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Published on: May 1, 2016
Conduction Mechanisms in Polyvinyl Alcohol: CdS/CdS:Cu Nanoparticle Hybrid Nanocomposites
Sweety Sarma1, Bakang Moses Mothudi1, Mokhotjwa Simon Dhlamini1
1Department of Physics, College of Science, Engineering and Technology, University of South Africa, Johannesburg, 1710, South Africa.
Abstract:
The electrical conduction mechanisms were investigated for the CdS and Cu-doped CdS (CdS:Cu) nanoparticles embedded in polyvinyl alcohol (PVA) (PVA/CdS and PVA/CdS:Cu) nanocomposites; synthesized by the chemical Sol Gel method on indium tin-oxide (ITO) substrate. X-ray diffraction pattern results show that the PVA/CdS nanocomposite is hawleyite-sturcture and PVA/CdS:Cu nanocomposites show greenockite-hawelyite mixed structure. The sizes of CdS and CdS:Cu nanoparticles were estimated from transmission electron microscopy (TEM) images and are ≈4 nm and ≈10 nm respectively; which were formed inside the PVA polymer layer. The devices were fabricated with Ag and ITO as electrodes with PVA/CdS and PVA/CdS:Cu nanocomposites as an active layers. The current-voltage (I-V ) relationships measurements shows the nature is extended memrisitve features for both PVA/CdS and PVA/CdS:Cu nanocomposites. The ION/IOFF ratios are enhanced and become more prominent in case of PVA/CdS:Cu nanocomposites device. The resistive switching characteristic show Schottky, Trapped-charge limited current (TCLC) and Space charge limited conduction (SCLC) mechanisms in Ag/PVA/CdS/ITO device; whereas Schottky, Ohmic, TCLC and SCLC were observed in Ag/PVA/CdS:Cu/ITO device.
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