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Effect of polycrystallinity on the optical properties of highly oriented ZnO grown by pulsed laser deposition

McGlynn, Enda and Fryar, James and Tobin, Ger and Roy, C. and Henry, Martin O. and Mosnier, Jean-Paul and de Posada, Eduardo and Lunney, James G. (2004) Effect of polycrystallinity on the optical properties of highly oriented ZnO grown by pulsed laser deposition. Thin Solid Films, 458 (1-2). pp. 330-335. ISSN 0040-6090

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Abstract

We report the results of photoluminescence and reflectance measurements on highly c-axis oriented polycrystalline ZnO grown by pulsed laser deposition. The samples measured were grown under identical conditions and were annealed in-situ at various temperatures for 10-15 min. The band-edge photoluminescence spectra of the material altered considerably with an increase in grain size, with increased free exciton emission and observable excitonic structure in the reflectance spectra. The green band emission also increased with increasing grain size. A deformation potential analysis of the effect of strain on the exciton energy positions of the A- and B-excitons demonstrated that the experimental exciton energies could not be explained solely in terms of sample strain. We propose that electric fields in the samples due to charge trapping at grain boundaries are responsible for the additional perturbation of the excitons. This interpretation is supported by theoretical estimates of the exciton energy perturbation due to electric fields. The behaviour of the green band in the samples provides additional evidence in favour of our model.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:transition element compound; inorganic compounds; columnar structure; thin films; II-VI semiconductors; binary compounds; zinc oxides; oxide ceramics; polycrystals; grain boundaries; trapping; electric field effects; stress effects; deformation; excitons; annealing; reflectivity; photoluminescence; pulsed lasers; laser ablation technique; crystal growth from vapors; experimental study;
Subjects:Physical Sciences > Thin films
Physical Sciences > Physics
Physical Sciences > Lasers
Physical Sciences > Semiconductors
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Plasma Science and Technology (NCPST)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.tsf.2003.12.045
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:7
Deposited On:26 Oct 2006 by DORAS Administrator. Last Modified 29 Jan 2009 16:17

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