A study on the energy bands of multi-quantum wells in the quantum cascade laser structure by deep-level transient spectroscopy

Jin Soak Kim, Eun Kyu Kim, Il Ki Han, Jin Dong Song, Jung Il Lee, Sejoon Lee, Yoon Shon, D. Y. Kim

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

We have investigated the defect states and confined energy levels of three quantum wells (QWs) in the quantum cascade laser (QCL) structure by capacitance-voltage and deep-level transient spectroscopy methods. Defect states with activation energies in the range of 0.49-0.88 eV were obtained in the GaAs capping layer, and their origins were considered as EL3 and EL2 families, which are well-known deep levels of GaAs materials. The densities of these defects in the GaAs capping layer of the QCL structure were about 3-12% of the donor concentration. The confined energy levels of QWs showed activation energies of about 130 meV and 230 meV from the top of the AlGaAs barrier, and their carrier confinement ability was measured to be about 0.5% of the donor concentration.

Original languageEnglish
Article number015
Pages (from-to)1069-1072
Number of pages4
JournalSemiconductor Science and Technology
Volume21
Issue number8
DOIs
StatePublished - 2006 Aug 1

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