Two-Dimensional WSe₂/Organic Acceptor Hybrid Nonvolatile Memory Devices Based on Interface Charge Trapping.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials possess unique electronic properties ideal for advanced electronic devices.
• Interface charge transfer in 2D materials offers a flexible approach for electronic applications.

Purpose of the Study:

• To investigate nonvolatile memory devices utilizing charge trapping at the interface of 2D WSe₂ and organic electron acceptors.
• To correlate the electron affinity of organic acceptors with memory device performance.

Main Methods:

• Fabrication of hybrid memory devices combining 2D WSe₂ with organic electron acceptors.
• Characterization of device performance, including gate memory windows, on/off ratios, and retention time.
• Systematic analysis of the relationship between organic acceptor properties (electron affinity, redox potential) and memory characteristics.

Main Results:

• The 2D WSe₂-organic acceptor hybrid structure demonstrated high storage performance.
• Achieved large gate memory windows, high on/off ratios (>10³), and long retention times (>1000 s).
• Stronger electron affinity in organic acceptors led to enhanced electron-trapping ability and improved memory performance.

Conclusions:

• Interface charge trapping between 2D WSe₂ and organic electron acceptors is an effective strategy for nonvolatile memory devices.
• The choice of organic electron acceptor, specifically its electron affinity, is crucial for optimizing memory performance.
• This work highlights the potential of 2D material-organic hybrid systems for next-generation electronic memory applications.