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Resistive switching in nanogap systems on SiO2 substrates
Jun Yao1, Lin Zhong, Zengxing Zhang
1Applied Physics Program, Rice Quantum Institute, and Department of Bioengineering, Rice University, 6100 Main St., Houston, TX 77005, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|September 30, 2009
Summary
Resistive switching in nanosystems on SiO2 substrates is primarily due to substrate breakdown, not electrode material. This phenomenon offers promising memory properties but requires careful interpretation to distinguish from intrinsic device switching.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Electronics
Background:
- Voltage-controlled resistive switching is a key phenomenon for non-volatile memory devices.
- Nanosystems on oxide substrates are being explored for advanced electronic applications.
- Understanding the origin of switching is crucial for reliable device design.
Purpose of the Study:
- To investigate the mechanism of voltage-controlled resistive switching in various nanoscale gap systems on SiO2 substrates.
- To determine if the switching behavior is dependent on the electrode materials used.
- To assess the potential of these systems for memory applications.
Main Methods:
- Fabrication of nanoscale gaps using diverse materials (metals, semiconductors, carbon nanotubes) on SiO2 substrates.
- Characterization of resistive switching behavior under voltage control.
- Analysis of the switching site and substrate for evidence of damage or material interaction.
Main Results:
- Consistent switching characteristics observed across different electrode materials, independent of their composition.
- Evidence of SiO2 substrate damage at the gap region, indicating substrate-induced switching.
- Demonstration of high ON/OFF ratio (~10^5), fast switching times (2 µs), and durable cycling.
- Observation of intermediate states suggesting filamentary switching.
Conclusions:
- The observed resistive switching is predominantly an intrinsic property of the post-breakdown SiO2 substrate, not the nanoscale electrodes.
- Caution is advised when interpreting resistive switching in nanosystems on oxide substrates due to potential extrinsic substrate breakdown effects.
- Despite the extrinsic origin, the observed characteristics show potential for resistive random-access memory (RRAM) applications.
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