Optical and Structure Analysis of ZnO:Al Film
Journal Title: American Journal of Engineering and Applied Sciences - Year 2017, Vol 10, Issue 4
Abstract
Optical and Structure Analysis of ZnO:Al Film Neilo Marcos Trindade, Michel Chaves, José Roberto Ribeiro Bortoleto, Américo Sheitiro Tabata and José Humberto Dias da Silva DOI : 10.3844/ajeassp.2017.790.798 American Journal of Engineering and Applied Sciences Volume 10, Issue 4 Pages 790-798 Abstract ZnO and ZnO:Al are wide-bandgap semiconductors which have many applications, mainly as transparent conducting ?lms. Thin films of these compounds were deposited onto glass and silicon substrates by RF magnetron sputtering for the investigation of structural and optical characteristics. The XRD results show that the films present wurtzite structure. The formation of a polycrystalline film having a preferential crystallographic orientation in the plane (002) is observed in the doped samples. The Al incorporated films exhibited optical transmittance above 80% in the visible spectrum and a clear absorption band in the infrared due to free carriers. Additionally, the optical band gap around 3.48 eV is significantly above the values for the intrinsic ZnO (3.25 eV). Photoluminescence (PL) measurements showed a broad emission band in the visible region. In addition, PL emission lines at 3.32 and 3.37 eV showed up in Al incorporated films, and were related to excitonic emissions. The results show that the Burstein-Moss effect plays a central role in determining the optical characteristics of the doped material. Copyright © 2017 Neilo Marcos Trindade, Michel Chaves, José Roberto Ribeiro Bortoleto, Américo Sheitiro Tabata and José Humberto Dias da Silva. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Authors and Affiliations
Neilo Marcos Trindade, Michel Chaves, José Roberto Ribeiro Bortoleto, Américo Sheitiro Tabata, José Humberto Dias da Silva
Keywords
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- EP ID EP248320
- DOI 10.3844/ajeassp.2017.790.798
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