Photoconductive response of PbTe doping superlattices

Jantsch, W.; Lischka, K.; Eisenbeiss, A.; Pichler, P.; Clemens, H.; Bauer, G.
June 1987
Applied Physics Letters;6/8/1987, Vol. 50 Issue 23, p1654
Academic Journal
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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