TITLE

Structural transformation induced changes in the optical properties of nanocrystalline tungsten oxide thin films

AUTHOR(S)
Gullapalli, S. K.; Vemuri, R. S.; Ramana, C. V.
PUB. DATE
April 2010
SOURCE
Applied Physics Letters;4/26/2010, Vol. 96 Issue 17, p171903
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Nanocrystalline tungsten oxide (WO3) films were grown by reactive magnetron sputter-deposition. The structure and optical properties of WO3 films were evaluated using grazing incidence x-ray diffraction and optical spectroscopic measurements. The effect of ultramicrostructure was significant on the optical characteristics of WO3 films. The band gap decreases from 3.25 to 2.92 eV with increasing grain-size from ∼9 to 50 nm while the films exhibit a transition from monoclinic to tetragonal phase. A direct microstructure-property relationship found suggests that tuning properties of WO3 films for desired applications can be achieved by tuning the conditions and controlling the phase.
ACCESSION #
50173963

 

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