Microstructural, optical, photoluminescence and electrical studies of electrosynthesized S@MnO2 composite film for photosensing and optoelectronic applications

Saheed A. Adewinbi*, Vusani M. Maphiri, Lukman O. Animasahun, Yetunde A. Ajayeoba, Abdulmajeed Abdullah Alayyaf, S. K. Mosa, M. A. Tijani, Haekyoung Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this report, we have prepared sulfurized MnO2 thin film, MnxS1-xO (0.0 ≤x≤0.1) with the aid of a simple electrodeposition process. A systematic study on their microstructure, optoelectronic and photoluminescence properties has been performed. X-ray diffractometery study unveiled the formation of tetragonal and cubic phases of α-MnO2 and MnS, respectively with some traces of S-nanoparticles. Successful incorporation of S-atom and phase composition of the samples were also reaffirmed with the aid of energy dispersive x-ray and Raman spectroscopic measurements. Optical measurements of the samples revealed the sulfurization influences on the transparency and darkness of the deposited MnO2 host film, confirming the dopant's modulation of the host's surface and internal microstructure. It also showcased its impacts on the modulation of the host films' band structure (band gap range: 3.5–4.3 eV) for optoelectronic response tailoring. Photoluminescence spectroscopy measurement of the samples revealed varying intrinsic defect states resulting into deep level photoemissions attributable to the display of a strong emission peak, each at the UV and the visible regions of the spectrum. It also unveiled the tailoring of oxygen vacancy concentration and optoelectronic state of MnO2 with S-incorporation. The study on UV sensing reveals that the sulfurized MnO2 thin film-based photodetector can possess values of photosensitivity (65 %), responsivity (2.85⨯10−2 AW− 1) external quantum efficiency (12 %), and detectivity (2.87⨯108 Jones). Additionally, a potential mechanism for ultraviolet photodetector performance is unveiled in the work.

Original languageEnglish
Article number114988
JournalOptical Materials
Volume149
DOIs
Publication statusPublished - Mar 2024
Externally publishedYes

Keywords

  • Electrosynthesis
  • I–V characteristics
  • Optoelectronic
  • Photoluminescence
  • Photosensing
  • Sulfurized MnO

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