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  4. A Si specimen is made into p-type semiconductor by doping on an average one indium atom per 6×107silicon atoms. If the number density of atoms in Si be 6×1028/m, the indium atoms per cm3 are

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Q. A Si specimen is made into p-type semiconductor by doping on an average one indium atom per $6\times10^7$silicon atoms. If the number density of atoms in Si be $6\times10^{28}/m$, the indium atoms per $cm^3$ are

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

The doping of one indium atom in silicon semiconductor will produce one acceptor atom in p-type semiconductor.
Now, 1 indium atom has been dopped per $6 \times 10^{7}$ silicon atoms,
So number density of acceptor atoms in silicon is
$=\frac{6 \times 10^{28}}{6 \times 10^{7}}=10^{21}$ atoms $/ m ^{3}=10^{15}$ atoms $/ cm ^{3}$