THERMAL AND RADIATION STABILITY IR-DETECTORS BASED ON FILMS OF SOLID SOLUTIONS Cdx Pb1–x S

It is studied the thermal and radiation stability of the IR-detectors based on photosensitive films of solid solutions in PbS–CdS system obtained by chemical vapor deposition on a pyroceramics substrate. It is shown that the films exhibit a high stability in the composition and photoelectric properties when heated to 405–410 K at normal conditions and under the influence of irradiation -radiation 300 
min with a set of the total dose up to 107 R. At increase of the CdS content in solid solution to the 17 mol. % “red” limit of the photoanswer moves in short-wave area to 1.6 microns, and a maximum photosensitivity—from 2.5 to 1.2 microns. Frequency of change rate of resistance at a light flare depending on structure of a film is in an interval from 10–100. According to the frequency characteristics photoresistors on their basis are most effective at 298 K for frequencies of the radiation modulation of 0.25–6.0 kHz. At temperature decrease of a sensitive layer to 253 K time constant increases no more, than twice at increase in volts-watt sensitivity by 6–8 times. For a sensitive element of 0.480.48 mm2 on the basis of solid solution Cd0.062Pb0.938S the maximum value of detective ability at 300 K (
max, 1000 Hz) from a source like “A” made 2.5·1011 cm
(W·Hz1
2).