Interdiffused InAsInGaAlAs quantum dashes-in-well structures studied by surface photovoltage spectroscopy

Ts Ivanov*, V. Donchev, Y. Wang, H. S. Djie, B. S. Ooi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We report the study of interband optical transitions in the interdiffused InAs quantum dash (QD) in InAlGaAs quantum well (QW) structures using room temperature surface photovoltage (SPV) spectroscopy. SPV signals have been detected from all relevant portions of both the as-grown and interdiffused structures including the QD, QW, and cladding layer. The effect of group-III intermixing on the interband optical transition energies in the interdiffused structures has also been revealed by the SPV spectroscopy, and the results have been confirmed by photoluminescence measurements. The SPV investigation shows that the compositional intermixing occurs not only between the dash and the surrounding well but also between the well and the surrounding barrier. The results demonstrate the potential of the SPV spectroscopy as a nondestructive, contactless method to characterize optical transitions in complex semiconductor nanostructures at room temperature.

Original languageEnglish (US)
Article number114309
JournalJournal of Applied Physics
Volume101
Issue number11
DOIs
StatePublished - 2007
Externally publishedYes

Bibliographical note

Funding Information:
We acknowledge the financial supports from the Bulgarian National Science Fund (Contract No. D01-463∕12.7.06) and the Alexander von Humboldt Foundation. The work at Lehigh University is supported in part by the U.S. Army Research Office through the Lehigh-Army Co-operation Agreement and the Pennsylvania Infrastructure Technology Alliance (PITA). One of the authors (Y.W.) would like to thank the Sherman Fairchild Foundation for the graduate student fellowship support.

ASJC Scopus subject areas

  • General Physics and Astronomy

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