Synthesis and properties of p-si/n-cd1−xagxo heterostructure for transparent photodiode devices

Mannarsamy Anitha, Karuppiah Deva Arun Kumar, Paolo Mele, Nagarajan Anitha, Karunamoorthy Saravanakumar, Mahmoud Ahmed Sayed, Atif Mossad Ali, Lourdusamy Almalraj

Research output: Contribution to journalArticlepeer-review

Abstract

We developed silver-doped Cd1xAgxO thin films (where x = 0, 0.01, 0.02, 0.03 and 0.04) on amorphous glass substrate by an automated nebulizer spray pyrolysis set-up. The XRD patterns show rock salt cubic crystal structures, and the crystallite sizes vary with respect to Ag doping concentrations. SEM images exhibited a uniform distribution of grains with the addition of Ag; this feature could support the enhancement of electron mobility. The transmittance spectra reveal that all films show high transmittance in the visible region with the observed bandgap of about 2.40 eV. The room temperature photoluminescence (PL) studies show the increase of near-band-edge (NBE) emission of the films prepared by different Ag doping levels, resulting in respective decreases in the bandgaps. The photodiode performance was analyzed for the fabricated p-Si/n-Cd1xAgxO devices. The responsivity, external quantum efficiency and detectivity of the prepared p-Si/n-Cd1xAgxO device were investigated. The repeatability of the optimum (3 at.% Ag) photodiode was also studied. The present investigation suggests that Cd1xAgxO thin films are the potential candidates for various industrial and photodetector applications.

Original languageEnglish
Article number425
JournalCoatings
Volume11
Issue number4
DOIs
Publication statusPublished - 2021

Keywords

  • CdAgO thin films
  • P-Si/n-Cd–AgO
  • PL
  • Photodiode

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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