An enhancement of the infrared detection efficiency of Si photon-counting detectors by inclusion of SiGe absorbing layers has been demonstrated for what is believed to be the first time. An improvement of 30 times in detection efficiency at a wavelength of 1210 nm compared with that of an all-Si structure operated under identical conditions has been measured. The Si/Si0.7Ge0.3 device is capable of room-temperature operation and has a response time of less than 300 ps. © 2002 Optical Society of America.
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|Published - 15 Feb 2002