biostudies-literatureWang RChinese Academy of SciencesNational Natural Science Foundation of ChinaNational Key Research and Development Program of China18241-18245https://www.ebi.ac.uk/biostudies/studies/S-EPMC9033434biostudies-literatureUnknown11(30)In this work, we demonstrate that a Ta/TaO _<i>x</i> /Ru device can act as both a highly uniform and nonlinear selection device and a stable resistive switching device, respectively, by controlling the voltage applied to the Ta electrode. As a selection device, it shows high selectivity (10³), high current density (25 kA cm^-2), very low variation, and good endurance. The non-linear performance of the device may be attributed to a trapezoidal band structure modulated by the concentration gradient of oxygen vacancies. Furthermore, with a large voltage bias on the Ta electrode, a repeatable and stable resistive switching behavior was observed, which could be attributed to the formation of conductive filaments probably composed of Ta metal and oxygen vacancies. RSC advancesA dual-functional Ta/TaO _<i>x</i> /Ru device with both nonlinear selector and resistive switching behaviors.PMC90334342018AAA0103300U20A2022061804171XDB44000000Wu ZWang RZhang XLiu QShi TfalseA dual-functional Ta/TaO _<i>x</i> /Ru device with both nonlinear selector and resistive switching behaviors.In this work, we demonstrate that a Ta/TaO _<i>x</i> /Ru device can act as both a highly uniform and nonlinear selection device and a stable resistive switching device, respectively, by controlling the voltage applied to the Ta electrode. As a selection device, it shows high selectivity (10³), high current density (25 kA cm^-2), very low variation, and good endurance. The non-linear performance of the device may be attributed to a trapezoidal band structure modulated by the concentration gradient of oxygen vacancies. Furthermore, with a large voltage bias on the Ta electrode, a repeatable and stable resistive switching behavior was observed, which could be attributed to the formation of conductive filaments probably composed of Ta metal and oxygen vacancies. 2021-01-01T00:00:00Z2021 May2025-04-20T03:08:03.84Z2025-04-20T03:08:03.84ZS-EPMC90334343548094810.1039/d1ra02350k