Temperature-Dependent Conversion of Digital to Analog Resistive Switching Behavior in Metal-Oxide-Semiconductor Devices

Researchers at the Saha Institute of Nuclear Physics in India have discovered a novel temperature-dependent conversion from digital to analog resistive switching behavior in metal-oxide-semiconductor devices with TiO2 and Si as the gate oxide and substrate, respectively. This breakthrough was achieved through the use of rf sputtering of TiO2 target at room temperature and subsequent analysis of I-V and high-frequency capacitance-voltage properties from room temperature to 200°C. The study proposes a model to explain the change in resistive switching nature with temperature, which may have significant implications for the development of advanced electronic devices.

Key Takeaways:

• Researchers observed a change in the nature of resistive switching behavior of the devices from digital to analog with increasing measurement temperature.
• The digital switching behavior appears beyond a certain temperature (150°C), due to the alignment of energized oxygen vacancies.
• With further rise in temperature, a redistribution of vacancies takes place, responsible for the creation of multiple conducting pathways, leading to a change in the nature into analog one.
• The high-frequency capacitance-voltage data shows highest accumulation capacitance at room temperature due to the presence of maximum number of oxygen vacancies.
• The capacitance lowers down significantly at 50°C and again starts increasing at 100°C and maintains the rising trend up to 200°C.
• This phenomenon may be explained on the basis of temperature-dependent reaction of oxygen vacancy with carbon impurities present in the device.
• The research has been peer-reviewed and published in Physica B: Condensed Matter.
• The study proposes a model to explain the change in resistive switching nature with temperature.
• The findings of this research may have significant implications for the development of advanced electronic devices.

Statistics:

• 10-nm-thick TiO2 thin-films were deposited on n-type Si (100) substrates using rf sputtering of TiO2 target at room temperature.
• The I-V data shows a change in nature of resistive switching behavior of the devices from digital to analog with increasing measurement temperature.
• The change in temperature range for the appearance of digital switching behavior was observed to be between 150°C to 200°C.
• The highest accumulation capacitance was observed at room temperature, which lowers down significantly at 50°C and again starts increasing at 100°C and maintains the rising trend up to 200°C.

Sources:

• VerticalNews, "Temperature Dependent Conversion From Digital To Analog Resistive Switching Behavior of Rf Sputtered Tio2-x Thin-film-based Metal-oxide-semiconductor Devices." Physica B-condensed Matter, 2025; 715.
• Saha Institute of Nuclear Physics, 1-Af Bidhannagar, Kolkata 700064, West Bengal, India.
• Supratic Chakraborty, Saha Institute of Nuclear Physics, 1-Af Bidhannagar, Kolkata 700064, West Bengal, India.
• Dip Manna, Koushik Mondal, and Prasanta Karmakar, Saha Institute of Nuclear Physics, 1-Af Bidhannagar, Kolkata 700064, West Bengal, India.