Dual-band responsivity of AlGaN/GaN MSM UV photodiode

We proposed a AlGaN/GaN Schottky MSM diode for double-window UV sensing and realized it using three metals. They showed a significantly different value of currents between 300 nm and other wavelengths in both Fowler-Nordheim and Poole-Frenkel plots at the low voltage region, which is attributed to the direct electron conduction to the anode, and/or hole conduction to the cathode from the AlGaN region. Since the ln(I/V) levels is high for the shorter wavelength and low for the longer UV, we may apply to detect the dual windows of UV.