Mechanism of electrochromism for amorphous WO sub 3 thin films

Journal Article · Tue Jan 15 04:00:00 EST 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347335· OSTI ID:6226524

Hashimoto, S; Matsuoka, H ^[1]

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1. Steel Research Center, NKK Corporation, Minamiwatarida 1 -1, Kawasaki, Kanagawa 210, Japan (JP)

The mechanism of electrochromism for an amorphous WO{sub 3} film has been studied. The film was prepared by using vacuum evaporation. X-ray phototelectron spectroscopy analysis has revealed that a state appears below the Fermi level after coloration in a LiClO{sub 4}-propylene carbonate electrolyte and that the Fermi level increases in proportion to the amount of injected lithium. In addition, a decrease in the density of state of the conduction band has been observed in a colored film by using electron energy loss spectroscopy analysis in transmission electron microscopy. It has been concluded that the electrons injected occupy the conduction band after coloration and that electrochromism of amorphous WO{sub 3} film is due to an intraband transition between an electron injected in the conduction band and an empty state.

• OSTI ID: 6226524
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:2; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
AMORPHOUS STATE
CHALCOGENIDES
COATINGS
ELECTRO-OPTICAL EFFECTS
ELECTROCHROMISM
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
FILMS
IONIZING RADIATIONS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
VAPOR DEPOSITED COATINGS
X RADIATION