Abstract
Doping superlattices made of PbTe exhibit excellent photoconductive response with a peak detectivity D*≥8×1010 cm Hz1/2 W−1, which is close to the theoretical limit at 6 μm wavelength. Lifetime and far-infrared magneto-optical investigations show that photogenerated electron-hole pairs are separated in the periodic electrostatic potential, leading to a lifetime enhancement by nearly two orders of magnitude as compared to homogeneous bulk crystals.
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