Enhanced Photodetection Capabilities of Smaller Size 2D Au/PtSi/P-Si Nanohole Array-Based MIR Schottky Detector

In this study, we reported a surface plasmon-enhanced uncooled Schottky mid-infrared (MIR) detector using 2D Au/PtSi/p-Si nanohole arrays. These periodic nanohole arrays increase the detector’s absorption coefficient via surface plasmon resonance principle. We reduced the device’s active area from 9.0 mm
²
to 0.25 mm
²
to enhance carrier collection efficiency by shortening the carrier path to the electrodes before recombination. To minimize low-frequency noise, we employed high-frequency light chopping and detected the response signal using trans-impedance and lock-in amplifiers. These optimizations resulted in a 10-fold improvement in responsivity and enhanced stability. Additionally, we successfully demonstrated the practical applicability of the new device.