Suppose a pure Si Crystal has 5x1028 atoms m. It is doped by 1 ppm concentration of pentavalent As. Calculate
the number of electrons and hole. (Given that n; = 1.5 x1016 m3)
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Explanation:
a)Number of electrons =5×10
22
m
3
b)Number of holes =4.5×10
9
m
3
a)Each Arsenic atom will provide one electron.
Hence,
Numberofelectrons=NumberofAsatoms
Number of electrons =
10
6
5×10
28
=5×10
22
m
3
b)We know
ni
2
=numberofelectrons×numberofholes
Number of holes =
numberofelecrons
ni
2
Number of holes =
5
1.5×10
16
×10
22
Number of holes =
5
2.25×10
32
×10
22
Number of holes =4.5×10
9
m
3
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