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  4. Influence of Coulombic broadened DX center energy levels on free electron concentration in delta-doped AlxGa1-xAs/GaAs quantum wells
 
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1994
Journal Article
Title

Influence of Coulombic broadened DX center energy levels on free electron concentration in delta-doped AlxGa1-xAs/GaAs quantum wells

Other Title
Einfluß von Coulomb verbreiterten DX-Zentren Energieniveaus auf die freie Elektronenkonzentration ins delta-dotierten AlxGa-xAs/GaAs Quantum Wells
Abstract
The achievable two-dimensional (2D) electron concentration in a delta-doped quantum well depends on the A] content in the doping layer and is considerably lower than the nominal doping concentration. This behavior has been so far attributed to different incorporation probabilities of Si atoms depending upon the AI content. In this work, we show instead that the energy levels of the DX center together with the Coulomb interaction account for this behavior. We present calculations of the DX center density of states which are broadened by the Coulomb interaction and show that the estimated 2D) carrier concentrations agree well with experiment.
Author(s)
Brunthaler, G.
Seto, M.
Stöger, G.
Köhler, Klaus  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Journal
Applied Physics Letters  
DOI
10.1063/1.112989
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • DX center

  • DX-Zentrum

  • electrical measurement

  • elektrische Messung

  • III-V Halbleiter

  • III-V semiconductors

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