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Opto-Electronic Properties of Cu2ZnSnS4 Thin Films Grown by Ultrasonic Spray Pyrolysis

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Abstract

Cu2ZnSnS4 (CZTS) films are deposited by ultrasonic spray pyrolysis technique for photovoltaic applications. The optoelectronic properties are studied by varying Zn and Sn compositions in the film. Films showed a tetragonal kesterite structure with preferential orientation along the (112) plane. The sample with the highest Cu concentration showed the lowest band gap of 1.46 eV. The grain size of the films is greater than 1 μm. Temperature-dependent conductivity studies revealed the presence of defects such as VCu, VS, VSn, CuZn, ZnCu, ZnSn and SnZn in the films. The sample with a Cu/(Zn + Sn) ratio of 0.75 showed Cu-poor and Zn-rich composition and better opto-electronic properties. The sample has p-type conductivity with a resistivity of 12 Ω cm. A [VCu–ZnCu] defect complex is identified in this sample along with a ZnSn acceptor level which is favorable for solar cells.

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Authors and Affiliations

  1. Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, Karnataka, 560012, India

    K. G. Deepa & Nagaraju Jampana

  2. Department of Physics, St. Alberts’s College, Ernakulam, 682018, India

    T. H. Sajeesh

Authors
  1. K. G. Deepa
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  2. T. H. Sajeesh
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  3. Nagaraju Jampana
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Correspondence to K. G. Deepa.

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Deepa, K.G., Sajeesh, T.H. & Jampana, N. Opto-Electronic Properties of Cu2ZnSnS4 Thin Films Grown by Ultrasonic Spray Pyrolysis. J. Electron. Mater. 47, 530–535 (2018). https://doi.org/10.1007/s11664-017-5803-3

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  • DOI: https://doi.org/10.1007/s11664-017-5803-3

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