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THERMAL DIFFUSIVITY MEASUREMENTS BASED ON LASER INDUCED HEAT TRANSFER IN LOW-CONDUCTIVITY THIN FILMS

E. Krumov1,* , V. Mankov1, N. Starbov1

Affiliation

  1. Central Laboratory of Photoprocesses “Acad.Jordan Malinowski” – Bulgarian Academy of Sciences Acad.Georgy Bonchev str., bl.1091113 Sofia, Bulgaria

Abstract

Original experimental method for evaluation of thermal diffusivity coefficient of vacuum deposited thin films with low thermal conductivity is presented. For this purpose three layered samples are vacuum deposited onto precleaned glass substrate. Thin film of TeO2 or NaCl respectively is sandwiched between array of connected in series thin film thermocouples at the bottom and metal layer at the top. Nd:YAG laser radiation (l=1064nm, t=12ns) absorbed in the metal layer is used to create heat pulse in the sample. The heat released is transferred to the thermocouple array through the film studied with a delay proportional to thermal diffusivity of the sandwiched material. Further, a simple relation between the thermal diffusivity coefficient, film thickness and time of the thermoelectric response delay is used to estimate the thermal diffusivity of NaCl or TeO2 thin film. A relationship between the thermal properties and the microstructure of the film studied is revealed. Finally, it is demonstrated that the method applied is appropriate for studying of any thin film material with low thermal conductivity..

Keywords

Low-conductivity thin films, Transient heat-flow method, Thermal diffusivity.

Submitted at: Aug. 24, 2005
Accepted at: Sept. 22, 2005

Citation

E. Krumov, V. Mankov, N. Starbov, THERMAL DIFFUSIVITY MEASUREMENTS BASED ON LASER INDUCED HEAT TRANSFER IN LOW-CONDUCTIVITY THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 5, pp. 2619-2624 (2005)