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Electrical and optical properties of Co2+:SnO2 thin films deposited by spray pyrolysis technique

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Abstract

In this work, tin oxide (SnO2) and cobalt doped tin oxide (Co:SnO2) thin films are deposited by spray pyrolysis technique and the influence of doping concentration on the structural, morphological, electrical and optical properties of tin oxide films is analyzed and reported. X-ray diffraction pattern shows that the SnO2 and Co:SnO2 films are polycrystalline in nature and exhibit tetragonal crystal system. Co doping shifts the preferential growth orientation of SnO2 to (200) direction. Scanning electron microscopic studies show that the surface morphology of tin oxide films was effectively modified by various Co concentrations. X-ray photoelectron spectra of 5 at.% Co:SnO2 thin film reveal the presence of tin, oxygen, and cobalt. Carrier concentration and mobility of the SnO2 film decreases with increasing Co concentration and 0.5 at.% Co:SnO2 film acquires a mobility of 74 cm2/V s. The average optical transmittance of SnO2 thin film in the range of 500–800 nm increases due to Co doping.

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Acknowledgments

One of the authors T. Indira Gandhi is thankful to UGC-BSR, Govt. of India for the award of ‘Research Fellowship in Science for Meritorious Students-2010’.

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Authors and Affiliations

  1. Crystal Growth and Thin Film Laboratory, Department of Physics, Bharathidasan University, Tiruchirappalli, Tamil Nadu, 620 024, India

    T. Indira Gandhi & R. Ramesh Babu

  2. Crystal Growth and Thin Film Laboratory, Department of Physics and Nanotechnology, Faculty of Engineering and Technology, SRM University, Kattankulathur, Tamil Nadu, 603 203, India

    K. Ramamurthi

  3. Centre for Nanoscience and Technology, Anna University, Chennai, Tamil Nadu, 600 025, India

    M. Arivanandhan

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  1. T. Indira Gandhi
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  2. R. Ramesh Babu
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  3. K. Ramamurthi
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  4. M. Arivanandhan
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Correspondence to R. Ramesh Babu.

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Indira Gandhi, T., Ramesh Babu, R., Ramamurthi, K. et al. Electrical and optical properties of Co2+:SnO2 thin films deposited by spray pyrolysis technique. J Mater Sci: Mater Electron 27, 1662–1669 (2016). https://doi.org/10.1007/s10854-015-3938-7

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  • DOI: https://doi.org/10.1007/s10854-015-3938-7

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