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SUMMARY:Small-polaron hopping in amorphous tungsten oxide films
LOCATION:Virtual Seminar
TZID:America/Denver
DTSTART:20201203T160000
UID:2026-04-24-04-59-59@natsci.colostate.edu
DTSTAMP:20260424T045959
Description:Literature Seminar\n\nTungsten trioxide has garnered interest f
 or applications in energy efficient materials. Reversible\nelectrochromism
  resulting in optical modulation makes tungsten trioxide a prime candidate
  for smart\nwindows and digital displays. Optical modulation in transition
  metal oxides (TMOs) is often attributed to\ncation insertion\; however\, 
 the physical mechanism responsible for these optical changes has not been\
 ndescribed precisely in literature. Understanding the mechanism of optical
  modulation in electrochromic\nTMOs would provide precise tuning of optica
 l properties improving functionality. To advance the field of\nelectrochro
 mic materials and to gain quantitative knowledge about optical absorption 
 in TMOs\, a\ndiscussion of polaron hopping is necessary. The absorbance of
  energy attributed to polaron hopping is\ncomputed by accounting for the e
 lectronic transition between adjacent atoms in a material with\nlocalized 
 electron density. To characterize the optical absorbance in amorphous tung
 sten oxide\, Triana\net al.(1) analyzed experimental spectra of oxygen def
 icient and lithiated films\, calculated refractive index\nand extinction c
 oefficients\, computed the complex dielectric function and optical conduct
 ivity\, and\naccurately modeled the effect of small-polaron hopping on the
  magnitude of optical absorbance. They\nconcluded that the observed optica
 l change from transparent to dark blue amorphous tungsten oxide\nfilms due
  to the absorption of infrared and visible light was responsible for incre
 asing optical\nconductivity and is a result of polaron hopping. Triana et 
 al.’s approach can be applied to other TMOs to\ncharacterize optical mod
 ulation of small-polaron hopping.\n(1) Triana\, C. A.\; Granqvist\, C. G.\
 ; Niklasson\, G. A. Electrochromism and small-polaron hopping in oxygen\nd
 eficient and lithium intercalated amorphous tungsten oxide films. J. Appl.
  Phys. 2015\, 118\, 024901.\nhttps://doi.org/10.1063/1.49\n\nZoom Link 4:0
 0 pm
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