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Improved ultraviolet sensing, photo-stabilized visible transmission, and electrical conductance in Zn1−xGax/2Fex/2O

Published online by Cambridge University Press:  19 May 2020

Prashant Kumar Mishra ,
Aditya Dash  and
Somaditya Sen
Prashant Kumar Mishra
Affiliation:
Discipline of Physics, Indian Institute of Technology, Indore 453552, India
Aditya Dash
Affiliation:
Department of Physics and Astronomy, National Institute of Technology Rourkela, Odisha 769008, India
Somaditya Sen*
Affiliation:
Department of Electronic Engineering and Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City 243, Taiwan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Zn1−xGax/2Fex/2O (x= 0, 0.0156, 0.0312) represents the polycrystalline hexagonal (wurtzite) phase with a space group P63mc synthesized using the sol–gel technique. A comparative study and investigation of structural, optical, and photo-sensing properties of these samples were performed. Structural and vibrational studies show enhancement in the crystallinity of the codoped samples. Optical band gap increases from ∼3.21 to 3.24 eV with substitution because of the improved crystallinity. The photoluminescence properties show modification from yellowish green for x= 0 to a more distinct green for x= 0.0156. The intensity of the luminescence decreases with doping, indicating an overall reduction of defects in the band gap helping the material to become more transparent to visible light. Photocurrent and photosensitivity are modified with the illumination wavelength (290, 450, 540 and 640 nm) with codoping. Sensitivity toward visible lights reduced with codoping. On the other hand, it is more sensitive to ultraviolet light. It indicates the material becomes more transparent for visible light and may be used as photostable device.

Keywords

band gapurbach energyoxygen vacanciesphotocurrentvisible light sensing
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 10 , 28 May 2020 , pp. 1329 - 1336
Copyright
Copyright © Materials Research Society 2020

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