Structural, microstructural, and optical properties of Zn12xMgxO thin films grown onto glass substrate by ultrasonic spray pyrolysis
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Date
2015-05-28
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Abstract
Pure and doped Zn1-xMgxO films were deposited onto glass substrate by ultrasonic spray pyrolysis
technique. The variation of lattice constant and the blue
shift of near-band-edge emission indicate that Zn2? ions
are successfully substituted by Mg2? ions within ZnO
lattice. At higher Mg content (x C 0.21), a drastic change
appears in the morphology, as a result of structural changes
from wurtzite (ZnO) structure into a mixture of wurtzite
and cubic (MgO) phases. FTIR study indicated the existence of distinct characteristic absorption peaks at
*442 cm-1 for Zn–O stretching mode that shifted toward
the red region with the increase in Mg content. In addition
to the host phonons of ZnO, one additional band was observed around 523 cm-1, presumably attributed to the Mgrelated vibrational mode. The optical constants and thickness of thin films have been determined using experimental
transmittance data. The luminescence intensity at 2.63 eV
of Zn0.85Mg0.15O thin films was found to be approximately
13 times higher than that of pure ZnO film measured under
the same excitation conditions