Near infrared metal semiconductor metal photodetector based on semi insulating G

Metal-semiconductor-metal photodetectors on semi-insulating GaAs with interdigital electrodes showed significant enhancement in the spectral response in the near-infrared region as the electrode spacing is reduced. The photocurrent for the device with 5 μm interdigital spacing is five orders of magnitude higher than the dark current, and the room temperature detectivity is on the order of 2.4 × 1012 cmHz1/2 W-1 at 5 V bias. Furthermore, the spectral response of this device possesses strong depen