Charatererization of High-Performance AlGaN-Based Solar-Blind UV Photodetectors

Abstract:

This study begins with the fabrication and simulation of high-performance back-illuminated AlGaN-based solar-blind UV photodetectors.Based on the photodetectors, a low-noise, high-gain UV detection system circuit is designed and fabricated, enabling the detection, acquisition, and calibration of weak solar-blind UV signals. Experimental results demonstrate that under zero bias conditions, with a UV light power density of 3.45 μW/cm2 at 260 nm, the sample achieves a peak responsivity (R) of 0.085 A/W, an external quantum efficiency (EQE) of 40.7%, and a detectivity (D*) of 7.46?1012 cm?Hz1/2?W-1. The system exhibits a bandpass characteristic within the 240~280 nm wavelength range, coupled with a high signal-to-noise ratio of 39.74 dB.

Key words:solar-blind UV; AlGaN; UV detection system circuit; optical properties;signal-to-noise ratio