作者
Nurul Hanis Azhan, Kui Su, Kunio Okimura, Joe Sakai
发表日期
2015/5/14
期刊
Journal of Applied Physics
卷号
117
期号
18
出版商
AIP Publishing
简介
Comprehensive studies have been performed on the effects of radio frequency (rf) substrate biasing on insulator–metal transition (IMT) properties of VO 2 thin films grown on Al 2 O 3 (001) substrates. As the rf substrate bias power increased, the ion energy during deposition increased, inducing a strong in-plane stress conversion and a modification of the rutile c-axis (c R-axis) length in the VO 2 films. The reduced c R-axis length significantly lowered the IMT temperature. Increased IMT sharpness via improved crystallinity was obtained with rf substrate biasing at an appropriate power. Temperature coefficient of resistance at room temperature was comparable with reported values for impurity-doped VO 2 films. Thus, the rf substrate biasing during reactive sputtering has great potential to control stress in thin films, which could finally control the IMT in oriented VO 2 films.
引用总数
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