Browsing by Author "Itskos, Grigorios"
Now showing items 1-20 of 55
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Article
2-(2,3,4,5,6-Pentafluorophenyl)-1H-benzo[d]imidazole, a fluorine-rich building block for the preparation of conjugated polymer donors for organic solar cell applications
Neophytou, Marios; Ioannidou, Heraklidia A.; Ioannou, Theodosia A.; Chochos, Christos L.; Economopoulos, Solon P.; Koutentis, Panayiotis Andreas; Itskos, Grigorios; Choulis, Stelios A. (2012)We have introduced the pentafluorophenyl substituted benzimidazole as a building block of conjugated polymers for optoelectronic applications. We present the synthesis of a copolymer bearing fluorene as the comonomer. A ...
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Article
4H-1,2,6-Thiadiazin-4-one-containing small molecule donors and additive effects on their performance in solution-processed organic solar cells
Hermerschmidt, F.; Kalogirou, Andreas S.; Min, J.; Zissimou, Georgia A.; Tuladhar, S. M.; Ameri, T.; Faber, H.; Itskos, Grigorios; Choulis, Stelios A.; Anthopoulos, T. D.; Bradley, D. D. C.; Nelson, J.; Brabec, C. J.; Koutentis, Panayiotis Andreas (2015)The optical, electrochemical, morphological and transport properties of a series of thiadiazinone (acceptor) and (thienyl)carbazoles (donor) containing π-extended donor-acceptor-donors (D-A-D) are presented. Systematic ...
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Article
Analysis of the transport process providing spin injection through an Fe/AlGaAs Schottky barrier
Hanbicki, A. T.; Van't Erve, O. M. J.; Magno, R.; Kioseoglou, G.; Li, C. H.; Jonker, B. T.; Itskos, Grigorios; Mallory, R.; Yasar, M.; Petrou, Athos Chariton (2003)Electrical injection through a reverse biased Fe/AlGaAs Schottky contact was used to obtain electron-spin polarizations in a GaAs quantum well. The analysis of the transport data using the Rowell criteria shows that ...
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Article
A comparative study on phyllosilicate and tectosilicate mineral structural properties
Stylianou, Marinos; Inglezakis, Vassilis; Agapiou, Agapios; Itskos, Grigorios; Jetybayeva, Albina; Loizidou, Maria (2018)Natural minerals are widely used in numerous environmental applications, mainly as sorbents in ion exchange and sorption processes. Minerals, such as zeolites and clays, can be found all over the world, but they are mined ...
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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
Effects of the heteroepitaxial interface on spin injection in Fe/AlGaAs
Zega, T. J.; Stroud, R. M.; Hanbicki, A. T.; Kioseoglou, G.; Van't Erve, O. M. J.; Li, C. H.; Jonker, B. T.; Itskos, Grigorios; Mallory, R.; Yasar, M.; Petrou, Athos Chariton (2004)
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Article
Efficient dipole-dipole coupling of Mott-Wannier and Frenkel excitons in (Ga,In)N quantum well/polyfluorene semiconductor heterostructures
Itskos, Grigorios; Heliotis, G.; Lagoudakis, P. G.; Lupton, J.; Barradas, N. P.; Alves, E.; Pereira, S.; Watson, I. M.; Dawson, M. D.; Feldmann, J.; Murray, R.; Bradley, D. D. C. (2007)We investigate interactions between Mott-Wannier (MW) and Frenkel excitons in a family of hybrid structures consisting of thin organic (polyfluorene) films placed in close proximity (systematically adjusted by GaN cap layer ...
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Efficient electrical spin injection from a magnetic metal/tunnel barrier contact into a semiconductor
Hanbicki, A. T.; Jonker, B. T.; Itskos, Grigorios; Kioseoglou, G.; Petrou, Athos Chariton (2002)We report electrical spin injection from a ferromagnetic metal contact into a semiconductor light emitting diode structure with an injection efficiency of 30% which persists to room temperature. The Schottky barrier formed ...
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Conference Object
Efficient förster transfer mediated by excitons in InGaN/GaN quantum well/polyfluorene heterostructures
Itskos, Grigorios; Heliotis, G.; Belton, C.; Watson, I. M.; Dawson, M. D.; Bradley, D. D. C.; Murray, R. (2007)We report on novel InGaN/GaN quantum well/polyfluorene heterostructures where efficient Förster energy transfer from the well to the organic layer occurs. We show that Mott-Wannier excitons dominate the quantum well ...
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Article
Electrical spin injection across air-exposed epitaxially regrown semiconductor interfaces
Park, Y. D.; Jonker, B. T.; Bennett, B. R.; Itskos, Grigorios; Furis, M.; Kioseoglou, G.; Petrou, Athos Chariton (2000)We have fabricated spin-polarized light-emitting diode structures via epitaxial regrowth of Znl-xMnxSe on air-exposed surfaces of AlyGal-yAs/GaAs quantum wells. No passivation procedures were used to protect or prepare the ...
