Law of mass action
When an intrinsic semiconductor is doped with pentavalent impurity, the number of free lectrons increases. Will it result in any change in the number of holes already present?
The answer is YES.
When the semiconductor is doped with pentavalent impurity, the ne increases and will result in a decrease in nh according to the relation.
ni2 = ninh
This relationship is called the mass action law.
When the no. of free electrons increases, greater no. of holes already present get neutralised.
Categories: Electronics Tags: doping, electronics, mass action, semiconductor
Doping
Doping is the deliberate addition of desirable impurities to an intrinsic semicounductor to modify its conducting propertires.
The impurity atoms added are called dopants and the semi conductor so formed is called extrinsic semiconductor.
Depending on the type of impurities added, extrinsic semiconduictors are divided into two : n -type and p-type.
Note:
The extrememly pure form of semiconductor is called intrinsic semiconductor.
The conductivity of an intrinsic semiconductor is extremely low (but greater than insulators), and therefore as such there is no much practical use of intrinsic semiconductor. But when suitably doped to make extrinsic semiconductor, it works wonders. We get greater control over the flow of electrons.
Categories: Electronics, Plus Two Physics Tags: doping, electronics, extrinsic, intrinsic, semiconductor
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