Enhancement of temperature-modulated NbO2-based relaxation oscillator via interfacial and bulk treatments

Autor:	Jia Min Ang, Putu Andhita Dananjaya, Samuel Chen Wai Chow, Gerard Joseph Lim, Chim Seng Seet, Wen Siang Lew
Rok vydání:	2023
Předmět:	Mechanics of Materials Mechanical Engineering General Materials Science Bioengineering General Chemistry Electrical and Electronic Engineering
Zdroj:	Nanotechnology. 34:185202
ISSN:	1361-6528 0957-4484
Popis:	This work demonstrates oscillation frequency modulation in a NbO2-based relaxation oscillator device, in which the oscillation frequency increases with operating temperature and source voltage, and decreases with load resistance. An annealing-induced oxygen diffusion at 373 K was carried out to optimize the stoichiometry of the bulk NbO2 to achieve consistent oscillation frequency shift with device temperature. The device exhibits stable self-sustained oscillation in which the frequency can be modulated between 2 and 33 MHz, and a wider operating voltage range can be obtained. An additional surface treatment step was employed during fabrication to reduce the surface roughness of the bottom electrode and to remove surface contaminants that affect the interfacial properties of the device. The device frequency tunability coupled with high oscillating frequency and high endurance capability of more than 1.5 × 108 cycles indicates that the Pt/NbO2/Pt device is particularly suitable for applications in an oscillatory neural network.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b64e150c22870e932d6c050a233bf4ea https://doi.org/10.1088/1361-6528/acb778 Zobrazit plný text záznamu