Sakdanuphab, Rachsak
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Preferred name
Sakdanuphab, Rachsak
Alternative Name
Sakdanuphab, R.
Sakdanuphab, Rachasak
Main Affiliation
Email
rachsak.sa@kmitl.ac.th
14 results
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Item type:Publication, Simultaneous Seebeck coefficient and electrical conductivity enhancement of GeSbTe films via Sn addition(2022-06-15); ; Sn-added GeSbTe (GST) thin films were deposited using a co-magnetron sputtering technique. The effects of varying the Sn content through a variable Sn target sputtering power and post annealing at 673 K were investigated. The DC power density applied to the GST target was controlled at 50 W, while the power density of the Sn target was increased from 0 W to 40 W. The results demonstrate the coexistence of the fcc-GST, hcp-GST and SnTe phases in the Sn-added GST thin films. The substitution of Sn at the Ge-site increases the crystallization speed and leads to defects and lattice disordered local arrangement in the GST films, causing the Seebeck coefficient to increase. The SnTe phase was created as a result of the high Sn content in the sample due to the over-doping limit of Sn into the GST structure. The presence of SnTe in Sn-doped GST films increased the electrical conductivity. The maximum power factor of 17.0 μW/cmK<sup>2</sup> at 450 K was obtained at an Sn content of 14.7 at%. These results indicated that the thermoelectric properties of Sn-doped GST films were improved via the formation of an appropriate amount of SnTe composite. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Energy-saving synthesis and β-phase enhancement of Cu2Se thermoelectric materials via the microwave hybrid heating technique(2021-10-25); ; ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thickness Dependence of Thermoelectric Properties and Maximum Output Power of Single Planar Sb2Te3 Films(2022-12-01); Hatayothai, ChanonP-type Sb<inf>2</inf>Te<inf>3</inf> films with different thicknesses were deposited on polyimide substrates via heat treatment-assisted DC magnetron sputtering. The correlations between the thickness variance and the structure, dislocation density, surface morphology, thermoelectric properties and output power are investigated. As a result, it is clear that the film thickness and the heat treatment process during growth are related to the diffusion of deposited atoms on the substrate surface, leading to imperfection defects inside the films. The imperfections inside the films are affected by their properties. This work also presents the thermoelectric efficiency of a planar single leg of the deposited films with various thicknesses. The maximum power factor is 2.73 mW/mK<sup>2</sup> obtained with a film thickness of 9.0 µm and an applied temperature of 100 °C. Planar Sb<inf>2</inf>Te<inf>3</inf> produced a maximum output power of 0.032 µW for a temperature difference of 58 K. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of annealing temperature on thermoelectric properties of bismuth telluride thick film deposited by DC magnetron sputtering(2020-07-15); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Improving the thermoelectric properties of thick Sb2Te3 film via Cu doping and annealing deposited by DC magnetron sputtering using a mosaic target(2021-11-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Achieving thermoelectric improvement through the addition of a small amount of graphene to CuAlO2 synthesized by solid-state reaction(2018-07-15); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Improving the photo-thermoelectric performance of CuAlO2 via doping with Bi(2021-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of real working environment/formation of oxide phase on thermoelectric properties of flexible Sb2Te3 films(2019-09-01); ; Flexible Sb<inf>2</inf>Te<inf>3</inf> thin films, for thermoelectric generator applications, were deposited by DC magnetron sputtering. As-deposited films were annealed in air to simulated a realistic operating environment. The oxidation behavior of the films was studied by monitoring their phase change on exposure to air at different temperatures between 50 and 300 °C for annealing times from 1 to 15 h. Oxidation of Sb and Te formed Sb<inf>2</inf>Te<inf>4</inf> and TeO<inf>2</inf> phases when annealing above 100 °C and Sb<inf>2</inf>Te<inf>3</inf> decomposed into oxide phases at an annealing temperature of 250 °C for 15 h. The thermoelectric performance decreased as the content of Sb<inf>2</inf>O<inf>4</inf> and TeO<inf>2</inf> phases increased. These findings show the limitations of Sb<inf>2</inf>Te<inf>3</inf> films operating in air without vacuum or a protective environment. We propose that the kinetic growth of oxide formation on the Sb<inf>2</inf>Te<inf>3</inf> thin films depend on chemical activation energy and oxygen diffusion through the oxide barrier by the variation of annealing temperature and annealing time, respectively. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Figure of merit improvement of delafossite CuAlO2 with the addition of Fe and graphene(2019-11-01); This study investigated the synthesis of delafossite CuAlO<inf>2</inf> with Fe and graphene through a solid-state reaction method. The results of X-ray diffractometry showed that graphene was insoluble in delafossite CuAlO<inf>2</inf> while Fe was substituted into Al sites, expanding the d-spacing. From X-ray photoelectron spectroscopy, graphene induced excess oxygen in the delafossite CuAlO<inf>2</inf> structure via C–O–Cu bonds and improved the electrical conductivity. In addition, the thermal conductivity was reduced due to generation of point defects, phonon-phonon Umklapp and carrier-phonon scattering. The addition of Fe and graphene in CuAlO<inf>2</inf> shows an improvement of ZT to 0.0114 at 573 K. This is attributable to its increase in charge carrier density, as well as a decrease in thermal conductivity. This study highlights the benefits of combining Fe and graphene in delafossite CuAlO<inf>2</inf> as a prospective process for attaining a high figure of merit thermoelectric materials. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Enhancement of thermoelectric properties in rapidly synthesised β-Cu2Se using optimized Cu content and microwave hybrid heating(2024-01-15); ;