Thermal Conductivity of Chalcogenide As2S3 Thin Films

Abstract

In order to investigate the photo-induced thermal property changes in chalcogenide thin films, amorphous As 2 S 3 thin film samples, whose thicknesses are 0.5, 1.0, 2.0, and 4.0 µm, were prepared on silicon wafers by thermal evaporation. Their thermal conductivity was measured by the 3ω method between room temperature and 100 • C. These measurements were repeated after the illumination of an Ar + laser beam whose photon energy is consistent with the bandgap energy of As 2 S 3 , and repeated again for annealed films at 180 • C for 1 h. The result shows that the thermal conductivities of fresh films were 0.14 to 0.27 W · m −1 · K −1 ; however, the values increase to 0.28-0.47 W · m −1 · K −1 after illumination of the sample and decrease to 0.19-0.42 W · m −1 · K −1 after annealing of the sample. These changes can be explained by the change in microstructure produced from the photo-darkening and thermal annealing.

Femtosecond laser ablation of chalcogenide glass: explosive formation of nano-fibres against thermo-capillary growth of micro-spheres

“…The heat conductance acting along the jet tends to smooth out this effect. However, the low heat conductance of this material ∼ 0.2 W m −1 K −1 (known, in fact, only for solid and accepted in our calculations for liquid state [13]) can lead to significant temperature non-uniformity developing with time at the geometrical perturbation.…”

Study of glass transition kinetics of As 2 S 3 and As 2 Se 3 by ultrafast differential scanning calorimetry

“…The Biot number is defined as, Bi = L × h/κ, [7] where L is the sample thickness, h is the heat-transfer coefficient between the heater and surface (a typical value of 2 kW•m −2 •K −1 is employed in here), [11] and κ is the thermal conductivity of the sample. The value of κ at room temperature is in a range from 0.14 W•m −1 •K −1 to 0.27 W•m −1 •K −1 for As 2 S 3 , [12] and more than 0.14 W•m −1 •K −1 for As 2 Se 3 . [13] It should be noted that, we used the crushed flakes with a thickness of 2-5 microns for UDSC measurements.…”