1. Photothermal Effects and Heat Conduction in Nanogranular Silicon Films
- Author
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Zhandos N. Utegulov, Bayan A. Kurbanova, G.K. Mussabek, Vladimir Lysenko, Viktor Y. Timoshenko, Nazarbayev University [Kazakhstan], Al-Farabi Kazakh National University [Almaty] (KazNU), The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], Lomonosov Moscow State University (MSU), P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow] (LPI RAS), Russian Academy of Sciences [Moscow] (RAS), Formation, élaboration de nanomatériaux et cristaux (FENNEC), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
- Subjects
thin film ,FDTD ,General Chemical Engineering ,02 engineering and technology ,Substrate (electronics) ,condensed_matter_physics ,01 natural sciences ,photothermal ,[SPI]Engineering Sciences [physics] ,thermal conductivity ,General Materials Science ,Composite material ,Mussabek ,Raman ,[PHYS]Physics [physics] ,010302 applied physics ,G.K ,Timoshenko ,porous ,nanoparticle ,heat conduction ,021001 nanoscience & nanotechnology ,Thermal conduction ,Chemistry ,B.A ,symbols ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,0210 nano-technology ,Materials science ,Silicon ,nanostructure ,phonons ,chemistry.chemical_element ,Z.N silicon ,drop casting ,Article ,symbols.namesake ,Thermal conductivity ,void ,0103 physical sciences ,[CHIM]Chemical Sciences ,Thin film ,QD1-999 ,Kurbanova ,Lysenko ,FEM ,Phonon scattering ,V ,temperature ,silicon ,finite element modeling ,nanogranular ,Utegulov ,laser heating ,Evaporation (deposition) ,V.Y ,Light intensity ,chemistry ,phase transition ,Raman spectroscopy - Abstract
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 k 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 k values in drop-casted Si nanogranular films were found to be in the range of lowest k 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.
- Published
- 2021
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