Photovoltaic sensors for the far infrared - The present situation and prospects for the 8-14 micron band

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Far Infrared Radiation, Infrared Detectors, Photovoltaic Cells, Remote Sensors, Tellurides, Atmospheric Windows, Cadmium Tellurides, Infrared Imagery, Laser Applications, Lead Tellurides, Mercury Tellurides, Semiconductor Devices, Tin Tellurides

Scientific paper

The use of mercury-cadmium-telluride (MCT) and lead-tin-telluride (LTT) photovoltaic devices for sensing systems operating in the 8-14 micron wavelength band is discussed. Manufacturing techniques, as well as low- and high-frequency performance characteristics of the semiconductors, are analyzed. Devices exhibiting performance characteristics very near the thermal limit at 77 K are described. For applications requiring a high response rate, MCT systems may be preferable, though for cases requiring uniformity of response and compatibility with mass production processes the LTT option may be favored.

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