Interface roughness transport in terahertz quantum cascade detectors

Lhuillier, Emmanuel; Ribet-Mohamed, Isabelle; Rosencher, Emmanuel; Patriarche, Gilles; Buffaz, Amandine; Berger, Vincent; Carras, Mathieu
February 2010
Applied Physics Letters;2/8/2010, Vol. 96 Issue 6, p061111
Academic Journal
Infrared detectors based on a quantum cascade have been proposed to suppress the dark current which is a limiting factor in quantum well infrared photodetectors. Those detectors have been mainly designed for the midinfrared wavelength. Operating in the terahertz range involves a complete change of regime of transport since the photon energy is lower than the optical phonon energy. Thanks to a two dimensional model of transport, we have identified interface roughness as the key interaction in such a structure. Interface parameters, evaluated by scanning transmission electron microscopy, are used to study their influence on the resistance of the device.


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