MIT6_012F09_lec03_photo - 6.012 Electronic Devices and...

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6.012 Electronic Devices and Circuits Comments on Photoconductive Detectors - 9/17/09 Version Photoconductivity was first reported in 1873 by W. Smith [J. Soc. Telegraph Eng., Vol. 2 (1873) p. 31], making it one of the first properties of semiconductors to be studied and exploited. At the same time, some of the newest, fastest, most sophisticated, and most complex photodetectors are based on the phenomenon of photoconductivity. The world’s fasted electrical pulses are made using photoconductive switches fabricated in gallium arsenide with a very short minority carrier lifetime. Many night vision and thermal imaging systems use extrinsically-doped silicon photoconductor arrays to take infrared pictures, and still others use quantum well infrared photodetector (QWIP) arrays. The images in the video shown in lecture were made with a camera that can be viewed as being very similar functionally to the silicon vidicon that goes into a home video camera, the difference being that the QWIP “vidicons” are
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This note was uploaded on 11/07/2011 for the course COMPUTERSC 6.012 taught by Professor Charlesg.sodini during the Fall '09 term at MIT.

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MIT6_012F09_lec03_photo - 6.012 Electronic Devices and...

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