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Laser-Synthesized 2D-MoS2 Nanostructured Photoconductors
Igor A Salimon1, Ekaterina V Zharkova1, Aleksandr V Averchenko1
1Center for Photonic Science and Engineering (CPhSE), Skolkovo Institute of Science and Technology, 3 Nobel Street, 143026 Moscow, Russia.
Micromachines
|May 27, 2023
Summary
Researchers developed a laser-based method to create nanostructured 2D transition metal dichalcogenide (2D-TMD) films. These nanostructured films show significantly improved photo-response for photoconductive detectors.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- 2D transition metal dichalcogenides (2D-TMDs) are promising materials for electronic and optoelectronic applications.
- Existing synthesis methods for nanostructured 2D-TMDs can be complex and costly.
Purpose of the Study:
- To present a direct laser synthesis method for periodically nanostructured 2D-TMD films.
- To investigate the formation of nanostructures and their impact on material properties.
- To fabricate and characterize photoconductive detectors based on these materials.
Main Methods:
- Direct laser synthesis of molybdenum disulfide (MoS2) and tungsten disulfide (WS2) films using single-source precursors.
- Localized thermal dissociation induced by continuous wave visible laser radiation.
- Observation and analysis of laser-induced periodic surface structures (LIPSS) leading to nanoribbon formation.
- Fabrication of two-terminal photoconductive detectors using both nanostructured and continuous 2D-TMD films.
Main Results:
- Successful synthesis of nanostructured MoS2 and WS2 films via laser irradiation.
- Observation of spontaneous 1D and 2D periodic modulations, forming nanoribbons (~200 nm width, several micrometers length).
- Attribution of nanostructure formation to laser-induced periodic surface structures (LIPSS).
- Nanostructured 2D-TMD films demonstrated a photocurrent yield three orders of magnitude higher than continuous films.
Conclusions:
- Direct laser synthesis offers an efficient route to periodically nanostructured 2D-TMD films.
- The nanostructuring, driven by LIPSS, significantly enhances the photo-response of 2D-TMDs.
- These findings pave the way for advanced optoelectronic devices with improved performance.
