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Applied Physics A

, Volume 56, Issue 5, pp 445–448 | Cite as

Two-dimensional electron-hole pair diffusivities in thin GaAs/AlGaAs Quantum Wells

  • H. Hillmer
  • C. W. Tu
Surfaces And Multilayers

Abstract

Diffusivities of two-dimensional electron-hole pairs in thin GaAs/AlGaAs Quantum Wells (QWs) are studied experimentally and theoretically as functions of temperature and well-width. With growing well-widths, increasing diffusivities are observed for fixed Al-contents. Experimental diffusivities for the lateral carrier motion in continuously as well as in interrupted-grown thin QWs of different barrier Al-content are presented for T>150 K. Increasing diffusivities are observed for rising temperatures in the range T≳190 K. A comparison of the experimental data and results of theoretical model calculations indicates that the increase is partly related to thermal dissociation of excitons into free carrier pairs. The effective diffusivity of this two-component system is calculated using a system of rate equations and considering acoustic-deformation-potential scattering, polar-optical scattering and barrier-alloy-disorder scattering.

PACS

73.50.Bk 73.20.Mf 73.20.Dx 73.60.Br 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • H. Hillmer
    • 1
  • C. W. Tu
    • 2
  1. 1.Forschungs- und TechnologiezentrumDeutsche Bundespost TelekomDarmstadtGermany
  2. 2.AT & T Bell LaboratoriesMurray HillUSA

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