We report on a type-II InAs or GaSb strained layer superlattice
(SLS) photodetector (λ
~4.3 µm at 77 K) with nBn design grown on a GaAs
substrate using interfacial misfit dislocation arrays to minimize threading
dislocations in the active region. At 77 K and 0.1 V of the applied bias, the
dark current density was equal to 6 × 10−4 A cm−2 and the
maximum specific detectivity D* was estimated to
1.2 × 1011 Jones (at 0 V). At 293 K, the zero-bias D* was
found to be ~109 Jones which is comparable to the nBn InAs/GaSb SLS
detector grown on the GaSb substrate.
Source:IOPscience
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