Γ-X electron transfer in type II tunneling bi-quantum wells

Atsushi Tackeuchi, Uwe Strauß, Wolfgang W. Rühle, Tsuguo Inata, Shunichi Muto

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have studied the energy band structure and the Γ-X carrier transfer mechanism for type II tunneling bi-quantum wells consisting of GaAs wells, AlGaAs barriers of different thicknesses, and AlAs layers by cw and time-resolved photoluminescence measurements. The cw photoluminescence spectra of the indirect recombination of X electrons in the 7.1 nm thick AlAs layers with Γ holes in the 2.8 nm thick GaAs wells show weak zero-phonon lines indicating that the AlAs confined states at Xxy are lower than those at Yz. Time-resolved photoluminescence reveals that the carrier transfer time depends stronger on temperature for thicker AlGaAs barriers. Two scattering mechanisms, temperature-dependent phonon scattering and the temperature-independent interface scattering, are probably involved in the carrier transfer, the latter becoming smaller with increasing AlGaAs barrier thickness. Our results are compared with those obtained for similar type II GaAs/AlAs superlattices.

Original languageEnglish
Pages (from-to)809-812
Number of pages4
JournalSolid State Electronics
Volume37
Issue number4-6
DOIs
Publication statusPublished - 1994 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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