Spectroscopic ellipsometric observation of charge transfer transitions in Zn 1-xCo xSe films

Y. D. Ko, Y. D. Kim, S. L. Cooper, M. V. Klein, J. H. Park, B. T. Jonker

Research output: Contribution to journalArticlepeer-review

Abstract

We report the observation by spectroscopic ellipsometry of a charge-transfer-type p-to-d transition in Zn 1-xCo xSe films grown on GaAs substrates with 0 ≤ x < 0.1. For x > 0.04 samples, we observed an absorption feature near 4.3 eV within the Eo + Δ 0 - E 1 band gap region. This new structure appears to have the characteristics of a charge-transfer-type p-to-d transition. A many-body approach was used to interpret this feature as a local charge-transfer transition. Another observation, the decrease of the interference pattern above 2.2 eV, was explained as a nonlocal charge-transfer transition. A calculation using a multilayer model (air/Zn 1-xCo xSe/GaAs) showed the same behavior as that of the measured spectrum.

Original languageEnglish (US)
Pages (from-to)108-111
Number of pages4
JournalJournal of the Korean Physical Society
Volume31
Issue number1
StatePublished - 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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