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Conference Object
Electrical spin injection and band offsets in an n-type ferromagnetic semiconductor heterostructure: n-CdCr2Se4 / AlGaAs / GaAs
Jonker, B. T.; Hanbicki, A. T.; Kioseoglou, G.; Li, C. H.; Stroud, R. M.; Sullivan, J. M.; Erwin, S. C.; Lüpke, G.; Zhao, H. B.; Ren, Y. H.; Sun, B.; Itskos, Grigorios; Mallory, R.; Yasar, M.; Petrou, Athos Chariton (2003)The electrical spin injection and band offsets in an n-type ferromagnetic semiconductor heterostructure were discussed. The electrical spin injection from spin-LED structures showed defect-dominated electroluminescence. ...
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Conference Object
Electrical spin injection and band offsets in an n-type ferromagnetic semiconductor heterostructure: n-CdCr2Se4/AlGaAs/GaAs
Jonker, B. T.; Hanbicki, A. T.; Kioseoglou, G.; Li, C. H.; Stroud, R. M.; Sullivan, J. M.; Erwin, S. C.; Lüpke, G.; Zhao, H. B.; Ren, Y. H.; Sun, B.; Itskos, Grigorios; Mallory, R.; Yasar, M.; Petrou, Athos Chariton (Institute of Electrical and Electronics Engineers Inc., 2003)Electrical spin injection and band offsets in an n-type ferromagnetic semiconductor heterostructure of CdCr2Se4-AlGaAs-GaAs are studied. Epitaxially grown CdCr2Se4 films exhibit hysteresis behavior with significant remanence, ...
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Conference Object
Electrical spin injection from a magnetic schottky tunnel contact into a semiconductor
Jonker, B. T.; Hanbicki, A. T.; Itskos, Grigorios; Kioseoglou, G.; Petrou, Athos Chariton (2002)A report on the electrical spin injection from a magnetic Schottky tunnel contact into a semiconductor was presented. The temperature dependence of the optical polarization and corresponding spin injection efficiency was ...
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Article
Electronic and interface properties of polyfluorene films on GaN for hybrid optoelectronic applications
Itskos, Grigorios; Xristodoulou, X.; Iliopoulos, Eleftherios; Ladas, Spyridon; Kennou, Styliani; Neophytou, Marios; Choulis, Stelios A. (2013)Electronic and interface properties of spin-coated poly(9,9- dioctylfluorenyl-2,7-diyl) (PFO) films on GaN have been investigated in terms of their potential for optoelectronic applications. The PFO/GaN interface was studied ...
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Conference Object
Electrospun fibers based on P3HT
Ioannides, Maria-Lydia; Lambride, Chryso; Papaparaskeva, Georgia; Papagiorgis, Paris; Manoli, Andreas; Itskos, Grigorios; Krasia-Christoforou, Theodora (2019)
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Article
Emission from the stable Blatter radical
Karecla, G.; Papagiorgis, Panagiotis; Panagi, N.; Zissimou, Georgia A.; Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Itskos, Grigorios; Hayes, Sophia C. (2017)1,3-Diaryl-1,4-dihydro-1,2,4-benzotriazin-4-yls are air stable organic radicals which have been exploited for their interesting magnetic properties. Herein, we present the optical properties of the "parent" radical namely ...
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Article
Emission from the stable Blatter radicalAAA
Karecla, G.; Papagiorgis, Panagiotis; Panagi, N.; Zissimou, Georgia A.; Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Itskos, Grigorios; Hayes, Sophia C. (2017)1,3-Diaryl-1,4-dihydro-1,2,4-benzotriazin-4-yls are air stable organic radicals which have been exploited for their interesting magnetic properties. Herein, we present the optical properties of the "parent" radical namely ...
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Article
Equilibrium ion exchange studies of Zn2+, Cr3+, and Mn2+ on natural bentonite
Stylianou, Marinos A.; Inglezakis, Vassilis J.; Loizidou, Maria D.; Agapiou, Agapios; Itskos, Grigorios (2016)Bentonite is a clay mineral often used in ion exchange processes due to its high ion exchange capacity. In the present study, a commercially available in Greece market bentonite was obtained and characterized by XRD, XRF, ...
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Article
Erratum: Efficient dipole-dipole coupling of Mott-Wannier and Frenkel excitons in (Ga,In)N quantum well/polyfluorene semiconductor heterostructures (Physical Review B - Condensed Matter and Materials Physics (2007) 76, (035344))
Itskos, Grigorios; Heliotis, G.; Lagoudakis, P. G.; Lupton, J.; Barradas, N. P.; Alves, E.; Pereira, S.; Watson, I. M.; Dawson, M. D.; Feldmann, J.; Murray, R.; Bradley, D. D. C. (2008)
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Article
Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes
Othonos, Andreas S.; Itskos, Grigorios; Neophytou, Marios; Choulis, Stelios A. (2012)We report on excitation dynamics in pristine and bulk heterojunction films of the low bandgap silicon-bridged dithiophene copolymer poly[(4,4′-bis(2- ethylhexyl)dithieno[3,2-b:2′, 3′-d]silole)-2,6-diyl-alt-(4,7-bis(2- ...