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Coexistence of memory resistance and memory capacitance in TiO2 solid-state devices
Iulia Salaoru1, Qingjiang Li2, Ali Khiat1
1Nano Research Group, School of Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, UK.
Nanoscale Research Letters
|October 10, 2014
Summary
This study shows titanium dioxide (TiO2) devices can store both resistance and capacitance information simultaneously. This dual-state memory is achieved by manipulating ionic species within the TiO2 layer using voltage pulses.
Area of Science:
- Materials Science
- Solid-State Electronics
- Nanotechnology
Background:
- Titanium dioxide (TiO2) is a versatile material with potential applications in electronic devices.
- Understanding and controlling memory effects in TiO2-based devices is crucial for next-generation electronics.
Purpose of the Study:
- To investigate the simultaneous coexistence of resistance and capacitance memory effects in TiO2-based two-terminal cells.
- To explore the mechanism behind these dual memory states.
Main Methods:
- Fabrication of Pt/TiO2/TiO x /Pt two-terminal devices.
- Characterization of current-voltage (I-V) behavior to identify hysteresis and non-zero crossing.
- Application of voltage cycling and voltage pulses to induce and control memory states.
Main Results:
- Demonstrated devices exhibiting both resistance and capacitance memory effects.
- Observed simultaneous setting of resistance and capacitance states through electrical stimuli.
- Identified bias-induced reduction of the TiO x active layer via ionic displacement as the underlying mechanism.
Conclusions:
- TiO2-based devices can effectively exhibit dual resistance and capacitance memory states.
- The observed memory effects are attributed to bias-induced ionic migration and reduction within the TiO x layer.
- This finding opens avenues for advanced memory devices with enhanced data storage capabilities.
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