Silicon doped with Galium forms___of semi conductor due to presence of an ____ bond.(Fill the blanks.)
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Silicon doped with Galium forms p-type of semi conductor due to presence of a free bond.
p - type semiconductors :
These type of semiconductors are produced when a trivalent impurity is doped into a silicon or germanium crystal.
The major trivalent impurities used to make this type of semiconductors are the members of the Group 13 of Periodic Table.
- Boron
- Gallium
- Aluminium
Silicon can form a maximum of 4 bonds. So , if a trivalent impurity is doped , three bonds are formed with silicon and one extra bond remains free due to deficiency of electrons.
Due absence of a particular bond in a specific place in the lattice of the crystal , holes are produced which act as charge carriers.
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