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  4. Band-gap renormalization and band filling in Si-doped GaN films studied by photoluminescence spectroscopy
 
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1999
Journal Article
Title

Band-gap renormalization and band filling in Si-doped GaN films studied by photoluminescence spectroscopy

Other Title
Bandlückennormalisierung und Bandauffüllung in Si-dotierten GaN-Filmen untersucht mittels Photolumineszenzspektroskopie
Abstract
We have studied band-gap renormalization and band filling in Si-doped GaN films with free-electron concentrations up to 1.7 x 10(exp19) cm(-3) , using temperature-dependent photoluminescence (PL) spectroscopy. The low-temperature (2 K) PL spectra showed a line-shape characteristic for momentum nonconserving band-to-band recombination. The energy downshift of the low-energy edge of the PL line with increasing electron concentration n, which is attributed to band-gap renormalization (BGR) effects, could be fitted by a n(1/3) power law with a BGR coefficient of - 4.7 X 10(exp-8) eV cm. The peak energy of the room-temperature band-to-band photoluminescence spectrum was found to decrease as the carrier concentration increases up to about 7 X 10(exp18) cm(-3) followed by a high-energy shift upon further increasing carrier concentration, due to the interplay between the BGR effects and band filling. The room-temperature PL linewidth showed a monotonic increase with carrier concentration, whic h could be described by a n(2/3) power-law dependence.
Author(s)
Yoshikawa, M.
Kunzer, Michael  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Wagner, J.
Obloh, H.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Schlotter, P.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Schmidt, Ralf
Herres, N.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Kaufmann, U.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Journal
Journal of applied physics  
DOI
10.1063/1.371377
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • band-gap renormalization

  • Bandlückenrenormalisierung

  • GaN

  • photoluminescence

  • Photolumineszenz

  • Si doping

  • Si-Dotierung

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