Effects Of Dimethylamine (DMA) And Ethylenediaminetetraacetic Acid (EDTA) On Optical, Structural And Morphological Properties Of Zinc Oxide Thin Films Prepared By Chemical Bath Deposition Technique

摘要

Abstract- The ZnO films were prepared by Chemical Bath Deposition (CBD) technique without employing any stirring technique using weak and strong complexing agents such as Dimethylamine (DMA) and Ethylenediaminetetraacetic acid (EDTA). The optical, structural, and morphological properties of ZnO films have been investigated. When the complexing agent were DMA and EDTA, the X-ray diffraction (XRD) patterns from the values of interplanar spacing of a=3.351' and c=5.226' were hexagonal structure. The film grown using EDTA was well defined grains with a thickness in the range 0.5 - 0.7μm while the SEM micrograph of DMA film has no well defined crystallites and this was due to restriction on precipitation. The films prepared in absence of complexing agent shows reflections along (002), (200) and (203) planes corresponding to formation of hexagonal wurtzite structure of zinc oxide and formed a network of flakes and magnified cauliflowers of diameter 0.8-1μm. The optical band gap for DMA and EDTA associated thin films were 3.3 and 3.35Ev respectively. Therefore, the effect of complexing agent on the crystal phase of ZnO films was generally found. The thin films obtained in this research could be used in high density data storage systems, solid-state lighting (where white light is obtained from phosphors excited by blue or UV light-emitting diodes), secure communications and bio-detection.