Studies On Growth And Characterization Of Transition Metal Doped Zinc Oxide Nanorods For Optoelectronic Device Application

Abstract

Studies on growth and characterization of transition metal doped zinc oxide nanorods for newlineoptoelectronic device application are presented. In this work, undoped and transition metal newline(cobalt) doped zinc oxide (ZnO) nanorods were obtained by a simple chemical precipitation newlinemethod in the presence of capping agent Poly Vinyl Pyrrolidone (PVP) at room temperature. newlinePoly Vinyl Pyrrolidone (PVP) was used as a stabilizing agent. Synthesized samples were newlinecharacterized via their structural, optical, electroluminescence and morphological properties. newlineStructural properties and particles size have been studied by the X-ray diffraction (XRD) newlinepatterns of the samples, whereas scanning electron microscopy (SEM) and Transmission newlineElectron Microscope (TEM) have been used to study the surface morphology of ZnO newlinenanorods. Study of optical properties as energy band gap has been carried out using newlineabsorption spectra of ZnO nanorods. Photoluminescence (PL) data were collected using by newlineRF- 5301PC SHIMADZU spectrofluorophotometer using spectral slit width of 1.5 nm. newlineElectroluminescence measurements were performed with the help of an audio-oscillator newlinecoupled with a wide band amplifier (for high frequency excitation). The light output was newlinerecorded by a photomultiplier tube which was operated by a high voltage power supply. The newlineEL emission spectra were recorded by using a grating monocromator. newlineOn the basis of XRD results Cell volume, bond length, texture coefficient, lattice constants newlineand dislocation density have been calculated. Here, we also compared the interplaner spacing newlineand relative peak intensities from their standard values with different angles. Crystallite sizes newlinehave been calculated by Debye Scherrer formula whose values were decreasing with increase newlinein cobalt content up to 3%. It has been seen that the growth orientation of the prepared ZnO newlinenanorods were (101). The XRD analysis also ensures that ZnO has a hexagonal (wurtzite) newlinecrystal structure. newlineOptical absorption spectra of pure and cobalt doped ZnO nanorods were obtained using newlinePerkin E