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Journal of Materials Science

, Volume 44, Issue 1, pp 316–322 | Cite as

Structural, optical, and electrical properties of flash-evaporated copper indium diselenide thin films

  • N. M. Shah
  • J. R. Ray
  • V. A. Kheraj
  • M. S. Desai
  • C. J. PanchalEmail author
  • Bharti Rehani
Article

Abstract

Copper indium diselenide (CuInSe2) compound was synthesized by reacting its elemental components, i.e., copper, indium, and selenium, in stoichiometric proportions (i.e., 1:1:2 with 5% excess selenium) in an evacuated quartz ampoule. Structural and compositional characterization of synthesized pulverized material confirms the polycrystalline nature of tetragonal phase and stoichiometry. CuInSe2 thin films were deposited on soda lime glass substrates kept at different temperatures (300–573 K) using flash evaporation technique. The effect of substrate temperature on structural, morphological, optical, and electrical properties of CuInSe2 thin films were investigated using X-ray diffraction analysis (XRD), atomic force microscopy (AFM), optical measurements (transmission and reflection), and Hall effect characterization techniques. XRD analysis revealed that CuInSe2 thin films deposited above 473 K exhibit (112) preferred orientation of grains. Transmission and reflectance measurements analysis suggests that CuInSe2 thin films deposited at different substrate temperatures have high absorption coefficient (~104 cm−1) and optical energy band gap in the range 0.93–1.02 eV. Results of electrical characterization showed that CuInSe2 thin films deposited at different substrate temperatures have p-type conductivity and hole mobility value in the range 19–136 cm2/Vs. Variation of energy band gap and resistivity of CuInSe2 thin films deposited at 523 K with thickness was also studied. The temperature dependence of electrical conductivity measurements showed that CuInSe2 film deposited at 523 K has an activation energy of ~30 meV.

Keywords

Atomic Force Microscope Substrate Temperature Hall Effect Measurement Soda Lime Glass Substrate CuInSe2 Film 

Notes

Acknowledgements

N. M. Shah is grateful to University Grants Commission (UGC) (Western Region Office, Pune, India) for the award of teacher fellowship under “Faculty Improvement Program” in X plan. The authors also wish to thank UGC (New Delhi, India) for providing financial assistance through major research project.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • N. M. Shah
    • 1
  • J. R. Ray
    • 1
  • V. A. Kheraj
    • 1
  • M. S. Desai
    • 1
  • C. J. Panchal
    • 1
    Email author
  • Bharti Rehani
    • 2
  1. 1.Applied Physics Department, Faculty of Technology and EngineeringThe M. S. University of BarodaVadodaraIndia
  2. 2.Metallurgical Engineering Department, Faculty of Technology and EngineeringThe M. S. University of BarodaVadodaraIndia

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