How does a photo diode work?|PHOTODIODE

PHOTODIODE

A photo-diode is a reverse-biased silicon or germanium p-n junction in which
5.2 PHOTODIODE
Reverse current
of photo-diode is directly proportional to the light falling on it, which means that

urrent. Keverse current is produced by thermally generated electron hole pairs
re removed across the junction by the electric field created by the reverse
oltage. A photo-diode differs from a
rectifier diode in
wINDOW
CATHODE
its

that
Junction is exposed to light, the
increases with the
reverse current


ANODE


Crease in light intensity.
light
ANODE
(photons) falls on the CATHODE
the photons to the atoms in the
(in
arted by
**
Pn Junction, the energy
(7)
Figure – 9
Junction, which can create more free
electrons.

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