Microwave-assisted synthesis of Mg:PbI2 nanostructures and their structural, morphological, optical, dielectric and electrical properties for optoelectronic technology

doi:10.1088/1674-1056/aba60e

Abstract

This work reports the cost-effective growth of Mg:PbI₂ nanostructures with 0, 1, 2.5 and 5.0 wt.% Mg doping concentrations. Structural, vibrational, morphological properties are analyzed using x-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM). XRD and Raman studies confirm the monophasic hexagonal system of Mg:PbI₂, and no additional impurity peaks are detected. The Scherrer formula is used to determine sizes of crystallites to be in the range of 47–52 nm. EDX/SEM e-mapping analyses confirm the incorporation of Mg in PbI₂ matrix and its uniform distribution throughout the sample. The hexagonal nanosheet- and nanoplate-like morphologies are detected in SEM images for pure and Mg-doped PbI₂. An optical band gap of nanostructures is obtained from Tauc’s relation to be in the range 3.0–3.25 eV. Dielectric and electrical properties are found in significant enhancement as Mg doping in PbI₂ matrix, also the conduction mechanism is discussed.

Keywords: Mg:PbI₂ nanostructures structural properties optical band gap dielectric constant ac conductivity

Received: 23 May 2020
Revised: 07 July 2020
Accepted manuscript online: 15 July 2020

Fund: the Deanship of Scientific Research at King Khalid University (Grant No. R.G.P1/207/41), the Deanship of Scientific Research at Princess Nourah bint Abdulrahman University through the Fast-track Research Funding Program, and Deanship of Research, University of Hail.

Corresponding Authors: ^†Corresponding author. E-mail: shkirphysics@gmail.com

Cite this article:

Mohd. Shkir, Ziaul Raza Khan, T Alshahrani, Kamlesh V. Chandekar, M Aslam Manthrammel, Ashwani Kumar, and S AlFaify$ Microwave-assisted synthesis of Mg:PbI₂ nanostructures and their structural, morphological, optical, dielectric and electrical properties for optoelectronic technology 2020 Chin. Phys. B 29 116102

Fig. 1.

(a) As-recorded XRD patterns, (b) close view of the (001) peak, (c)–(f) Rietveld refined XRD patterns for pure and Mg-doped PbI₂ nanostructures.

Table 1.

Refined structural constraints for all Mg:PbI₂ by POWDERX software and Rietveld refinement processes.

Fig. 2.

FT-Raman spectra for pure and Mg-doped PbI₂.

Fig. 3.

EDX spectra with composition and (b) SEM e-mapping images for 2.5 wt.% Mg:PbI₂.

Fig. 4.

SEM micrographs for pure and Mg-doped PbI₂.

Fig. 5.

(a) Absorbance plot and (b) Tauc’s plot for Mg:PbI₂.

Fig. 6.

Graphics for (a) ε′ vs ln ω, (b) ε″ vs ln ω, and (c) ω_ac vs ln ω for all Mg:PbI₂ samples.

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Microwave-assisted synthesis of Mg:PbI2 nanostructures and their structural, morphological, optical, dielectric and electrical properties for optoelectronic technology

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Microwave-assisted synthesis of Mg:PbI₂ nanostructures and their structural, morphological, optical, dielectric and electrical properties for optoelectronic technology