標題: Activation Energy Distribution of Dynamical Structural Defects in RuO2 Films
作者: Yeh, Sheng-Shiuan
Gao, Kuang Hong
Wu, Tsung-Lin
Su, Ta-Kang
Lin, Juhn-Jong
交大名義發表
電子物理學系
物理研究所
National Chiao Tung University
Department of Electrophysics
Institute of Physics
公開日期: 5-Sep-2018
摘要: Ruthenium dioxide (RuO2) is an important metal widely used in nanoelectronic devices. It plays indispensable roles in applications such as catalysts and supercapacitors. A good understanding of the origin of the flicker or 1/f noise in RuO2 will advance the design and efficiency of these applications. We demonstrate in a series of sputtered RuO2 polycrystalline films that the 1/f noise originates from fluctuating oxygen vacancies which act as dynamical structural defects, i.e., moving scattering centers. Reducing the number of oxygen vacancies by adjusting thermal annealing conditions significantly reduces the noise magnitude gamma, the Hooge parameter. We quantify the activation energy distribution function, g(E), and calculate the oxygen vacancy density, n(TLS), from the measured gamma value. We show that g(E) can be explicitly expressed in terms of gamma(T) and the electronic parameters of the metal, where T denotes temperature. The inferred n(TLS) value is in line with the oxygen content determined from the x-ray photoelectron spectroscopy studies.
URI: http://dx.doi.org/10.1103/PhysRevApplied.10.034004
http://hdl.handle.net/11536/148092
ISSN: 2331-7019
DOI: 10.1103/PhysRevApplied.10.034004
期刊: PHYSICAL REVIEW APPLIED
Volume: 10
Appears in Collections:Articles