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Theory of avalanche multiplication and excess noise in quantum-well infrared photodetectors

Theorie der Lawinenmultiplikation und des Überschussrauschens in Quantenfilm Infrarot-Photodetektoren
: Schneider, H.


Applied Physics Letters 82 (2003), No.24, pp.4376-4378
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()
QWIP; infrared; Infrarot; avalanche multiplication; Lawinenmultiplikation; impact ionisation; Stoßionisation; noise; Rauschen; theory; Theorie

A theoretical treatment of the noise current of quantum-well infrared photodetectors in the presence of avalanche multiplication is presented. Avalanche multiplication results in a characteristic excess noise which is expressed as a function of the avalanche multiplication factor and the capture probability. The multiplication factor can thus be determined from the photoconductive gain and the noise gain.