AT viktorytimoshenko photothermaleffectsandheatconductioninnanogranularsiliconfilms
AT vladimirlysenko photothermaleffectsandheatconductioninnanogranularsiliconfilms
AT zhandosnutegulov photothermaleffectsandheatconductioninnanogranularsiliconfilms