Quasibound states in type-II ZnTe/CdSe superlattices studied by modulation spectroscopies and photoconductivity at room temperature

S. M. Tseng, Y. F. Chen, Y. T. Cheng, C. W. Hsu, Y. S. Huang, Der-Yuh Lin

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We report that the quasibound states at the above-barrier region in type-II ZnTe/CdSe superlattices can be clearly observed at room temperature by photoreflectance, contactless electroreflectance, as well as photoconductivity measurements. We provide concrete evidence to confirm that free-carrier confinement at barrier layer (either in the valence-band CdSe layer or in the conduction-band ZnTe layer) does exist. It is found that the barrier-width dependence of the above-barrier ground-state transition energies can be described well by the constructive interference condition. We also observe the absorptive spatially indirect transition between electrons confined in the CdSe and holes confined in the ZnTe layers.

Original languageEnglish
Article number195311
Pages (from-to)1953111-1953115
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number19
Publication statusPublished - 2001 Nov 15

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Photoconductivity
Superlattices
Electron transitions
photoconductivity
superlattices
Modulation
Spectroscopy
modulation
room temperature
Valence bands
Conduction bands
Ground state
spectroscopy
barrier layers
Temperature
conduction bands
valence
interference
ground state
electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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Quasibound states in type-II ZnTe/CdSe superlattices studied by modulation spectroscopies and photoconductivity at room temperature. / Tseng, S. M.; Chen, Y. F.; Cheng, Y. T.; Hsu, C. W.; Huang, Y. S.; Lin, Der-Yuh.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 19, 195311, 15.11.2001, p. 1953111-1953115.

Research output: Contribution to journalArticle

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T1 - Quasibound states in type-II ZnTe/CdSe superlattices studied by modulation spectroscopies and photoconductivity at room temperature

AU - Tseng, S. M.

AU - Chen, Y. F.

AU - Cheng, Y. T.

AU - Hsu, C. W.

AU - Huang, Y. S.

AU - Lin, Der-Yuh

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AB - We report that the quasibound states at the above-barrier region in type-II ZnTe/CdSe superlattices can be clearly observed at room temperature by photoreflectance, contactless electroreflectance, as well as photoconductivity measurements. We provide concrete evidence to confirm that free-carrier confinement at barrier layer (either in the valence-band CdSe layer or in the conduction-band ZnTe layer) does exist. It is found that the barrier-width dependence of the above-barrier ground-state transition energies can be described well by the constructive interference condition. We also observe the absorptive spatially indirect transition between electrons confined in the CdSe and holes confined in the ZnTe layers.

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