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Improving the grain size of \(\text {Cu}_{2}\text {ZnSnS}_{4}\) thin films by annealing thermally evaporated Cu–ZnS–Sn–S precursors

  • U. Chalapathi
  • M. A. Scarpulla
  • Si-Hyun ParkEmail author
  • S. Uthanna
  • V. Sundara Raja
Article
  • 38 Downloads

Abstract

In this study, \(\text {Cu}_{2}\text {ZnSnS}_{4}\) (CZTS) thin films were grown on Mo-coated glass substrates by thermal evaporation of the precursor layers followed by annealing in a graphite box. The effect of annealing on the grain growth and morphology of the CZTS thin films was investigated at two different temperatures and \(\text {S}_{2}\) partial pressures. X-ray diffraction and Raman spectroscopy analyses confirmed the formation of CZTS films with a kesterite structure with (112) preferred orientation. The grain growth was significantly enhanced by annealing the stacks at \(550\,^\circ {\text{C}}\) for 30 min at a \(\text {S}_{2}\) partial pressure of \(1.2 \times 10^{4}\,\text{Pa}\). The grain size was found to be in the range of \(1.0{-}2.0\,\upmu \text {m}\). The same grain size was obtained by carrying out the annealing at \(580\,^\circ {\text{C}}\) and a \(\text {S}_{2}\) partial pressure of \(1.96 \times 10^{4}\,\text{Pa}\) just for 10 min. This grain size was much larger than the grain size of CZTS films obtained from annealing the stacks in two-zone tubular furnaces.

Notes

Acknowledgements

One of the authors Dr. U. Chalapathi, is grateful to the Indo-US Science and Technology Forum (IUSSTF) and Department of Science and Technology (DST), India, for providing Bhaskara Advanced Solar Energy (BASE) Internship to carry out this research work. Dr. S. Uthanna is thankful to the University Grants Commission, New Delhi, India, for the award of UGC-BSR Faculty Fellowship.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • U. Chalapathi
    • 1
    • 3
  • M. A. Scarpulla
    • 2
  • Si-Hyun Park
    • 3
    Email author
  • S. Uthanna
    • 1
  • V. Sundara Raja
    • 1
  1. 1.Department of PhysicsSri Venkateswara UniversityTirupatiIndia
  2. 2.Materials Science & Engineering and Electrical & Computer Engineering DepartmentsUniversity of UtahSalt Lake CityUSA
  3. 3.Department of Electronic EngineeringYeungnam UniversityGyeongsanSouth Korea

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