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(Color online) Spectral response measured at of devices with -region thicknesses ranging from . (a) shows the responsivity, (b) the quantum efficiency, and (c) the specific detectivity. In all three, the absorption at is visible as well as the water vapor absorption between 5 and .
(Color online) Quantum efficiency as a function of -region thicknesses (circles) and the extrapolation (solid line). The dash line represents the maximum possible QE without antireflective coating, assuming the refractive index of InAs (see Ref. 4).
(Color online) (a) Current density vs voltage and (b) differential resistance vs voltage at of devices with -region thicknesses ranging from . All and curves exhibit typical band-to-band tunneling behavior.
(Color online) -product dependence vs band gap energy of all grown structures. The numbers beside the circle indicate device’s -region thickness. is in and is in meV. The inset shows the normalized to 50% cutoff of as a function layer thickness.
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