As-Sputtered Electrochromic Films of Nickel Oxide

Publication Type

Journal Article

Date Published

02/1991

LBNL Report Number

LBL-30066

Abstract

Electrochromic nickel oxide films were deposited by radio-frequency magnetron sputtering of a Ni target in gas mixtures of Ar and O2. When electrochemically cycled in 0.1 N KOH solution, large reversible changes in visible absorption were obtained within the first 10 bleach/color cycles. Films which showed the greatest changes in optical properties and charge capacity were produced within a narrow range of oxygen flow rates. The coloration efficiency was found to be insensitive to the sputtering conditions and stoichiometry, with a value of 34+-4 cm2C-1 at 550 nm. This indicates that microstructure and charge capacity determine the absorption coefficient. The reaction rate was found to depend on the concentration of OH- in the electrolyte, indicating that OH- diffusion in the electrolyte limits the rate of reaction.

Journal

Journal of Vacuum Science Technology A

Volume

9

Year of Publication

1991

Short Title

J. Vac. Sci. Technol. A

Pagination

2170-2173
2170

Issue

4

ISSN

0734-2101