TITLE

Dependence of the excitonic transition energies and mosaicity on residual strain in ZnO thin films

AUTHOR(S)
Ong, H. C.; Zhu, A. X. E.; Du, G. T.
PUB. DATE
February 2002
SOURCE
Applied Physics Letters;2/11/2002, Vol. 80 Issue 6, p941
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The mosacity and optical properties of ZnO on (0001) Al[sub 2]O[sub 3] grown by pulsed-laser deposition have been studied by x-ray diffraction and spectroscopic ellipsometry. Strong dependence has been found between the grain size and the residual strain along the c axis, ε[sub zz], as well as the film texture. In general, strain relieves and texture improves at larger grain size regardless of the growth conditions. The excitonic transition energies are also found to vary in the presence of strain field. It is observed that the transition energies increase with increasing strain and eventually they are resolved into two well-defined bands at the strain of 1.63%. By taking into account of the biaxial strain, the theoretical band structure of ZnO has been considered by solving the Luttinger–Kohn Hamiltonian. Reasonable agreement is found between the theory and experiment. © 2002 American Institute of Physics.
ACCESSION #
6005426

 

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