Electrical transport, microstructure and optical properties of Cr-doped In2O3 thin film prepared by sol-gel method

H. Baqiah, Noor Baa`Yah Ibrahim, M. H. Abdi, S. A. Halim

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

High transparent In2O3 and Cr-doped In 2O3 (In2-xCrxO3) nanocrystalline thin films were prepared using a simple sol-gel method followed by a spin coating technique. The effect of Cr concentration on the structural, microstructure, electrical and optical properties of In2-xCr xO3 were systematically investigated using X-ray diffractometer (XRD), atomic force microscopy (AFM), UV-vis spectroscopy, field emission scanning electron microscopy (FESEM) and Hall effect technique. The films have good crystallization with preferred orientation to (222) direction. The lattice parameters, a, of In2O3 system increased at lowest dopants (x = 0.025) and decreased as the dopant was further increased. The optical transmittance of films increased up to 98% for x = 0.05 and decreased for further Cr concentrations. From AFM measurement the films nanocrystals morphology was depending on Cr concentrations. The band gap was around 3.76 eV for pure and with x 6 0.075 however it increased. The effect of Cr concentrations on conducting mechanisms of In2O3 film has been investigated from 80 to 300 K using thermal activated conduction band and hopping models. The films, at x = 0.0-0.075, have typical semiconductor behaviour. Three different conducting mechanisms have been estimated. All thermal activation energies and conduction hopping parameters have been determined and analysed in details.

Original languageEnglish
Pages (from-to)198-206
Number of pages9
JournalJournal of Alloys and Compounds
Volume575
DOIs
Publication statusPublished - 2013

Fingerprint

Sol-gel process
Optical properties
Thin films
Microstructure
Atomic force microscopy
Doping (additives)
Coating techniques
Opacity
Hall effect
Diffractometers
Spin coating
Crystallization
Conduction bands
Ultraviolet spectroscopy
Crystal orientation
Field emission
Nanocrystals
Lattice constants
Electric properties
Energy gap

Keywords

  • Conducting mechanism
  • Hopping conductivity models
  • Indium oxide
  • Porosity
  • Sol-gel
  • Transmittance

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Electrical transport, microstructure and optical properties of Cr-doped In2O3 thin film prepared by sol-gel method. / Baqiah, H.; Ibrahim, Noor Baa`Yah; Abdi, M. H.; Halim, S. A.

In: Journal of Alloys and Compounds, Vol. 575, 2013, p. 198-206.

Research output: Contribution to journalArticle

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