Study on optical, electronic and thermal properties of β-In2S3 thin films using photothermal beam deflection technique

Warrier, Anita R.; Jayakrishnan, R.; John, Teny Theresa; Kartha, C. Sudha; Vijayakumar, K. P.

doi:10.1007/s10854-015-4201-y

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…The fitted S int values (relation 5) in the LITG experiment increased from 3.1 × 10 5 to 16.3 × 10 5 cm/s and 1.2 × 10 5 to 6.7 × 10 5 cm/s with increase of ∆N in the layers. Anita Warrier et al [31] determined similar values, which varied in the range, 5 × 10 3 -11 × 10 3 cm/s in β-In 2 S 3 films by using photothermal beam deflection technique. The interface related recombination lifetime (τ i ) is described by the following equation [32,33], where r eff is the average grain radius taken as 20 nm [20] and the D is taken to be > 0.2 cm 2 /s.…”

Section: Resultsmentioning

confidence: 88%

Determination of carrier lifetime in thermally evaporated In2S3 thin films by light induced transient grating technique

et al. 2020

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In 2 S 3 thin films were deposited onto soda lime glass substrates using thermal evaporation technique at a constant substrate temperature of 300 °C and the films were annealed in a sulfur ambient at 250 °C and 300 °C for 1 h. Light induced transient grating (LITG) technique was used to determine the carrier lifetime in In 2 S 3 thin films. The determined carrier lifetime values for different excitation energy densities, I 0 = 0.06-1.64 mJ/cm 2 decreased from 206 to 18 ps and 150 to 14 ps for the films annealed at 250 °C and 300 °C respectively. Further, the bimolecular, Auger recombination coefficients and diffusion coefficient were determined in the films. The observed bimolecular carrier recombination origin was explained by interface and Auger recombination processes.

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Section: Resultsmentioning

confidence: 88%

Determination of carrier lifetime in thermally evaporated In2S3 thin films by light induced transient grating technique

et al. 2020

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“…At present, several methods are known to determine the thermal conductivity and diffusivity of materials (Fox and McMaster, 1975;Ficker, 1996;Hurley et al, 2015;Keblinski et al, 2002;Xue and Xu, 2005;Gregorová, 2014;Xuan and Li, 2000;Putnam et al, 2006), (González et al 2014;Warrier et al 2015;Martínez et al 2015;Cobirzan et al 2016). Therefore, choosing the appropriate method in each particular situation is of great importance.…”

Section: Introductionmentioning

confidence: 99%

Photothermal Technique for Measuring Thermal Conductivity and Diffusivity of Nanofluids: A New Approach

Hechavarría¹,

Delgado²,

Hidalgo³

et al. 2018

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Nanofluids have become nowadays of special importance because of their different uses in industry, therefore, to propose methods to calculate their thermal properties would be useful. In this work, a new variant for the calculation of thermal conductivity and diffusivity of nanofluids is proposed; the possibilities and limitations of this non-stationary method, which uses light radiation as the heat source, are studied. Here, the light is homogenously incident on one of the end surfaces of a cylinder that has a thermally insulated side surface, setting the temperature at the other end to a constant value, then the temperature distribution is obtained as a function of the coordinate and time; adjusting the theoretical model, parabolic heat diffusion equation, to the experimental data obtained. The conditions of validity of the method to measure thermal diffusivity and thermal conductivity of fluids are analyzed; as well as, the way in which it could be used to verify the validity of the Hamilton and Crosser (HC) model in the case of nanofluids. Currently, nanofluids are used to exchange heat, as they have been found to exceed the potential of conventional refrigerants; however, the calculation of thermal properties still does not offer definitive values.

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“…Desde hace años existe el interés en el desarrollo de nuevos métodos para determinar la conductividad y difusividad térmicas de los compuestos. Esto se debe, en gran medida, al rápido avance de la ciencia de materiales y sus múltiples aplicaciones [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Existen los métodos estacionarios que, sin embargo, presentan la desventaja del prolongado tiempo de exposición al calor que sufre la muestra, aumentando considerablemente su temperatura y, por lo tanto, pudiendo incidir en la variación de sus características térmicas [6], [15], [16].…”

Section: Introductionunclassified

Cálculo numérico de las propiedades térmicas efectivas de un compuesto por elementos finitos

Díaz

López

Pazmiño

et al. 2017

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<p>El desarrollo de nuevos métodos para determinar las propiedades térmicas de materiales compuestos está siempre en constante avance. En este estudio se propone un método unidimensional para el cálculo numérico de la conductividad y difusividad térmicas efectivas en materiales sólidos heterogéneos (compuestos), entre [10--20 °C], mediante el uso del programa Solidworks 2016, el cual se basa en el método de cálculo de elementos finitos. Primero, se obtiene la distribución de temperatura en función de la coordenada y el tiempo; luego, se ajusta el modelo teórico, la ecuación parabólica de difusión del calor en una dimensión, a los datos obtenidos en la simulación para obtener la solución. Inicialmente, se modela la distribución de temperatura en una barra sólida de cobre homogénea, material conocido, bajo un flujo de calor constante en $x = L$, arrojando valores de conductividad y difusividad térmicas de acuerdo con los reportados en la literatura, con un error relativo de 0,01 % y 0,7 % respectivamente. Luego se modela la distribución de temperatura en una barra sólida heterogénea a base de cobre (65,7 %)-plomo (34,3 %) y, bajo la misma condición de flujo de calor, se obtienen los valores simulados de temperatura en función del tiempo con los cuales se calculan la conductividad y difusividad térmicas efectivas de este compuesto. Los resultados obtenidos muestran consistencia y confiabilidad pues se encuentran dentro del rango establecido por estudios anteriores.</p>

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Study on optical, electronic and thermal properties of β-In2S3 thin films using photothermal beam deflection technique

Cited by 5 publications

References 25 publications

Determination of carrier lifetime in thermally evaporated In2S3 thin films by light induced transient grating technique

Determination of carrier lifetime in thermally evaporated In2S3 thin films by light induced transient grating technique

Photothermal Technique for Measuring Thermal Conductivity and Diffusivity of Nanofluids: A New Approach

Cálculo numérico de las propiedades térmicas efectivas de un compuesto por elementos finitos

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