n-p junction ir detectors made by proton bombardment of epitaxial PbTe

Abstract
Proton bombardment has been used to make n‐p junction ir detectors from epitaxial PbTe films on BaF2 substrates. When cooled at 77°K, these detectors are background limited at f/0.8; further reduction of the field of view gives Johnson‐noise‐limited peak detectivities of 6×1011 cm Hz1/2W−1 at f/20. The peak quantum efficiencies are 0.40–0.47.