Browsing by Author "Tsokkou, Demetra"
Now showing items 1-17 of 17
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Article
Carrier dynamics and conductivity of SnO 2 nanowires investigated by time-resolved terahertz spectroscopy
Tsokkou, Demetra; Othonos, Andreas S.; Zervos, Matthew (2012)THz spectroscopy has been applied to investigate the photo-induced and intrinsic conductivity in SnO 2 nanowires using the Drude-Smith model. The refractive index of the nanowires was found to decrease from 2.4 to 2.1 with ...
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Article
Concentration and excitation effects on the exciton dynamics of poly(3-hexylthiophene)/PbS quantum dot blend films
Tsokkou, Demetra; Itskos, Grigorios; Choulis, Stelios A.; Yarema, M.; Heiss, W.; Othonos, Andreas S. (2013)The dynamics of photoexcitations in hybrid blends of poly(3-hexylthiophene) (P3HT) conjugated polymer donor and oleic-acid capped lead sulfide (PbS) quantum dot (QD) acceptors of different concentrations - for light ...
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Article
Defect states of chemical vapor deposition grown GaN nanowires: Effects and mechanisms in the relaxation of carriers
Tsokkou, Demetra; Othonos, Andreas S.; Zervos, Matthew (2009)Carrier relaxation in GaN nanowires, grown by atmospheric pressure chemical vapor deposition, via direct nitridation of Ga with NH3 at 950 °C has been investigated in detail. Differential absorption measurements reveal a ...
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Article
Erratum: Tetraphenylhexaazaanthracenes: 16π Weakly Antiaromatic Species with Singlet Ground States (Org. Lett. (2015) 17 (4026-4029) DOI: 10.1021/acs.orglett.5b01923)
Constantinides, Christos P.; Zissimou, Georgia A.; Berezin, Andrey A.; Ioannou, Theodosia A.; Manoli, Maria; Tsokkou, Demetra; Theodorou, E.; Hayes, Sophia C.; Koutentis, Panayiotis Andreas (2016)
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Article
Femtosecond carrier dynamics in In 2O 3 nanocrystals
Othonos, Andreas S.; Zervos, Matthew; Tsokkou, Demetra (2009)We have studied carrier dynamics in In 2O 3 nanocrystals grown on a quartz substrate using chemical vapor deposition. Transient differential absorption measurements have been employed to investigate the relaxation dynamics ...
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Article
Low temperature growth of In 2O 3 and InN nanocrystals on Si(111) via chemical vapour deposition based on the sublimation of NH 4Cl in In
Zervos, Matthew; Tsokkou, Demetra; Pervolaraki, Maria; Othonos, Andreas S. (2009)Indium oxide (In 2O 3) nanocrystals (NCs) have been obtained via atmospheric pressure, chemical vapour deposition (APCVD) on Si(111) via the direct oxidation of In with Ar:10% O 2 at 1000 °C but also at temperatures as low ...
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Conference Object
Optical response of II-VI ZnSe nanowires
Ruda, H. E.; Philipose, U.; Saxena, A.; De Souza, C.; Nair, S.; Salfi, J.; Shik, A.; Othonos, Andreas S.; Lioudakis, Emmanouil E.; Tsokkou, Demetra; Zhong, L.; Fernandes, C. (2010)II-VI nanowires offer a unique combination of properties for developing blue/UV optoelectronic devices. Key to realizing this potential is managing the nanowire growth process to ensure appropriate properties are realized. ...
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Article
Photophysics of PbS Quantum Dot Films Capped with Arsenic Sulfide Ligands
Tsokkou, Demetra; Papagiorgis, Paris; Protesescu, Loredana; Kovalenko, Maksym V.; Choulis, Stelios A.; Christofides, Constantinos; Itskos, Grigorios; Othonos, Andreas S. (2014)PbS quantum dots (QDs) of different sizes capped with short (NH4)(3)AsS3 inorganic ligands are produced via ligand exchange processes from oleate-capped PbS QDs. The solid-state photophysical properties of the control ...
