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CuS nanosheets with controllable morphology and alignment for memristor devices
Jian Biao Chen1, Kai Zhang1, Zi Jin Jiang1
1Key Laboratory of Atomic & Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China.
Nanotechnology
|March 10, 2022
Summary
Researchers optimized resistive switching (RS) in memristors by synthesizing uniform copper sulfide (CuS) nanosheets. This resulted in low operating voltage, stable performance, and a novel negative differential resistance (NDR) behavior.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Electronics
Background:
- Resistive switching (RS) in electrochemical metallization memristors relies on conductive filament formation, which is often unpredictable.
- Optimizing ion migration is crucial for stable and controllable memristor performance.
Purpose of the Study:
- To synthesize uniform copper sulfide (CuS) nanosheets for controlled ion migration in Al/CuS/Cu memristor structures.
- To investigate the resistive switching performance and explore the coexistence of negative differential resistance (NDR).
Main Methods:
- Synthesis of CuS nanosheet films via anodization for varied durations.
- Fabrication and characterization of Al/CuS/Cu memristor devices.
- Analysis of the resistive switching and NDR mechanisms using physical models.
Main Results:
- Achieved stable RS performance with a low operating voltage (<0.3 V).
- Demonstrated reversible negative differential resistance (NDR) behavior.
- Identified space-charge limited conduction and Cu ion migration for RS, and Schottky barrier for NDR.
Conclusions:
- Uniform CuS nanosheets enable optimized ion migration, leading to enhanced memristor performance.
- The study elucidates the mechanisms behind the coexisting RS and NDR phenomena.
- This approach offers a new pathway for developing non-volatile memory with multiple attributes.
