Sol-gel deposited nickel oxide films for electrochromic applications

E. Ozkan Zayim*, I. Turhan, F. Z. Tepehan, N. Ozer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

98 Citations (Scopus)

Abstract

The electrochromic (EC) behavior, the microstructure, and the morphology of sol-gel deposited nickel oxide (NiOx) coatings were investigated. The films were produced by spin and dip-coating techniques on indium tin oxide (ITO)/glass and Corning glass (2947) substrates. The coating solutions were prepared by reacting nickel(II) 2-ethylhexanoate as the precursor, and isopropanol as the solvent. NiOx was heat treated at 350 °C for 1 h. The surface morphology, crystal structure, and EC characteristics of the coatings were investigated by scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), atomic force spectroscopy (AFM), X-ray diffractometry (XRD), and cyclic voltammetry (CV). SEM and AFM images revealed that the surface morphology and surface characteristics of the spin- and dip-coated films on both types of substrate were different. XRD spectra revealed that both films were amorphous, either on ITO or Corning glass substrates. CV showed a reversible electrochemical insertion or extraction of the K+ ions, cycled in 1 M KOH electrolyte, in both type of film. The crystal structure of the cycled films was found to be XRD amorphous. Spectroelectrochemistry demonstrated that dip-coated films were more stable up to 1000 coloration-bleaching cycles, whereas spin-coated films gradually degraded after 500 cycles.

Original languageEnglish
Pages (from-to)164-169
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume92
Issue number2
DOIs
Publication statusPublished - Feb 2008

Funding

The authors would like to thank Prof. Dr. Mustafa Ürgen and Prof. Dr. A. Gul for SEM and spectoelectrochromic measurements and The State Planning Organization (DPT) for financial support of this research.

FundersFunder number
DPT
Devlet Planlama Örgütü

    Keywords

    • Electrochromism
    • Nickel oxide
    • Sol-gel processing
    • Surface morphology

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