An infrared detector based on the excitation of carriers out of a modulation-doped quantum well is theoretically investigated. The efficiency of the detector is increased by using a grating to enhance the fields in the well. Scattering effects are taken into account by designing the quantum well so that upon excitation carriers will escape in a short time compared to the time it takes to scatter back into the well. Despite this constraint, a quantum efficiency of 90% is shown to be possible for a GaAs-AlGaAs quantum well with a carrier density of 1012 cm-2.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)