5.1 Principle of the p-n Junction Photodiode
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Photodiode (PD) generates current from photo
has:
1. a p-n junction.
2. a reverse biased (barrier = V
bi
Vr).
3. a opening to receive photons.
4. an antireflection coating (Si3N4).
5. an electron-hole-pair generation in
depletion region.
6. electrons and holes move by build-in
electric field and are collected by
electrodes.

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