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Novel Nd-doping effect on structural, morphological, optical, and electrical properties of facilely fabricated PbI2 thin films applicable to optoelectronic devices

  • Mohd. Shkir
  • Mohd Taukeer Khan
  • S. AlFaifyEmail author
Original Article
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Abstract

Lead iodide is one of the best room temperature radiation detector including applications in solar cell and photodetectors. Herein, we have fabricated the high-quality thin films of pure and Nd:PbI2 through a simple and cost-effective spin-coating route and investigated their key properties. X-ray diffraction study confirms the growth orientation of all films along c-axis/(001) plane and single phase of 2H-PbI2 Polytypes with the crystallites of size in range of 21–31 nm. Further confirmation of growth and phase was carried out through FT-Raman analysis. EDX and SEM mapping was also carried out to confirm the Nd doping and its homogeneity in the films. SEM provides a clear view on the surface morphology of grown films and grain size was found in the range of 54–71 nm. Optical measurement shows high transparency, i.e., ~ 90% for grown films in visible to NIR region. The direct bandgap is observed to be enhanced with Nd doping from 2.45 to 2.58 eV; however, there is another bandgap which shows reduction with doping from 2.30 to 2.24 eV. This shows the possibility of existence of sub-energy bandgap in PbI2. The stable value of refractive index is evaluated ~ 2. The value of εʹ is found to varies from 4 to 27 in the energy range of 1–2.5 eV. Optical limiting behavior of all films was also studied at two lasers of λ = 532 nm and 632.8 nm. Moreover, a device fabrication was done for electrical study and found the resistivity increases from 5.14 × 108 Ω-cm for pure to 1.18 × 109 Ω-cm for 5% Nd-doped PbI2.

Keywords

Semiconductor X-ray diffraction Vibrational spectroscopy SEM/EDX Optical properties Electrical properties 

Notes

Acknowledgements

The authors would like to express their gratitude to Deanship of Scientific Research at King Khalid University for funding this work through Research Groups Program under Grant No. R.G.P. 1/37/40.

Compliance with ethical standards

Conflict of interest

Authors declare that there is no conflict of interest in the current work.

Supplementary material

13204_2019_983_MOESM1_ESM.pdf (406 kb)
Supplementary material 1 (PDF 406 KB)

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Copyright information

© King Abdulaziz City for Science and Technology 2019

Authors and Affiliations

  1. 1.Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, College of ScienceKing Khalid UniversityAbhaSaudi Arabia
  2. 2.Department of Physics, Faculty of ScienceIslamic University of MadinahMadinahSaudi Arabia

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