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^*

来源：Physical Review Applied, 2018, 10(3): 034004.

DOI：10.1103/PhysRevApplied.10.034004

• ELECTRICAL-TRANSPORT PROPERTIES
• 1/F NOISE
• TRANSITION-TEMPERATURE
• OXYGEN VACANCIES
• GATE ELECTRODES
• SURFACE
• IRO2

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.

• 出版日期2018-9-5
• 单位天津大学