Temperature Dependence of the Excitonic Energy Band Gap in In(Ga)As Nanostructures

Oleksii Kopylov, Jungil Lee, Ilki Han, Won Jun Choi, Jin Dong Song, Ina Yeo

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We analyzed the temperature-dependent variation of the peak energies in the photoluminescence of InAs/GaAs quantum dots and InAs/In0.2Ga0.8As/GaAs quantum dots in an asymmetric well. The InAs dots were grown by using migration-enhanced molecular beam epitaxy. The peak emission energies decreased monotonously with increasing temperature over the range of measurements from 13 K to 225 K. The temperature dependence of the peak energy was successfully fitted with two analytic models, namely, the phenomenological Varshni equation and the semi-empirical Fan equation based on electron-phonon statistics, respectively. The physical meaning of the Varshni coefficients is discussed in terms of the phonon energy and the strain in the nanostructures.
Original languageEnglish
JournalJournal of the Korean Physical Society
Volume60
Issue number10
Pages (from-to)1828-1832
ISSN0374-4884
DOIs
Publication statusPublished - 2012
Externally publishedYes

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