In:
ECS Transactions, The Electrochemical Society, Vol. 25, No. 8 ( 2009-09-25), p. 199-206
Abstract:
Photoluminescence spectra of polar ZnO/c-Al2O3 and non-polar ZnO/r-Al2O3 films grown by the atmospheric-pressure CVD using Zn and H2O as source materials have been investigated. For the non-polar films, the I0, I1 and I2 lines on the high energy side of exciton-region were relatively strong. For the polar films, however, these emission lines were very weak. Moreover, several non-polar films exhibited the C-exciton emission. These differences between the polar and non-polar films are probably due to the difference in polarization selectivity resulting from the difference in growth direction. For both the polar and non-polar films, the I4 line attributed to the exciton bound to the H related donor increased with source supply ratio of H2O to Zn. For the non-polar films, the I6, I8 and I9 lines attributed to the group III elements became weaker with increasing Zn source temperature suggesting the possibility of impurity doping under stoichiometry control.
Type of Medium:
Online Resource
ISSN:
1938-5862
,
1938-6737
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2009
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