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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
44-1
44.1 Introduction
Photojunction sensors (photodiodes and phototransistors) are semiconductor devices that convert the
el
ectrons
ge
nerated
by th
e
ph
otoelectric
e
ect
in
to
a de
tectable
el
ectronic
sig
nal
. e ph
otoelectric eect
is a ph
enomenon
in wh
ich
ph
otons
lo
se
en
ergy
to el
ectrons
in a ma
terial
. In th
e
ca
se
of a se
miconductor,
wh
en
th
e
en
ergy
of an in
teracting
ph
oton
(hv) ex
ceeds
th
e
en
ergy
of th
e
se
miconductor
ba
ndgap
(E
g
),
th
e
en
ergy
ab
sorbed
ca
n
pr
omote
an el
ectron
fr
om
th
e
va
lence
ba
nd
to th
e
co
nduction
ba
nd
of th
e
ma
te-
rial
. i
s
ca
uses
th
e
fo
rmation
of an el
ectron–hole
pa
ir
. In th
e
pr
esence
of an el
ectric
e
ld,
th
ese
ch
arges
dr
i
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Publisher Resources

ISBN: 9781439848913