Chalcogenide glass bolometers.
The chalcogenide glass Tl(2)SeAs(2) Te(3) has been evaluated as a thermistor bolometer material for room temperature operation. Thin film bolometers were fabricated on mica, glass, and sapphire substrates by both hot-pressing and rf sputtering techniques. Best results were achieved with 10-micro thick Tl(2)SeAs(2) Te(3) elements on thin mica substrates. Using a 500 K blackbody at a 10-Hz chopping frequency, a 2.5 x10(_3)cm(2) device yielded an NEP of 2.3 x 10(_9) W Hz(_4) cm(-2) device achieved an NEP of 7.7 x 10(-10) W Hz(-1/2) The ac performance of these devices is limited by their inherently long response times (tau congruent with 1 sec).
Bishop
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Moore
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