Integrated setup for time and spatially resolved micro-photoluminescence.

Area of Science:

• Materials Science
• Spectroscopy
• Condensed Matter Physics

Background:

• Photoluminescence (PL) spectroscopy is crucial for characterizing semiconductor materials.
• Existing methods may have limitations in resolution or sensitivity for certain sample types.

Purpose of the Study:

• To present a novel setup for comprehensive photoluminescence (PL) spectroscopy.
• To enable time-resolved, steady-state, and spatially resolved PL measurements with high resolution.

Main Methods:

• Utilized time-correlated single photon counting (TCSPC) for time-domain information (≈50 ps resolution).
• Employed a common-path birefringence interferometer for spectral information (≈1-4 eV NIR-UV range) via Fourier transform.
• Implemented a micro-PL approach for analyzing micron-sized samples, including 2D semiconductors.

Main Results:

• Successfully resolved weak PL signals from indirect-bandgap semiconductors due to high signal collection efficiency.
• Demonstrated the apparatus's capability by measuring time-, frequency-, and spatially resolved PL on WSe2, MoS2, and WS2 flakes.
• Achieved high spectral and temporal resolution for detailed material analysis.

Conclusions:

• The developed PL spectroscopy setup offers versatile and high-performance characterization capabilities.
• The apparatus is suitable for analyzing a wide range of materials, including challenging samples like 2D semiconductors and indirect-bandgap materials.
• This new tool advances the study of photoluminescence phenomena in materials science.