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Compliance-free, analog RRAM devices based on SnO_x.

Suresh Kumar Garlapati¹, Firman Mangasa Simanjuntak², Spyros Stathopoulos³

¹Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, 502285, India. gsuresh@msme.iith.ac.in.

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Summary

Tin oxide (SnOₓ) shows promise for brain-inspired resistive random-access memory (RRAM), offering compliance-free analog switching. These devices exhibit multiple stable states, ideal for advanced memory applications.

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Area of Science:

Materials Science
Electrical Engineering
Computer Engineering

Background:

Resistive random-access memory (RRAM) is a promising alternative to conventional flash memory, offering superior performance, density, and lower power consumption.
Metal oxides are widely explored as resistive switching materials for RRAM devices, yet tin oxide (SnOₓ) remains understudied despite its excellent electronic properties.

Purpose of the Study:

To investigate the resistive switching behavior of tin oxide (SnOₓ) in Ti/Pt/SnOₓ/Pt RRAM devices.
To demonstrate compliance-free analog switching with multiple stable states using SnOₓ as the active material.

Main Methods:

Fabrication of Ti/Pt/SnOₓ/Pt RRAM devices using sputtering techniques.
Modulation of SnOₓ film resistance by varying the Ar/O₂ ratio during deposition.
Characterization of device performance including current-voltage (I-V) characteristics, retention, and endurance.

Main Results:

Demonstrated compliance-free analog resistive switching with multiple stable states in Ti/Pt/SnOₓ/Pt devices.
Observed bipolar memristive switching mechanism with distinct high resistance states (HRS) and low resistance states (LRS).
Achieved eleven distinct resistance states by varying pulse amplitude and width, confirming analog switching.

Conclusions:

Tin oxide (SnOₓ) is a viable material for developing high-performance, analog RRAM devices.
The compliance-free nature and multi-state capability of SnOₓ RRAM offer significant advantages for neuromorphic computing and advanced memory systems.
The devices exhibit excellent retention and endurance, highlighting their potential for practical applications.