Breaking Taps @breakingtaps.com · Dec 24 Today in neat electro-optical detectors: hybrid photodiodes! Photocathode on one end, photodiode on the other, electrodes in between, pump to high vacuum. Photocathode emits electrons, which are accelerated and slam into the photodiode generating a "photocurrent".
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As the energetic electron travels through the Si it generates hole/electron pairs just like a photon, so the device "sees" a photocurrent. It provides moderate amplification because a high velocity electron will usually generate multiple hole/e- pairs