Probing charge traps at the 2D semiconductor/dielectric interface

Area of Science:

• Materials Science
• Condensed Matter Physics
• Electrical Engineering

Background:

• 2D semiconductors offer unique electronic properties but face integration challenges.
• Charge traps at the 2D semiconductor/dielectric interface hinder industrial application.
• Existing methods for quantifying interface trap density (D_it) yield inconsistent results.

Purpose of the Study:

• To review and analyze characterization techniques for 2D semiconductor/dielectric interfaces.
• To address the challenge of accurately quantifying interface trap density (D_it).
• To provide guidance on selecting appropriate methods for trap analysis in 2D materials.

Main Methods:

• Discussion of small-signal AC measurements.
• Analysis of subthreshold slope measurements.
• Examination of low-frequency noise measurements.

Main Results:

• Conventional methods require re-evaluation for 2D semiconductor devices.
• Discrepancies in D_it estimations highlight the need for improved techniques.
• Efficacy and accuracy of methods in differentiating trap states are assessed.

Conclusions:

• Accurate quantification of D_it is essential for advancing 2D semiconductor technology.
• Careful re-evaluation of established characterization techniques is necessary.
• Guidance is provided for selecting reliable methods for interface trap analysis.