Influence of different sulfur sources on the phase formation of Cu2ZnSnS4 (CZTS) nanoparticles (NPs)

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Abstract

Wurtzite (Wz) and kesterite (Ks) phases of Cu2ZnSnS4 (CZTS) nanoparticles (NPs) have been selectively synthesized via hot injection method using 1-octadecene (1-ODE) as solvent. The solvents, 1-dodecanethiol (1-DDT) and tert-dodecanethiol (t-DDT) were utilized to control the reactivity of metal precursors and to tune the desirable crystallographic phases. The phase purity of the as synthesized CZTS NPs was confirmed using X-ray diffraction results. TEM images indicate that the developed nanoparticles consist of a mixture of triangular shaped (height 20 ± 3 nm, width 17 ± 2 nm) and sphere shaped NPs (13.4 ± 0.4 nm). These nanoparticles were formed due to the influence of thiols without any additional capping ligands. The band gap of as-synthesized CZTS NPs were calculated as 1.41 eV for wurtzite phase (Wz—1-DDT) and 1.47 eV for kesterite phase (Ks—t-DDT) from UV–Visible absorption results. CZTS thin films were prepared via spin coating and the electrical properties were analysed using Hall Effect measurements. Both the phases of CZTS films exhibit p-type conductivity. Wurtzite phase of CZTS has higher mobility (23.6 cm−3) and carrier concentration (2.64 × 1017) compared to kesterite phase of CZTS films.

Notes

Acknowledgements

The authors sincerely thank Department of Science and Technology (DST-TM/SERI /FR/90 (G)) and University Grants Commission (F.No.42-855/2013) for funding the research work.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • C. Imla Mary
    • 1
  • M. Senthilkumar
    • 1
  • S. Moorthy Babu
    • 1
  1. 1.Crystal Growth CentreAnna UniversityChennaiIndia

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