Continued investigation into the spinel nickel-cobalt oxide system.
EMSL Project ID
2525a
Abstract
Past work with the nickel cobalt oxide thin films has yielded new and interesting data with respect to the nature of charge motion and the charge distribution within the spinel lattice. The nickel cobalt oxide spinel films are of interest because of their infrared transparency and relatively high conductivity as a p-type majority carrier material conducting by a polaron hopping mechanism. Investigation into this system will involve substitution of additional impurities into the lattice. Sputter deposited nickel cobalt oxide films will be substituted with rhodium and palladium and analyzed for changes in conductivity and transparency. Finding the optimal film deposition conditions for high conductivity and high transparency will be the goal of this work. A high conductivity, greater than 500 S cm^2 at a thickness of > 100nm, is desirable to allow practical use of the film as a device electrode. Additionally, optical transmission greater than 70% is necessary to promote high device efficiency. Work will include sample preparation and analysis including crystal phase, oxidation state, film thickness, and composition. Film structural and chemical properties will be related to the film optical properties such as transparency and index of refraction.
Project Details
Project type
Exploratory Research
Start Date
2004-02-26
End Date
2005-03-03
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Owings RR, PH Holloway, GJ Exarhos, and CF Windisch, JR. 2004. "The effect of annealing and lithium substitution on conductivity in nickel cobalt oxide spinel films." Presented by Robert Owings at 26th Annual Sumposium on Applied Surface Analysis, Richland, WA on June 18, 2004. PNNL-SA-41822.