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Article
Size-dependent charge transfer in blends of Pbs quantum dots with a low-gap silicon-bridged copolymer
Itskos, Grigorios; Papagiorgis, Panagiotis; Tsokkou, Demetra; Othonos, Andreas S.; Hermerschmidt, F.; Economopoulos, Solon P.; Yarema, M.; Heiss, W.; Choulis, Stelios A. (2013)The photophysics of bulk heterojunctions of a high-performance, low-gap silicon-bridged dithiophene polymer with oleic acid capped PbS quantum dots (QDs) are studied to assess the material potential for light harvesting ...
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Article
Size‐Dependent Charge Transfer in Blends of PbS Quantum Dots with a Low‐Gap Silicon‐Bridged Copolymer
Itskos, Grigorios; Papagiorgis, Paris; Tsokkou, Demetra; Othonos, Andreas S.; Hermerschmidt, Felix; Economopoulos, Solon P.; Yarema, Maksym; Heiss, Wolfgang; Choulis, Stelios A. (2013)
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Article
Structural properties of SnO2 nanowires and the effect of donor like defects on its charge distribution
Zervos, Matthew; Othonos, Andreas S.; Tsokkou, Demetra; Kioseoglou, J.; Pavlidou, E.; Komninou, P. (2013)Tin oxide (SnO2) nanowires (NWs) with diameters of 50 nm, lengths up to 100 μm and a tetragonal rutile crystal structure have been grown by low pressure reactive vapour transport on 1 nm Au/Si(001). The free carrier density ...
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Article
Structural properties of SnO2 nanowires and the effect of donor like defects on its charge distribution
Zervos, Matthew; Othonos, Andreas S.; Tsokkou, Demetra; Kioseoglou, J.; Pavlidou, E.; Komninou, P. (2012)
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Article
Tetraphenylhexaazaanthracenes: 16π Weakly Antiaromatic Species with Singlet Ground States
Constantinides, Christos P.; Zissimou, Georgia A.; Berezin, Andrey A.; Ioannou, Theodosia A.; Manoli, Maria; Tsokkou, Demetra; Theodorou, E.; Hayes, Sophia C.; Koutentis, Panayiotis Andreas (2015)Tetraphenylhexaazaanthracene, TPHA-1, is a fluorescent zwitterionic biscyanine with a closed-shell singlet ground state. TPHA-1 overcomes its weak 16π antiaromaticity by partitioning its π system into 6π positive and 10π ...
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Article
Tin oxide nanowires: The influence of trap states on ultrafast carrier relaxation
Othonos, Andreas S.; Zervos, Matthew; Tsokkou, Demetra (2009)We have studied the optical properties and carrier dynamics in SnO 2 nanowires (NWs) with an average radius of 50 nm that were grown via the vapor-liquid solid method. Transient differential absorption measurements have ...
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Doctoral Thesis Open Access
Ultrafast carrier dynamics and transport properties in semiconducting nanowires
Tsokkou, Demetra (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2012-06)Τα ημιαγωγικά νανονήματα παρέχουν εξαιρετικές προοπτικές για μελλοντική τους εφαρμογή σε οπτοηλεκτρονικές συσκευές και αισθητήρες αερίων, κυρίως λόγω των ηλεκτρονικών και οπτικών τους ιδιοτήτων. Για να γίνει εφικτή η ...
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Article
Ultrafast time-resolved spectroscopy of In2 O3 nanowires
Tsokkou, Demetra; Othonos, Andreas S.; Zervos, Matthew (2009)Ultrafast carrier dynamics in In2 O3 nanowires with an average diameter of ≈100±20 nm grown by the vapor-liquid-solid method have been investigated in detail using differential absorption spectroscopy with femtosecond ...
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Article
Ultrafast time-resolved spectroscopy of ZnSe nanowires: Carrier dynamics of defect-related states
Othonos, Andreas S.; Lioudakis, Emmanouil E.; Tsokkou, Demetra; Philipose, U.; Ruda, H. E. (2009)In recent years, ZnSe nanowires have been widely investigated for their potential applications in optoelectronics. A typical room temperature photoluminescence spectrum of ZnSe nanowires grown by vapor-liquid-solid growth ...