Optical properties and structural characteristics of ZnMgO grown by plasma assisted molecular beam epitaxy

Thomas A. Wassner, Bernhard Laumer, Stefan Maier, Andreas Laufer, Bruno K. Meyer, Martin Stutzmann, Martin Eickhoff

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

102 Zitate (Scopus)

Abstract

Wurtzite Zn1-x Mgx O thin films with Mg contents between x=0 and x=0.37 were grown on c -plane sapphire substrates by plasma assisted molecular beam epitaxy using a MgO/ZnMgO buffer layer. The a -lattice parameter is independent from the Mg concentration, whereas the c -lattice parameter decreases from 5.20 Å for x=0 to 5.17 Å for x=0.37, indicating pseudomorphic growth. The near band edge photoluminescence shows a blueshift with increasing Mg concentration to an emission energy of 4.11 eV for x=0.37. Simultaneously, the energetic position of the deep defect luminescence shows a linear shift from 2.2 to 2.8 eV. Low temperature transmission measurements reveal strong excitonic features for the investigated composition range and alloy broadening effects for higher Mg contents. The Stokes shift as well as the Urbach energy is increased to values of up to 125 and 54 meV for x=0.37, respectively, indicating exciton localization due to alloy fluctuations.

OriginalspracheEnglisch
Aufsatznummer023505
FachzeitschriftJournal of Applied Physics
Jahrgang105
Ausgabenummer2
DOIs
PublikationsstatusVeröffentlicht - 2009

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