Browsing by Author "Symeou, E."
Now showing items 1-10 of 10
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Article
Ambiguous Role of Growth-Induced Defects on the Semiconductor-to-Metal Characteristics in Epitaxial VO2/TiO2 Thin Films
Mihailescu, C. N.; Symeou, E.; Svoukis, E.; Negrea, R. F.; Ghica, C.; Teodorescu, V.; Tanase, L. C.; Negrila, C.; Giapintzakis, John (2018)Controlling the semiconductor-to-metal transition temperature in epitaxial VO2 thin films remains an unresolved question both at the fundamental as well as the application level. Within the scope of this work, the effects ...
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Article
Effect of silicon nitride/oxide on the structure and the thermal conductivity of CoSi nanocomposites
Ioannou, M.; Delimitis, A.; Symeou, E.; Giapintzakis, John; Kyratsi, Theodora (2017)In this work, the fabrication of nanocomposites with silicon nitride/oxide into the thermoelectric matrix of cobalt silicide is presented. The different concentrations of nano-Si3N4 were intentionally introduced by mechanical ...
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Article
Enhanced thermoelectric properties in vacuum-annealed Bi0.5Sb1.5Te3 thin films fabricated using pulsed laser deposition
Symeou, E.; Nicolaou, Ch.; Kyratsi, Theodora; Giapintzakis, John (2019)Localized cooling in microelectronics and nanoelectronics as well as energy autonomy in applications such as wireless sensor networks and wearable electronics could be well served by thin-film thermoelectric devices ...
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Conference Object
Experimental and modeling evidence for the reduction of thermal conductivity in Mg2Si by fine tuning the nano & micro-structural features
Hatzikraniotis, E.; Polymeris, G. S.; Symeou, E.; Kyratsi, Theodora; Paraskevopoulos, K. M. (Elsevier Ltd, 2017)In this paper, experimental and modeling evidence for reduced thermal conductivity in Bi-doped Mg2Si is presented. Upon doping, lattice thermal conductivity was reduced monotonically and, at the same time, MgO content was ...
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Article
High thermoelectric performance of Bi2-xSbxTe3 bulk alloys prepared from non-nanostructured starting powders
Symeou, E.; Nicolaou, Ch.; Delimitis, A.; Androulakis, J.; Kyratsi, Theodora; Giapintzakis, John (2019)In this work, hot press and hot deformation were applied to p-type Bi2-xSbxTe3 (x = 1.5-1.8) starting powders that have not undergone nanostructuring processing. The effects of hot pressing and hot deformation, as well ...
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Article
Recycling Si-kerf from photovoltaics: A very promising route to thermoelectrics
Mesaritis, G.; Symeou, E.; Delimitis, A.; Oikonomidis, S.; Jaegle, M.; Tarantik, K.; Nicolaou, Ch.; Kyratsi, Theodora (2019)Large scale photovoltaic technology require Si wafers and cutting process has the significant disadvantage of disposing typically more than 50% of high purity material as waste kerf. Recycling silicon kerf is of increasing ...
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Article
Structural Characterization and Thermoelectric Properties of Hot-Pressed CoSi Nanocomposites
Ioannou, M.; Symeou, E.; Giapintzakis, John; Kyratsi, Theodora (2014)Fabrication of nanocomposites by introduction of SiO2 metal oxide nanoparticles into a cobalt silicide thermoelectric matrix is studied. The CoSi matrix material was prepared through solid-state synthesis, and the nano-SiO2 ...
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Article
Synthesis, crystal structure and thermoelectric properties of a new metal telluride Ba3Ag3InTe6
Lee, M.-Y.; Bilc, D. I.; Symeou, E.; Lin, Y.-C.; Liang, I.-C.; Kyratsi, Theodora; Hsu, K. F. (2017)A new metal telluride Ba3Ag3InTe6 was synthesized by a solid-state reaction at 650 °C. Crystal data: Orthorhombic, Cmc21, a = 4.5669(3) Å, b = 27.9366(16) Å, c = 13.3819(8) Å, V = 1707.3(2) Å3, and Z = 4. This compound ...
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Article
Thermoelectric properties of Bi0.5Sb1.5Te3 thin films grown by pulsed laser deposition
Symeou, E.; Pervolaraki, M.; Mihailescu, C. N.; Athanasopoulos, G. I.; Papageorgiou, C.; Kyratsi, Theodora; Giapintzakis, John (2015)We report on the pulsed laser deposition of p-type Bi0.5Sb1.5Te3 thin films onto fused silica substrates by ablation of dense targets of Bi0.5Sb1.5Te3 with an excess of 1 wt% Te. We investigated the effect of film thickness, ...
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Article
Transport properties of 3D printed polymer nanocomposites for potential thermoelectric applications
Viskadourakis, Z.; Perrakis, G.; Symeou, E.; Giapintzakis, John; Kenanakis, G. (2019)We report the transport and thermoelectric properties of three-dimensional printed samples, which are composed by polymer nanocomposites. For the purposes of the current study, the well-known fused deposition modeling ...