Intrinsic defects in ZnO nanoparticles synthesized by the sol-gel and combustion techniques
V. P. Singh, Chandana Rath
We investigate intrinsic defects in ZnO synthesized through sol-gel and combustion techniques using various spectroscopic techniques such as RAMAN, Photoluminescence and Positron annihilation. Pure wurtzite phase of ZnO shows E1(LO) mode in Raman spectra indicating the presence of interstitial zinc which decreases with increase in calcination temperature irrespective of synthesis techniques and further supported by Positron life time measurement. Williamson-Hall analysis shows tensile and compressive strain for samples made by sol-gel and combustion techniques, respectively. The photoluminescence study demonstrates broad defect band emission (DBE) in compressive strained sample only. The unusual increase in DBE peak with increase in calcination temperature is discussed.
Keywords
Oxides, Chemical Synthesis, Raman Spectroscopy, Positron Annihilation Spectroscopy, Defects
Published online 1/1/2017, 18 pages
DOI: http://dx.doi.org/10.21741/9781945291135-5
Part of Contemporary Dielectric Materials
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