Grating enhanced quantum well detector

Goossen, K. W.; Lyon, S. A.
December 1985
Applied Physics Letters;12/15/1985, Vol. 47 Issue 12, p1257
Academic Journal
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-A1GaAs quantum well with a career density of 10[sup 12] cm[sup -2].


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