A fully quantum mechanical model for electron transport in quantum well infrared photodetectors isudpresented, based on a self-consistent solution of the coupled rate equations. The important macroscopicudparameters like current density, responsivity and capture probability can be estimated directly from thisudfirst principles calculation. The applicability of the model was tested by comparison with experimentaludmeasurements from a GaAs/AlGaAs device, and good agreement was found. The model is general and canudbe applied to any other material system or QWIP design.
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