Schottky-barrier photodiodes were prepared by depositing either lead or indium onto p-type PbSxSe1−x epitaxial films. These photodiodes had 77 °K zero-bias resistance-area products of 26–21 000 Ω cm2 as x varied from 0 to 1, respectively. The peak detectivities were close to the background limit and could be composition tuned between 3.7 and 6.9 μm at 77 °K. Narrowband detectors were prepared by using one film as a short-wavelength cutoff filter and a second film, of slightly different composition, as the detector. These devices exhibit high quantum efficiencies, low half-bandwidths, and insensitivity to variations in incident angle.

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