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Title: | Highly conductive and transparent laser ablated nanostructured Al: ZnO thin films |
Authors: | Vinodkumar, R. Navas, I. Chalana, S.R. Gopchandran, K.G. Ganesan, V. Philip, Reji Sudheer, S.K. Pillai, Mahadevan V.P. |
Issue Date: | 15-Nov-2010 |
Publisher: | Elsevier B.V. |
Citation: | Applied Surface Science , 2010, Vol.257, p708 |
Abstract: | Al doped ZnO thin films are prepared by pulsed laser deposition on quartz substrate at substrate temperature 873K under a background oxygen pressure of 0.02 mbar. The films are systematically analyzed using X-ray diffraction, atomic force microscopy, micro-Raman spectroscopy, UV-vis spectroscopy, photoluminescence spectroscopy, z-scan and temperature-dependent electrical resistivity measurements in the temperature range 70-300 K. XRD patterns show that all the films are well crystallized with hexagonal wurtzite structure with preferred orientation along (0 0 2) plane. Particle size calculations based on XRD analysis show that all the films are nanocrystalline in nature with the size of the quantum dots ranging from 8 to 17 nm. The presence of high frequency E-2 mode and longitudinal optical A(1) (LO) modes in the Raman spectra suggest a hexagonal wurtzite structure for the films. AFM analysis reveals the agglomerated growth mode in the doped films and it reduces the nucleation barrier of ZnO by Al doping. The 1% Al doped ZnO film presents high transmittance of similar to 75% in the visible and near infrared region and low dc electrical resistivity of 5.94x10(-6) Omega m. PL spectra show emissions corresponding to the near band edge (NBE) ultra violet emission and deep level emission in the visible region. Nonlinear optical measurements using the z-scan technique shows optical limiting behavior for the 5% Al doped ZnO film. |
Description: | Restricted Access. |
URI: | http://hdl.handle.net/2289/4008 |
ISSN: | 0169-4332 |
Alternative Location: | http://dx.doi.org/10.1016/j.apsusc.2010.07.044 |
Copyright: | 2010 Elsevier B. V. |
Appears in Collections: | Research Papers (LAMP) |
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