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Second-harmonic generation divergence-a method for domain size evaluation of 2D materials.

Jingwen Deng, Zihan Xu, Zhihao Yu

    Optics Letters
    |December 28, 2020
    PubMed
    Summary

    Characterizing single-crystalline domain sizes in single-atomic-layered transition metal dichalcogenide (TMD) films is crucial for electronics. A new method uses second-harmonic generation divergence to quickly map domain sizes non-destructively.

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    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Nanotechnology

    Background:

    • Single-atomic-layered materials are vital for next-generation electronics and optoelectronics.
    • Two-dimensional (2D) transition metal dichalcogenide (TMD) films often consist of randomly oriented single-crystalline domains.
    • The size distribution of these domains significantly impacts film performance but is challenging to characterize.

    Purpose of the Study:

    • To develop a method for evaluating single-crystalline domain sizes in large-area 2D TMD films.
    • To enable efficient and non-destructive characterization of domain size distribution.
    • To facilitate the application of single-atomic-layered materials in advanced electronic devices.

    Main Methods:

    • Utilizing second-harmonic generation (SHG) divergence measurements.
    • Correlating SHG divergence with domain orientation and size.
    • Applying the technique for large-area domain size mapping.

    Main Results:

    • Demonstrated an approach to evaluate single-crystalline domain sizes by measuring SHG divergence.
    • Achieved domain size mapping over an 8x8 mm^2 region of a continuous MoS2 film.
    • Validated the method's effectiveness for large-area characterization.

    Conclusions:

    • The SHG divergence method offers a fast, efficient, non-destructive, and transfer-free way to characterize domain sizes in single-atomic-layered TMD films.
    • Accurate domain size characterization is essential for optimizing the performance of 2D materials in optoelectronic applications.
    • This technique facilitates the development and application of large-area 2D materials for future electronics.