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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/039/06/1453-1460

    • Keywords

       

      Lead iodide thin films; spin coating; structure and morphology; XRD; Raman spectrum.

    • Abstract

       

      In this study, lead iodide (PbI$_2$) thin films were deposited on glass substrates by spin coating a solution of 0.2 M PbI$_2$ dissolved in dimethylformamide, varying the deposition time and the spin speed. The thickness of the thin films decreased with increase in spin speed and deposition time, as examined by profilometry measurements.The structure,morphology, optical and electrical properties of the thin films were analysed using various techniques. X-ray diffraction patterns revealed that the thin films possessed hexagonal structures. The thin films were grown highly oriented to [001] direction of the hexagonal lattice. Raman peaks detected at 96 and 136 cm$^{-1}$ were corresponding to the characteristic vibration modes of PbI$_2$. The X-ray photoelectron spectroscopy detected the presence of Pb and I with core level binding energies corresponding to that in PbI2. Atomic force microscopy showed smooth and compact morphology of the thin films. From UV–Vis transmittance and reflectance spectral analysis, the bandgap of the thin films $\sim$2.3 eV was evaluated. The dark conductivity of the thin films was computed and the value decreased as the deposition time and spin speed increased.

    • Author Affiliations

       

      D ACUÑA1 B KRISHNAN1 2 S SHAJI1 2 S SEPÚLVEDA1 2 J L MENCHACA3

      1. Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Nuevo León 66455, México
      2. Universidad Autónoma de Nuevo León, Centro de Innovación, Investigación y Desarrollo de Ingeniería y Tecnología, Apodaca, Nuevo León 66600, México
      3. Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Nuevo León 66455, México

    • Dates

       
      Published
      15 October 2016
      Manuscript received
      19 July 2015
      Accepted
      21 March 2016

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

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      Posted on July 25, 2019

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