Spectroscopic and luminescent properties of Co<sup>2+</sup> doped tin oxide thin films by spray pyrolysis

K. Ravindranadh; K. Durga Venkata Prasad; M.C. Rao; K. Ravindranadh; K. Durga Venkata Prasad; M.C. Rao

doi:10.3934/matersci.2016.3.796

AIMS Materials Science

2016, Volume 3, Issue 3: 796-807. doi: 10.3934/matersci.2016.3.796

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Research article Topical Sections

Spectroscopic and luminescent properties of Co²⁺ doped tin oxide thin films by spray pyrolysis

1.
Physics Division, Department of Basic Sciences & Humanities, Chirala Engineering College, Chirala-523 157, India;
2.
Department of Physics, Andhra Loyola College, Vijayawada - 520 008, India

Received: 04 June 2016 Accepted: 30 June 2016 Published: 04 July 2016

The wide variety of electronic and chemical properties of metal oxides makes them exciting materials for basic research and for technological applications alike. Oxides span a wide range of electrical properties from wide band-gap insulators to metallic and superconducting. Tin oxide belongs to a class of materials called Transparent Conducting Oxides (TCO) which constitutes an important component for optoelectronic applications. Co²⁺ doped tin oxide thin films were prepared by chemical spray pyrolysis synthesis and characterized by powder X-ray diffraction, SEM, TEM, FT-IR, optical, EPR and PL techniques to collect the information about the crystal structure, coordination/local site symmetry of doped Co²⁺ ions in the host lattice and the luminescent properties of the prepared sample. Powder XRD data revealed that the crystal structure belongs to tetragonal rutile phase and its lattice cell parameters are evaluated. The average crystallite size was estimated to be 26 nm. The morphology of prepared sample was analyzed by using SEM and TEM studies. Functional groups of the prepared sample were observed in the FT-IR spectrum. Optical absorption and EPR studies have shown that on doping, Co²⁺ ions enter in the host lattice as octahedral site symmetry. PL studies of Co²⁺ doped SnO₂ thin films exhibit blue and yellow emission bands. CIE chromaticity coordinates were also calculated from emission spectrum of Co²⁺ doped SnO₂ thin films.

Keywords:

Citation: K. Ravindranadh, K. Durga Venkata Prasad, M.C. Rao. Spectroscopic and luminescent properties of Co2+ doped tin oxide thin films by spray pyrolysis[J]. AIMS Materials Science, 2016, 3(3): 796-807. doi: 10.3934/matersci.2016.3.796

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Abstract

Due to a high surface to volume ratio, significant transport properties, and confinement effects resulting from the nanoscale dimensions, nanostructured materials are extensively studied for energy-related applications such as solar cells, catalysts, thermoelectrics, lithium ion batteries, super-capacitors, and hydrogen storage systems. Therefore extensive studies in this field are necessary to accomplish this challenge for the next decades. The editors of the Special Issue on Nanomaterials for energy and environmental applications in AIMS Materials Science tried to bring together experts in this field to describe the current state of the art of the study and to formulate new research directions. The Special issue contains eleven manuscripts from research groups in different countries presenting relevant results on energy related materials such as transparent conducting nanostructures (TiO₂, SnO₂, ZnO, Ga₂O₃, CuO, In₂O₃, GeO₂, In₂Ge₂O₇, ZnGa₂O₄, Zn₂GeO₄,Sb₂O₃),semiconductors (Si, Ge, CdSe, Ge₃N₄, InN) and organics. The contributors are at the forefront of the discipline, and their insightful scientific presentations will surely affect the next generations of materials scientists. The publications reflect the strong international interactions among physicists, chemists, engineers, materials scientists and technologists working in this field as well as the advantages, limitations and challenges of applications of nanomaterials. We hope that readers will find the papers interesting and stimulating further discussions in the field.

As guest editors of the special issue, we want to thank Dr. Shengjiao Pang, Editor and the technical staff who supported our initiative and made this special issue possible. Also, we thank all contributors of selected papers presented herein.

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