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Updated: Oct 9, 2025

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

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Nanoscale Raman Characterization of a 2D Semiconductor Lateral Heterostructure Interface.

Sourav Garg¹, J Pierce Fix², Andrey V Krayev³

¹Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States.

|December 22, 2021

Summary

Tip-enhanced Raman scattering (TERS) reveals alloyed interfaces in 2D MoS2/WS2 heterostructures. These interfaces vary significantly in size, impacting optoelectronic functionalities and device performance.

Keywords:

2D alloys 2D lateral heterostructure Raman TERS interface

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Last Updated: Oct 9, 2025

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Published on: October 12, 2019

Area of Science:

Materials Science
Nanotechnology
Condensed Matter Physics

Background:

Lateral heterostructures of 2D semiconductors are crucial for advanced optoelectronics.
The interface's properties (composition, size, heterogeneity) dictate device functionality.
Understanding these interfaces at the nanoscale is essential for material development.

Purpose of the Study:

To characterize the interface in single-layer MoS2/WS2 lateral heterostructures using nanoscale techniques.
To determine the composition, size, and heterogeneity of the interfacial region.
To correlate interfacial properties with the functionalities of 2D systems.

Main Methods:

Tip-enhanced Raman scattering (TERS) spectroscopy with 50 nm spatial resolution.
Utilizing both resonant and nonresonant TERS modes.
Nanoscale imaging of continuous interfacial evolution.

Main Results:

The interface is alloyed, with domain sizes ranging from 50 to 600 nm within a single crystal.
TERS enabled deconvolution of defect activation, resonant enhancement, and material composition (MoS2, MoWS2, WS2).
Detailed nanoscale mapping of vibrational modes across the heterostructure.

Conclusions:

Nanoscale TERS is effective for elucidating structure-property relationships in 2D materials.
Characterization of lateral interfaces at imperative length scales is demonstrated.
The findings are vital for designing next-generation 2D optoelectronic devices.