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Single source precursor for vacuum evaporation of MoBi2Se5 photoactive thin films

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Abstract

In this paper, we report a new approach for deposition of nanocrystalline MoBi2Se5 thin films using vacuum evaporation employing single source precursor synthesized by arrested precipitation technique. As deposited and vacuum annealed MoBi2Se5 thin films were characterized for opto-structural, morphological, compositional and electrochemical analysis. It was observed that optical band gap decreases from 2.07 eV to 1.87 eV with vacuum annealing. X-ray diffraction studies confirm rhombohedral crystal structure of MoBi2Se5 thin films. Scanning electron microscopy images show compact arrangement of spherical grains without pin holes. Transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) results reveal nanocrystalline nature having particle size ~100 nm and selected area electron diffraction (SAED) pattern confirms rhombohedral crystal structure. The compositional analysis done by XPS shows presence of Mo4+, Bi3+ and Se2− oxidation states confirming stoichiometric MoBi2Se5 thin film material. The photoelectrochemical (PEC) parameters of as deposited and vacuum annealed thin films were recorded in 0.5 M aqueous polysulfide electrolyte. Our PEC results show that 0.57 and 0.70 % conversion efficiency for as-deposited and vacuum annealed samples respectively.

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Acknowledgments

Authors are thankful to University Grants Commission (UGC), New Delhi for providing infrastructural facilities. This work was also supported by the Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009–0094055).

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Authors and Affiliations

  1. Materials Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, 416 004, MH, India

    Suhas S. Mohite, Rohini R. Kharade & Popatrao N. Bhosale

  2. Department of Advanced Chemical Engineering, Chonnam National University, Gwangju, 500 757, South Korea

    Sawanta S. Mali & Chang Kook Hong

  3. Bharati Vidyapeeth University, Katraj, Pune, 441 046, MH, India

    Suhas S. Mohite & Dhanaji G. Kanase

  4. Thin Film Materials Laboratory, Department of Physics, Shivaji University, Kolhapur, 416 004, MH, India

    Pramod S. Patil

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  1. Suhas S. Mohite
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Correspondence to Popatrao N. Bhosale.

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Mohite, S.S., Mali, S.S., Kharade, R.R. et al. Single source precursor for vacuum evaporation of MoBi2Se5 photoactive thin films. J Mater Sci: Mater Electron 26, 2879–2886 (2015). https://doi.org/10.1007/s10854-015-2772-2

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  • DOI: https://doi.org/10.1007/s10854-015-2772-2

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