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Characterization of PbWO4 thin films formed by the pulsed laser welding technique

Authors :
Latifah Hamad Khalid Alfhaid
A.F. Qasrawi
Hazem K. Khanfar
İstinye Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Elektrik-Elektronik Mühendisliği Bölümü
Atef Fayez Qasrawi / 0000-0001-8193-6975
Qasrawi, Atef Fayez
Atef Fayez Qasrawi / R-4409-2019
Atef Fayez Qasrawi / 6603962677
Source :
Materials Today Communications. 35:106157
Publication Year :
2023
Publisher :
Elsevier BV, 2023.

Abstract

within couple of seconds in an argon atmosphere. Thin films of Pb (100 nm)/WO3 (500 nm) were deposited by the thermal evaporation technique under a vacuum pressure of 10−5 mbar. The films were then exposed to a pulse laser beam of fixed amplitude and variable pulse width (0.1–10 ms). The produced films were characterized by means of X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and optical spectrophotometry techniques. An almost pure phase (~90%) of tetragonal PbWO4 was achieved after the pulse width exceeds 5.0 ms. PbWO4 thin films produced by the PLW technique exhibited a direct and indirect energy band gaps of 2.27 eV and 3.52 eV, respectively. Energy band tails of widths of 1.35 eV were found dominant in these films. In addition fitting of the dielectric resonance spectra for Pb/WO3 and PbWO4 thin films indicated that the formation of PbWO4 was accompanied with a decrease in the high frequency dielectric constant, a decrease in the free hole concentration and an increase in the electronic friction in the films. The fast method of obtaining PbWO4 thin films and the formation of the direct band gap being 2.27 eV together with the nonlinear dielectric and optical properties make the PbWO4 films obtained by the PLW technique suitable for optoelectronic technology

Details

ISSN :
23524928
Volume :
35
Database :
OpenAIRE
Journal :
Materials Today Communications
Accession number :
edsair.doi.dedup.....a3c50f594a5de2cee34e3f53538bae1c
Full Text :
https://doi.org/10.1016/j.mtcomm.2023.106157