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Tuning electro-optical properties of pulsed dc magnetron sputtered indium tin oxide thin films: effects of pulsing frequency and annealing

  • R. Sivakumar
  • Mohit Kumar
  • C. Sanjeeviraja
  • T. Som
Article

Abstract

We report on effects of pulsing frequency and annealing temperature on structural and electro-optical properties of thin indium-tin-oxide (ITO) films prepared by pulsed dc magnetron sputtering technique. Phase analysis shows that as-deposited ITO films belong to crystalline bixbyite structure with (400) preferred orientation. Optical transmittance of greater than 87 % is obtained in the visible range. This is followed by a clear shift in the absorption edge towards higher energy region which is indicative of a lower defect density near the band edge. The lowest resistivity value of 4.47 × 10−4 Ω-cm and the highest carrier concentration of 1 × 1021 cm−3 are achieved by annealing the films at 523 K in air. Variations in the energy band gap and resistivity of ITO films may be attributed to Sn doping and oxygen vacancies, which act as donors. The correlation between the deposition parameters and the film properties are discussed.

Keywords

In2O3 Pulse Frequency Ionize Impurity Scattering Bixbyite Structure Swanepoel Method 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank Sandeep Kumar Garg, Tanmoy Basu, and S.N. Sarangi for their assistance in this work. One of the authors (RS), gratefully acknowledges the Tamilnadu State Council for Science and Technology (TNSCST), Chennai, Tamilnadu, India for having awarded the Young Scientist Fellowship (YSFS) (Ref.: TNSCST/YSFS/VR/3/2010–2011, dt. 19.01.2011) for the year 2010–2011.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Directorate of Distance EducationAlagappa UniversityKaraikudiIndia
  2. 2.Institute of PhysicsBhubaneswarIndia
  3. 3.Department of PhysicsAlagappa Chettiar College of Engineering and TechnologyKaraikudiIndia

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