Infrared Detection With Spontaneous Pulsing in Multi Quantum Well Structures

A. G. U. Perera, S. G. Matsik and M. H. Francombe
Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303

ABSTRACT
A new method of infrared detection without any preamplifiers is presented. The method is based on well studied multiquantum well (MQW) structures and the injection mode integrate-and-fire infrared detectors using p⁺-n-n⁺ diodes) is given. A model based on device phusics to describe spontaneous pulsing in GaAs/AlGaAs quantum well structures is presented. The model includes space charge generation/recombination mechanisms such as tunneling and impact of injected hot electrons with cold well electrons, with current voltage relations leading to spontaneous pulsing in MQW structures. It is shown with the correct parameters, spontaneous pulsing could be observed in MQW structures at 300K. The IR photoionization contribution to space charge generation is added to the model to obtain the infrared response. This response can take the form of a change in the pulse rate or pulses being generated for a subthreshold bias conditions. This gives rise to novel IR detectors operating above 77 K up to near room temperature. © 1996 by the Society of Photo-Optical Instrumentation Engineers

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