Optical properties of MgZnO alloys: Excitons and exciton-phonon complexes | Zendy

M. Neumann | Zendy; Christoph Cobet | Zendy; N. Esser | Zendy; Bernhard Laumer | Zendy; Thomas A. Wassner | Zendy; Martin Eickhoff | Zendy; Martin Feneberg | Zendy; R. Goldhahn | Zendy

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Optical properties of MgZnO alloys: Excitons and exciton-phonon complexes

Author(s) -

M. Neumann,

Christoph Cobet,

N. Esser,

Bernhard Laumer,

Thomas A. Wassner,

Martin Eickhoff,

Martin Feneberg,

R. Goldhahn

Publication year - 2011

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.3606414

Subject(s) - exciton , photoluminescence , wurtzite crystal structure , materials science , phonon , molecular beam epitaxy , condensed matter physics , laser linewidth , ellipsometry , band gap , sapphire , spectral line , absorption (acoustics) , molecular physics , thin film , chemistry , optoelectronics , optics , epitaxy , laser , physics , nanotechnology , zinc , metallurgy , astronomy , layer (electronics) , composite material

The characteristics of the excitonic absorption and emission around the fundamental bandgap of wurtzite MgxZn1−xO grown on c-plane sapphire substrates by plasma assisted molecular beam epitaxy with Mg contents between x = 0 and x = 0.23 are studied using spectroscopic ellipsometry and photoluminescence (PL) measurements. The ellipsometric data were analyzed using a multilayer model yielding the dielectric function (DF). The imaginary part of the DF for the alloys exhibits a pronounced feature which is attributed to exciton-phonon coupling (EPC) similar to the previously reported results for ZnO. Thus, in order to determine reliable transition energies, the spectral dependence is analyzed by a model which includes free excitonic lines, the exciton continuum, and the enhanced absorption due to EPC. A line shape analysis of the temperature-dependent PL spectra yielded in particular the emission-related free excitonic transition energies, which are compared to the results from the DF line-shape analysis. The ...

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