Abstract

Zinc Oxide (ZnO) nanoparticle has been synthesized with varying molar concentration by chemical bath deposition method using PVP matrix. HRTEM image clearly exhibits the spherical type particle morphology with average 5 nm size distributions. Optical band gaps of the prepared ZnO nanoparticles are found to be 2.89 eV–3.30 eV on decreasing molar concentration from 1 M to 0.0001 M. The particle size determined PL peak is in well agreement with HRTEM measurement. Photocurrent (I) - light intensity (φ) characteristics exhibits sublinear as well as super linearity behavior. The temperature dependence of conductivity shows two activation energies thatsupport the defect-controlled photoconductivity. The photo detecting parameters at three prime visible lights are determined and correlated with growth. The photo detector parameter increases sharply on lowering molar concentration below 0.1 M and shows a better response to blue light. Thus, ZnO at a lower concentration can explore the suitability of the photo detecting viability in visible range.

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