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Naser Mahmoud,Mazin Auny and Jalal Jabbar ZnO/CdS Core-shells Optical Sensor fabrication using Chemical Method

Naser Mahmoud,Mazin Auny and Jalal Jabbar ZnO/CdS Core-shells Optical Sensor fabrication using Chemical Method

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The CdS were deposited on the ZnO nanorods to create core-shell structure by using CBD method with cadmium chloride (CdCl2) 0.15M as Cd2+ ion source at difference deposition time. The devices affect the light absorption and have higher sensitivity to the light. This book focuses on fabrication of ZnO/CdS optical sensor. The energy band gap of ZnO/CdS was also lowered to 3.3eV... ZnO nanorods were the core and CdS were the shell of this core-shell structure. The photoconductive testing was carried out to test this optical sensor light detection by shining ultraviolet (UV) light pulse on the devices. Nanocrystalline ZnO/CdS core-shell optical sensors were fabricated by chemical bath deposition (CBD) method. Vertically aligned ZnO nanorods were firstly synthesized on silicon p-type (111) by CBD method with assist of microwave. The highest sensitivity reached 53% for the ZnO/CdS optical sensor while the ZnO optical sensor only 6.77% and ZnO/CdS can response to high frequency light pulse.

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