Browsing Τμήμα Φυσικής / Department of Physics by Subject "Absorption"
Now showing items 1-17 of 17
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Carrier dynamics in InS nanowires grown via chemical vapor deposition
(2010)Transient femtosecond absorption spectroscopy and timecorrelating single photon counting (TCSPC) photoluminescence (PL) were employed to study InS nanowires (NWs) grown by chemical vapor deposition (CVD) and determine the ...
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Carrier relaxation dynamics in SnxNy nanowires grown by chemical vapor deposition
(2009)Carrier relaxation dynamics in tin nitride (SnxNy) nanowires have been investigated using femtosecond transient absorption spectroscopy. The nanowires were grown directly on quartz using chemical vapor deposition and had ...
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Article
Defect states of chemical vapor deposition grown GaN nanowires: Effects and mechanisms in the relaxation of carriers
(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
Direct observation of excitons in polymer/carbon nanotube composites at room temperature: The influence of nanotube concentration
(2008)In this work, we have employed spectroscopic ellipsometry technique to study the optical properties of polymer/carbon nanotube (CN) composites as a function of nanotube concentration. Using a two-layer structural model ...
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Femtosecond carrier dynamics in In 2O 3 nanocrystals
(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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Femtosecond dynamics in single wall carbon nanotube/poly(3-hexylthiophene) composites
(2008)Femtosecond transient absorption measurements on single wall carbon nanotube/poly(3-hexylthiophene) composites are used to investigate the relaxation dynamics of this blended material. The influence of the addition of ...
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Article
Hybrid inorganic/organic semiconductor heterostructures with efficient non-radiative energy transfer
(2006)A hybrid inorganic/organic semiconductor structure employing a polyfluorene thin films with Efficient non-radiative Förster resonant energy transfer (FRET) was fabricated. FRET is mediated by dipole-dipole interactions, ...
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Linear dynamic polarizability and the absorption spectrum of an exciton in a quantum ring in a magnetic field
(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 ...
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Monitoring charge exchange in P3HT-nanotube composites using optical and electrical characterisation
(2009)Charge exchange at the bulk heterojunctions of composites made by mixing single wall nanotubes (SWNTs) and polymers show potential for use in optoelectronic devices such as solar cells and optical sensors. The density/total ...
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Article
Search for Bs 0 → μ+μ - and Bd 0 → μ+μ - decays in pp̄ collisions at √s = 1.96 TeV
(2004)The decay mechanisms of Bs 0 → μ +μ- and Bd 0 → μ +μ- in pp̄ collisions were investigated. For discrimination of the decays from background events, four variables were used such as invariant mass of muon pair, B-candidate ...
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Surface-related states in oxidized silicon nanocrystals enhance carrier relaxation and inhibit auger recombination
(2008)We have studied ultrafast carrier dynamics in oxidized silicon nanocrystals (NCs) and the role that surface-related states play in the various relaxation mechanisms over a broad range of photon excitation energy corresponding ...
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Tin oxide nanowires: The influence of trap states on ultrafast carrier relaxation
(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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Article
Transient photoinduced absorption in ultrathin as-grown nanocrystalline silicon films
(2008)We have studied ultrafast carrier dynamics in nanocrystalline silicon films with thickness of a few nanometers where boundary-related states and quantum confinement play an important role. Transient non-degenerated ...
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Ultrafast carrier dynamics in band edge and broad deep defect emission ZnSe nanowires
(2007)Ultrafast carrier dynamics of ZnSe nanowires grown under different growth conditions have been studied. Transient absorption measurements reveal the dependence of the competing effects of state filling and photoinduced ...
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Ultrafast carrier relaxation in inn nanowires grown by reactive vapor transport
(2009)We have studied femtosecond carrier dynamics in InN nanowires grown by reactive vapor transport. Transient differential absorption measurements have been employed to investigate the relaxation dynamics of photogenerated ...
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Ultrafast time-resolved spectroscopy of Si nanocrystals embedded in SiO2 matrix
(2009)In this work, we present a comprehensive study of ultrafast transient photoinduced absorption of silicon nanocrystals (NCs) embedded in SiO2 matrix. The samples under investigation are single monolayers of Si-NCs embedded ...
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Ultrafast time-resolved spectroscopy of ZnSe nanowires: Carrier dynamics of defect-related states
(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 ...