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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MDPI AG
2021-09-01
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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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