TITLE

Band gap engineering based on Mg[sub x]Zn[sub 1-x]O and Cd[sub y]Zn[sub 1-y]O ternary alloy films

AUTHOR(S)
Makino, T.; Segawa, Y.; Kawasaki, M.; Ohtomo, A.; Shiroki, R.; Tamura, K.; Yasuda, T.; Koinuma, H.
PUB. DATE
February 2001
SOURCE
Applied Physics Letters;2/26/2001, Vol. 78 Issue 9, p1237
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We describe the structural and optical properties of II-VI oxide alloys, Mg[sub x]Zn[sub 1-x]O and Cd[sub y]Zn[sub 1-y]O, grown by pulsed-laser deposition. Single-phase alloyed films of (Mg,Zn)O and (Cd,Zn)O with c-axis orientations were epitaxially grown on sapphire (0001) substrates. The maximum magnesium and cadmium concentrations (x=0.33 and y=0.07, respectively) were significantly larger than the thermodynamic solubility limits. The band gap energies systematically changed from 3.0 (y=0.07) to 4.0 eV (x=0.33) at room temperature. The photoluminescence peak energy deduced at 4.2 K could be tuned from 3.19 to 3.87 eV by using Cd[sub 0.07]Zn[sub 0.93]O and Mg[sub 0.33]Zn[sub 0.67]O at both ends, respectively. The lattice constants of the a axis were monotonically increasing functions of the concentrations of both alloys. The exciton-phonon coupling strength was determined in Cd[sub 0.01]Zn[sub 0.99]O grown on a lattice-matched ScAlMgO[sub 4] substrate. © 2001 American Institute of Physics.
ACCESSION #
4711126

 

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