Abstract

The infrared absorption and photoresponse characteristics of n-type GaAs/AlxGa1−xAs multiple quantum wells infrared photodetector structure have been studied. With the normal incidence light, a detectivity D (8.7 μm) = 1.4 × 10★cm Hz★/W via free-carrier absorption in the wells is achieved at 77 K. This shows a possible fabrication of normal incidence quantum wells infrared photodetector without a grating coupler.

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