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Distinguish between P-type and N-type semiconductor. 
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N- type Semiconductor
P- type Semiconductor
When small amount of pentavalent impurity is added to a pure semiconductor is called N-type semiconductor
When small amount of trivalent impurity is added to a pure semiconductor is called P-type semiconductor
Impurity is used for doping is arsenic, antimony, phosphorus
Impurity is used for doping is gallium, indium, boron, aluminium
It is called donor impurity
It is called acceptor impurity 
There are excess of electrons
There are shortage of electrons
The electrons are majority carriers
The holes are majority carriers


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