High-Performance Memristors Based on Ultrathin 2D Copper Chalcogenides

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Copper chalcogenides offer earth abundance and high conductivity for green electronics.
• The 2D structures and electronic properties of copper chalcogenides remain underexplored.
• Developing novel 2D materials is crucial for advancing next-generation electronic devices.

Purpose of the Study:

• To synthesize ultrathin 2D copper chalcogenide nanosheets.
• To investigate the memristive behavior of these novel 2D materials.
• To explore their potential applications in harsh electronic environments.

Main Methods:

• Synthesis of ultrathin nanosheets (down to two unit cells) using van der Waals epitaxy.
• Fabrication of memristors utilizing Cu2Te, CuSe, and Cu9S5 nanosheets.
• Characterization of memristive performance, including switching voltage, speed, uniformity, temperature range, retention, and endurance.

Main Results:

• Successful synthesis of layered (Cu2Te) and nonlayered (CuSe, Cu9S5) ultrathin nanosheets.
• Demonstration of nonvolatile memristive behavior in 2D copper chalcogenides for the first time.
• Achieved low switching voltage (≈0.4 V), fast switching, high uniformity, wide operating temperature range (80–420 K), stable retention, and good endurance.

Conclusions:

• Ultrathin 2D copper chalcogenide crystals are promising for memristive devices.
• The unique properties enable applications in low-power, cryogenic, and high-temperature electronics.
• This work opens new avenues for utilizing earth-abundant materials in advanced electronics.