Space charge spectroscopy of integrated quantum well infrared photodetector-light emitting diode

We present the results of the space charge spectroscopy of integrated quant um well infrared photodetector - light emitting diode (QWIP-LED). Quasistat ic capacitance-voltage (C-V) characteristics under reverse bias display a s teplike behavior due to a step-wise extension of the space charge region wi th bias. The parameters of the steps, and the frequency dispersion of the c apacitance are used to determine the QW period thickness. QW doping level, and the number of QW periods. Measurement of the QWIP-LED admittance at var ious temperatures is used to obtain the QW activation energy and the conduc tion band offset. (C) 2001 Elsevier Science B.V. All rights reserved.