Electrochromism in Nb‐V and Cr‐V Mixed‐Oxides

Abstract

The electrochromic behavior of reactively sputtered mixed‐oxide films of Nb‐V and Cr‐V has been characterized for the Li insertion reaction. Spectral coloration efficiency measurements from 300 to 1650 nm show that Nb‐V oxides exhibit anodic coloration in the near‐UV and weak cathodic coloration from 400 to 600 nm. Cr‐V oxides show weak anodic coloration in the 300 to 700 nm spectral region. Both Nb‐V and Cr‐V mixed oxides are electrochromically inactive in the near‐infrared. Variable transmittance electrochromic devices based on combinations of or with (a = amorphous) have been fabricated and their optical switching characterized.