Electrochromic W(1-x-y)Ti(x)lo(y)O(3) Thin Films Made by Sputter Deposition: Large Optical Modulation, Good Cycling Durability, and Approximate Color Neutrality
2017 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 29, no 5, 2246-2253 p.Article in journal (Refereed) Published
Tungsten oxide thin films are used in electrochromic devices such as variable-transmittance "smart windows" for energy efficient buildings with good indoor comfort. Two long-standing issues for WO3 thin films are their limited durability under electrochemical cycling and their blue color in transmission. Here, we show that both of these problems can be significantly alleviated by additions of titanium and molybdenum. We found that similar to 300 nm-thick films of sputter deposited W1-x-yTixMoyO3 are able to combine a midluminous transmittance modulation of 0.4 similar to 70% with good color neutrality and durability under extended electrochemical cycling. The Ti content should be similar to 10 at. % in order to achieve durability without impairing transmittance modulation significantly, and the Mo content preferably should be no larger than 6 at. % in order to maintain durability. Hence, our results give clear guidelines for making three-component mixed-oxide thin films that are suitable for electrochromic "smart windows".
Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 29, no 5, 2246-2253 p.
Physical Sciences Chemical Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-319529DOI: 10.1021/acs.chemmater.6b05198ISI: 000396639400039OAI: oai:DiVA.org:uu-319529DiVA: diva2:1087286
FunderEU, FP7, Seventh Framework Programme, 267234