Photothermal effects and heat conduction in nanogranular silicon films
Kurbanova B.A. Mussabek G.K. Timoshenko V.Y. Lysenko V. Utegulov Z.N.
September 2021MDPI
Nanomaterials
2021#11Issue 9
We present results on the photothermal (PT) and heat conductive properties of nanogranu-lar 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.
Drop casting , FDTD , FEM , Finite element modeling , Heat conduction , Laser heating , Nanogranular , Nanoparticle , Nanostructure , Phase transition , Phonons , Photothermal , Porous , Raman , Silicon , Temperature , Thermal conductivity , Thin film , Void
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Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Faculty of Physics and Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Laboratory “Nanotheranostics”, Institute of Engineering Physics for Biomedicine, National Research Nuclear University “MEPhI”, Moscow, 115409, Russian Federation
Faculty of Physics, Lomonosov Moscow State University, Moscow, 119911, Russian Federation
Lebedev Physical Institute of RAS, Moscow, 119911, Russian Federation
Light Matter Institute, UMR-5306, Claude Bernard University of Lyon, 2 rue Victor Grignard, Villeurbanne, 69622, France
Department of Physics
Faculty of Physics and Technology
Laboratory “Nanotheranostics”
Faculty of Physics
Lebedev Physical Institute of RAS
Light Matter Institute
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