Wavelength-modulated excitonic spectra in green series of Cu sub(2)O thin films sandwiched by MgO plates

In order to clarify uniaxial stress effects on a green excitonic series in Cu sub(2)O, we measured temperature dependence of wavelength modulated (WM) absorption spectra of a Cu sub(2)O thin film sandwiched by MgO plates. In these spectra, excitonic resonances of 2P4P states are clearly observed eve...

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Published inPhysica status solidi. C Vol. 9; no. 12; pp. 2489 - 2492
Main Authors Iwamitsu, Kazunori, Aihara, Shingo, Shimamoto, Tomoshige, Fujii, Atsuhiro, Akai, Ichiro
Format Journal Article
LanguageEnglish
Published 01.12.2012
Subjects
COPPER OXIDE
Crystal lattices
CUPROUS OXIDE
Excitation spectra
LATTICES (CRYSTAL)
MAGNESIUM OXIDE
PLATE
Plates
Spectra
STRESS
Stresses
THIN FILMS
Trapping
WAVELENGTH
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Summary:In order to clarify uniaxial stress effects on a green excitonic series in Cu sub(2)O, we measured temperature dependence of wavelength modulated (WM) absorption spectra of a Cu sub(2)O thin film sandwiched by MgO plates. In these spectra, excitonic resonances of 2P4P states are clearly observed even at 180 K. From these resonance spectral structures at each temperature, it is found that the band gap of the green series shifts to lower energy side than that of bulk crystals and the red shift becomes obvious with cooling down to 7 K. These results indicate that the trapping potential for the green excitons is formed by the uniaxial stress due to a lattice mismatch between the Cu sub(2)O and MgO ( copyright 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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ISSN:1862-6351
1610-1642
DOI:10.1002/pssc.201200179