Ge photocapacitive MIS infrared detectors

An undoped Ge photocapacitive detector is reported which has peak normalized detectivities D*λ at wavelengh 1.4 μm and chopping frequencies 13–103 Hz of 9×1012, 1×1012, 4×109 cm Hz1/2/W, operating respectively at temperatures 77, 195, and 295 °K. The observed temperature, spectral, and frequency response of the signal and noise are explained in terms of the measured space charge and interface state properties of the device.