Browsing by Author "Frangis, N."
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Article
Influence of grain size on ultrafast carrier dynamics in thin nanocrystalline silicon films
Lioudakis, Emmanouil E.; Othonos, Andreas S.; Nassiopoulou, Androula Galiouna; Lioutas, Ch B.; Frangis, N. (2007)The ultrafast carrier dynamics in thin nanocrystalline silicon films (10 and 20 nm thick) on quartz over a broad spectral range using optical pumping at a moderate fluence of 2.5 mJ cm2 were studied. The films were composed ...
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Article
The role of surface vibrations and quantum confinement effect to the optical properties of very thin nanocrystalline silicon films
Lioudakis, Emmanouil E.; Antoniou, Antreas; Othonos, Andreas S.; Christofides, Constantinos; Nassiopoulou, Androula Galiouna; Lioutas, Ch B.; Frangis, N. (2007)We report on a spectroscopic study of very thin nanocrystalline silicon films varying between 5 and 30 nm. The role of quantum confinement effect and surface passivation of nanograins in optical properties are examined in ...
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Article
Thermoelectric properties of nanocrystalline PbTe synthesized by mechanical alloying
Papageorgiou, Ch; Hatzikraniotis, E.; Lioutas, Ch B.; Frangis, N.; Valassiades, O.; Paraskevopoulos, K. M.; Kyratsi, Theodora (2010)In this work, nanocrystalline lead telluride powder was synthesized from high-purity elements by mechanical alloying by means of a planetary ball-milling procedure. The milling medium was tungsten carbide, and the diameter ...