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Browsing by Subject "Excitons"

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    • Article  

      Comparative study of perturbative methods for computing electron transfer tunneling matrix elements with a nonorthogonal basis set 

      Teklos, A.; Skourtis, Spiros S. (2006)
      The authors consider the problem of computing tunneling matrix elements for bridge-mediated electron transfer reactions using the Löwdin [J. Math. Phys. 3, 969 (1962)

    • 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 ...

    • 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 ...

    • 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- ...

    • Article  

      Exciton in an Aharonov-Bohm ring: An exactly soluble interacting mesoscopic system 

      Moulopoulos, Konstantinos; Constantinou, Martha G. (2006)
      A Green's function procedure leads to an exact determination of the energy spectrum and the associated eigenstates of a system of two oppositely charged particles interacting through a contact potential and moving in a ...

    • Article  

      Exciton-donor complexes in semiconductor quantum dots in a magnetic field: Infinite and finite potential barriers 

      Avetisyan, A.; Djotyan, Anahit P.; Kazaryan, E.; Moulopoulos, Konstantinos (2008)
      The binding energy of the ground state of a charged exciton-donor complex in a spherical semiconductor quantum dot with infinite and finite potential barriers as well as the oscillator strength for the optical transition ...

    • Article  

      Hybrid polaritons in strongly coupled microcavities: Experiments and models 

      Lidzey, D. G.; Wenus, J.; Whittaker, D. M.; Itskos, Grigorios; Stavrinou, P. N.; Bradley, D. D. C.; Murray, R. (2004)
      We describe the fabrication of one-dimensional quantum microcavities containing two different layers of molecular J-aggregates. We show that strong coupling can occur between the confined cavity photon mode and the two ...

    • Article  

      Linear dynamic polarizability and the absorption spectrum of an exciton in a quantum ring in a magnetic field 

      Ghazaryan, A. V.; Djotyan, Anahit P.; Moulopoulos, Konstantinos; Kirakosyan, Albert A. (2011)
      The problem of an electron-hole system interacting through a contact potential and moving in a one-dimensional quantum ring threaded by an Aharonov-Bohm flux is considered, with respect to the system's energetics as well ...

    • Article  

      Multiscale modelling of solid tumour growth: the effect of collagen micromechanics 

      Wijeratne, P. A.; Vavourakis, V.; Hipwell, J. H.; Voutouri, C.; Papageorgis, P.; Stylianopoulos, T.; Evans, A.; Hawkes, D. J. (2016)
      Here we introduce a model of solid tumour growth coupled with a multiscale biomechanical description of the tumour microenvironment, which facilitates the explicit simulation of fibre–fibre and tumour–fibre interactions. ...

    • Article  

      Optical properties of conjugated poly(3-hexylthiophene)/ [6,6] -phenyl C61 -butyric acid methyl ester composites 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Alexandrou, Ioannis; Hayashi, Y. (2007)
      In this work, we present the evolution of optical constants as a function of [6,6] -phenyl C61 -butyric acid methyl ester (PCBM) concentration for conjugated poly(3-hexylthiophene)/ [6,6] -phenyl C61 -butyric acid methyl ...

    • Article  

      Optical properties of organic semiconductor blends with near-infrared quantum-dot sensitizers for light harvesting applications 

      Itskos, Grigorios; Othonos, Andreas S.; Rauch, T.; Tedde, S. F.; Hayden, O.; Kovalenko, M. V.; Heiss, W.; Choulis, Stelios A. (2011)
      We report an optical investigation of conjugated polymer (P3HT)/fullerene (PCBM) semiconductor blends sensitized by near-infrared absorbing quantum dots (PbS QDs). A systematic series of samples that include pristine, ...

    • Article  

      Optical spin injection in CuGaSe2/GaAs films 

      Itskos, Grigorios; Murray, R.; Meeder, A.; Papathanasiou, Niklas; Lux-Steiner, M. Ch (2006)
      We have investigated polarization-resolved photoluminescence in epitaxially grown CuGaSe2/GaAs(001) films. Spin-polarized excitons are optically excited both below and above the characteristic crystal field splitting of ...

    • 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 ...

    • Article  

      Triplet excitation energy dynamics in metal-organic frameworks 

      Lin, J.; Hu, X.; Zhang, P.; Van Rynbach, A.; Beratan, David N.; Kent, C. A.; Mehl, B. P.; Papanikolas, J. M.; Meyer, T. J.; Lin, W.; Skourtis, Spiros S.; Constantinou, Martha G. (2013)
      Metal-organic frameworks (MOFs) are appealing candidates for use in energy harvesting and concentrating because of their high chromophore density and structural tunability. The ability to engineer electronic excitation ...

    • Article  

      Ultrafast carrier dynamics on conjugated poly(3-hexylthiophene)/[6,6]- phenyl C61 -butyric acid methyl ester composites 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Alexandrou, Ioannis; Hayashi, Y. (2007)
      The authors have studied ultrafast carrier dynamics on poly(3- hexylthiophene)/[6,6]- phenyl C61 -butyric acid methyl ester (PCBM) composites up to 50% PCBM concentration. They have resolved the exciton intraband relaxation ...

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