Fast Response Hot (111) HGCDTE MWIR Detectors

Abstract

AbstractIn this work we report simulation and experimental results for an MWIR HgCdTe photodetector designed by computer simulation and fabricated in a joint laboratory run by VIGO Sytems S.A. and Military University of Technology. The device is based on a modified N+pP+heterostructure grown on 2”., epiready, semi-insulating (100) GaAs substrates in a horizontal MOCVD AIX 200 reactor.The devices were examined by measurements of spectral and time responses as a function of a bias voltage and operating temperatures. The time response was measured with anOptical Parametric Oscillator(OPO) as the source of ~25 ps pulses of infrared radiation, tuneable in a 1.55–16 μm spectral range. Two-stage Peltier cooled devices (230 K) with a 4.1 μm cut-off wavelength were characterized by 1.6 × 1012cm Hz1/2/W peak detectivity and < 1 ns time constant forV> 500 mV.