Browsing by Author "Kucheyev Sergei"

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Browsing by Author "Kucheyev Sergei"

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  • Cathodoluminescence Efficiency Dependence on Excitation Density in n-Type Gallium Nitride 
    Phillips Matthew; Telg Hagen; Kucheyev Sergei; Gelhausen Olaf; Toth Milos (Cambridge University Press, 2003)
    Cathodoluminescence (CL) spectra from silicon doped and undoped wurtzite n-type GaN have been measured in a SEM under a wide range of electron beam excitation conditions, which include accelerating voltage, beam current, ...
  • Cathodoluminescnece Depth Profiling of Ion-Implanted GaN 
    Phillips Matthew; Kucheyev Sergei; Williams Jim; Toth Milos; Jagadish Chennupati; Li Gang (American Institute of Physics, 2001)
    Cathodoluminescence (CL) spectroscopy shows that even relatively low-dose keY light-ion bombardment (corresponding to the generation of ~ 5 X 1019 vacancies/crrr') of wurtzite GaN results in a dramatic quenching of visible ...
  • Chemical origin of the yellow luminescence in GaN 
    Kucheyev Sergei; Toth Milos; Phillips Matthew; Williams Jim; Jagadish Chennupati; Li Gang (American Institute of Physics, 2002)
    The influence of ion-beam-produced lattice defects as well as H, B, C, N, O, and Si, introduced by ion implantation, on the luminescence properties of wurtzite GaN is studied by cathodoluminescence spectroscopy. Results ...
  • Contactinduced defect propagation in ZnO 
    Bradby Jodie; Kucheyev Sergei; Williams Jim; Jagadish Chennupati; Swain Michael; Munroe Paul; Phillips Matthew (American Institute of Physics, 2002)
    Contact-induced damage has been studied in single-crystal (wurtzite) ZnO by cross-sectional transmission electron microscopy (XTEM) and scanning cathodoluminescence (CL) monochromatic imaging. XTEM reveals that the prime ...
  • Effects of Excitation Density on Cathodoluminescence from GaN 
    Phillips Matthew; Kucheyev Sergei; Williams Jim; Toth Milos; Jagadish Chennupati; Li Gang (American Institute of Physics, 2001)
    Wurtzite GaN epilayers are studied by cathodoluminescence (CL) spectroscopy. Results show that the intensities of donor-acceptor pair (DAP) and yellow luminescence (YL) peaks sublinearly depend on excitation density, ...
  • Structure of low-density nanoporous dielectrics revealed by low-vacuum electron microscopy and small-angle X-ray scattering 
    Kucheyev Sergei; Toth Milos; Baumann T F; Hamza A V; Ilavsky K; Knowles William; Saw C K; Thiel Bradley; Tileli V; Van Buuren T; Wang Y M; Willey T M (Amer Chemical Soc, 2007)
    Aerogels (AGs) are ultralow-density nanoporous solids that have numerous potential applications. However, as most AGs are strong insulators with poor mechanical properties, direct studies of the complex nanoporous structure ...
  • X-ray spectrometry investigation of electrical isolation in GaN 
    Kucheyev Sergei; Toth Milos; Phillips Matthew; Williams Jim; Jagadish Chennupati; Li Gang (American Institute of Physics, 2002)
    Electrical isolation of n-type GaN epilayers bombarded with MeV light ions is studied by energy dispersive x-ray spectrometry (EDS). We show that the maximum bremsstrahlung x-ray energy (the Duane–Hunt limit) can be used ...