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Full set of Notes with Fill-Ins - San Jose State University

Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 5 Page 113 <strong>of</strong> 316Photodiode:++++---Steps in Photoconduction:1.2.3.Photon absorbed by Si, promotes e- intoconcution band.This leaves a mobile hole and electron.Hole and electron are swept apart by theapplied field and:hν currenttransductionProperties <strong>of</strong> the photodiode:1. Gain:= φ ≤ 1 but φ is <strong>of</strong>ten near unity2. Dynamic Range:3. Ease <strong>of</strong> fabrication:Page 113 <strong>of</strong> 316Largest measureable signal >>smallest Excellent!Can be made very small.Can be made into 1D and 2D arrays

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