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Usharani K.,A Veeriya Vandayar Memorial Sri Pushpam College | Balu A.R.,A Veeriya Vandayar Memorial Sri Pushpam College
Journal of Materials Science: Materials in Electronics | Year: 2016

Undoped CdO film and CdO films which are alloyed with Zn and Mg (ZMCO) at different concentrations were prepared by spray pyrolysis technique using perfume atomizer on glass substrates kept at 400 °C. The effect of Zn, Mg incorporation on the structural, morphological, optical and electrical properties of the CdO films were investigated using X-ray diffraction (XRD), scanning electron microscopy, UV–Vis spectroscopy and dc electrical measurements respectively. XRD analysis showed that all the alloyed films exhibit polycrystalline nature having cubic crystal structure with a (1 1 1) preferential orientation similar to that of the undoped sample. All the Zn, Mg incorporated CdO films have good transparency in the visible region. Optical band gap is blue shifted with increasing Zn, Mg concentration. Electrical studies showed that the ZMCO film coated with 6 at.% Zn, Mg concentration exhibit a minimum resistivity of 0.724 × 10−4 Ω-cm. The high transparency, widened band gap energy and improved electrical properties obtained infer that ZMCO thin films find applications in optoelectronic devices, especially in solar cells. © 2015, Springer Science+Business Media New York.


Sivaraman T.,A Veeriya Vandayar Memorial Sri Pushpam College | Nagarethinam V.S.,A Veeriya Vandayar Memorial Sri Pushpam College | Balu A.R.,A Veeriya Vandayar Memorial Sri Pushpam College | Balu A.R.,New Housing Unit | Usharani K.,A Veeriya Vandayar Memorial Sri Pushpam College
Journal of Materials Science: Materials in Electronics | Year: 2016

CdS thin films simultaneously doped with Mg and Cl at different doping concentrations (0, 2, 4, 6 and 8 at%) were prepared on glass substrates by spray pyrolysis technique using perfume atomizer at 400 °C. The effect of Mg and Cl doping concentration on the structural, morphological, optical and electrical properties of the deposited films were investigated using X-ray diffraction (XRD), scanning electron microscopy, UV–Vis spectroscopy and dc electrical measurements, respectively. XRD analysis showed that the undoped and doped CdS films exhibit hexagonal structure with a preferential orientation along the (0 0 2) plane. The 2θ angle position of the (0 0 2) peak of the doped films was shifted towards a higher angle with increasing Mg and Cl concentration. The UV–Vis–NIR absorption spectra of Mg and Cl doped thin films are measured and classical Tauc approach was employed to estimate their band gap energies. The increase in band gap energy from 2.46 to 2.73 eV with the reduction in crystallite size supports quantum size effect. Raman spectra implied that more defects existed in the doped samples. Electrical studies showed that all the films have resistivity in the order of 101 Ω-cm and the CdS film with 6 at% Mg and Cl concentration has a minimum resistivity of 1.332 × 101 Ω-cm. © 2015, Springer Science+Business Media New York.


Rajashree C.,A Veeriya Vandayar Memorial Sri Pushpam College | Balu A.R.,A Veeriya Vandayar Memorial Sri Pushpam College | Nagarethinam V.S.,A Veeriya Vandayar Memorial Sri Pushpam College
Surface Engineering | Year: 2015

Highly crystalline cadmium doped lead sulphide (PbS:Cd) thin films with different Cd doping concentrations (0, 2, 4, 6 and 8 at-%) were fabricated on glass substrates using spray pyrolysis technique. The X-ray diffraction (XRD) studies revealed that all the films exhibit face centred cubic structure with a preferential orientation along the (2 0 0) plane irrespective of Cd doping concentration. Optical studies showed that the band gap of doped films vary between 1 96 and 2 12 eV with increasing Cd content and the film coated with 6 at-% Cd dopant has a maximum transmittance of nearly equal to 77%. Electrical studies revealed that the film coated with 6 at- %Cd dopant has a maximum conductivity of 12 6761021 V cm21. The obtained results infer that the PbS:Cd film coated with 6 at-%Cd dopant has better structural, morphological, optical and electrical properties. © 2015 Institute of Materials.


Sivaraman T.,A Veeriya Vandayar Memorial Sri Pushpam College | Balu A.R.,A Veeriya Vandayar Memorial Sri Pushpam College | Nagarethinam V.S.,A Veeriya Vandayar Memorial Sri Pushpam College
Materials Science in Semiconductor Processing | Year: 2014

Undoped CdS and nanostructured Mg-doped CdS (CdS:Mg) thin films were deposited on suitably cleaned glass substrates maintained at 400°C by a spray pyrolysis technique using perfume atomizer. The magnesium content in the films is varied from 0 to 8 at% in steps of 2 at%. The effect of Mg doping on the structural, morphological, optical and electrical properties of CdS thin films has been studied. The crystal structures of the films were determined by X-ray diffraction studies. All the films exhibit hexagonal structure with a preferential orientation along the (002) plane irrespective of the Mg doping level. Film surface modifies from porous nature to needle shaped nanorods with Mg doping. The optical band gap energy exhibits a decreasing trend and is shifted from 2.48 to 2.29 eV with increasing Mg content. Film coated with 6 at% Mg doping concentration exhibits a minimum resistivity of 1.87×102 Ω m. © 2014 Elsevier Ltd. All rights reserved.


Usharani K.,A Veeriya Vandayar Memorial Sri Pushpam College | Balu A.R.,A Veeriya Vandayar Memorial Sri Pushpam College | Nagarethinam V.S.,A Veeriya Vandayar Memorial Sri Pushpam College
Surface Engineering | Year: 2016

This paper reports the effect of chlorine doping on the properties of spray-deposited cadmium oxide (CdO) thin films simultaneously doped with two metallic ions, zinc and magnesium. All the films have polycrystalline nature exhibiting cubic crystal structure. The preferential orientation along the (111) plane observed for the undoped and Zn, Mg co-doped CdO (ZMCO) films changed to (200) plane with Cl doping. Cl doping enhances the optical transparency of ZMCO thin films causing a blue shift in their band gap values which was attributed to Burstein–Moss (BM) effect. Electrical resistivity studies showed an increase in free carrier concentration of ZMCO films through Cl doping. The ZMCO films were found to have enhanced physical properties through Cl doping which make them suitable for optoelectronic applications. © 2016 Institute of Materials, Minerals and Mining

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