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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Tunable resonant Raman scattering with temperature in vertically aligned 2H-SnS2
Atul G Chakkar1, Deepu Kumar1, Ashok Kumar2
1School of Physical Sciences, Indian Institute of Technology Mandi, Mandi 175005, India. atulchakkar16@gmail.com.
Nanoscale
|July 14, 2025
Summary
This study explores temperature effects on vertically aligned 2H-tin disulfide (SnS₂) using Raman and photoluminescence. Findings reveal tunable resonant Raman scattering and temperature-dependent excitonic peaks, crucial for future device applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) semiconducting materials offer unique properties and physics for diverse applications.
- Vertically aligned 2D materials present distinct characteristics compared to their layered counterparts.
- Understanding temperature-dependent optical properties is crucial for device performance and stability.
Purpose of the Study:
- To investigate the temperature-dependent Raman and photoluminescence properties of vertically aligned 2H-SnS₂.
- To explore the tunability of resonant Raman scattering with temperature variations.
- To analyze the behavior of low-frequency phonon modes and excitonic peaks under different thermal and laser power conditions.
Main Methods:
- Chemical Vapor Deposition (CVD) method for growing vertically aligned 2H-SnS₂.
- Temperature-dependent Raman spectroscopy.
- Temperature-dependent and laser power-dependent photoluminescence spectroscopy.
Main Results:
- Established temperature-tunable resonant Raman scattering, including a crossover between resonance and non-resonance conditions.
- Observed temperature and laser power dependence of the interlayer shear mode (low-frequency asymmetric Raman mode).
- Demonstrated strong temperature dependence of excitonic peaks in photoluminescence, confirmed by laser power dependence.
Conclusions:
- The optical properties of vertically aligned 2H-SnS₂ are significantly tunable with temperature.
- Resonant Raman scattering exhibits temperature-dependent behavior, offering control over optical responses.
- Findings provide insights for designing and fabricating future devices utilizing vertically aligned 2H-SnS₂ and similar 2D materials.
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