Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Photothermal Effects and Heat Conduction in Nanogranular Silicon Films

Version 1 : Received: 16 August 2021 / Approved: 17 August 2021 / Online: 17 August 2021 (10:45:12 CEST)

A peer-reviewed article of this Preprint also exists.

Kurbanova, B.A.; Mussabek, G.K.; Timoshenko, V.Y.; Lysenko, V.; Utegulov, Z.N. Photothermal Effects and Heat Conduction in Nanogranular Silicon Films. Nanomaterials 2021, 11, 2379. Kurbanova, B.A.; Mussabek, G.K.; Timoshenko, V.Y.; Lysenko, V.; Utegulov, Z.N. Photothermal Effects and Heat Conduction in Nanogranular Silicon Films. Nanomaterials 2021, 11, 2379.

Journal reference: Nanomaterials 2021, 11, 2379
DOI: 10.3390/nano11092379

Abstract

We present the results on 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. Finite difference time domain (FDTD) and finite element mesh (FEM) modeling of absorbed light intensity and photo-induced spatial temperature distribution across the Si NP films were well correlated with the local temperatures measured by micro-Raman spectroscopy and used for determination of heat conductivities in the films of various thicknesses. Cubic-to-hexagonal phase transition in these films caused by laser heating was found to be heavily influenced by the film thickness and heat conductive properties of glass substrate, on which the films were deposited. Heat conductivities across the drop-casted Si nanogranular films were found to be in the range of lowest heat conductivities 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.

Keywords

silicon; nanogranular; nanoparticle; porous; void; thin film; laser heating; photo-thermal; temperature; Raman; phonons; heat conduction; phase transition; finite element modeling

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