How Does Conductivity Increase in N-Type Semiconductors?

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In n-type semiconductors, conductivity increases as the number of free electrons in the conduction band rises, while the product of holes and electrons remains constant. Although adding electrons increases conductivity, it simultaneously decreases the number of holes, which can also contribute to current flow. This dynamic leads to no net increase in conductivity despite the higher electron count. Holes in the valence band can create a "hole current," analogous to the movement of electrons in the conduction band, as they represent the absence of electrons that can facilitate current flow. Understanding this balance between electrons and holes is crucial for grasping semiconductor behavior.
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How conductivity increases in n type semiconductor as ni^2 (formula nh multiplied by ne=ni^2 where nh=number of holes per unit volume and ne=number of free electrons per unit volume and ni=number of intrinsic charge carrier per unit volume remain constant?What is the use of increased number of electrons in conduction band as increasing number of electrons in conduction band decreases number of holes which were also capable of producing current i.e increasing conductivity.So overall no net increase in conductivity because as we are increasing number of electrons in conduction band at the same time we are loosing number of holes.please explain this.
 
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Holes in the conduction band cannot produce a current. There is nothing that could move. Same with electrons in the valence band - they are bound and cannot move.
 
mfb said:
Holes in the conduction band cannot produce a current. There is nothing that could move. Same with electrons in the valence band - they are bound and cannot move.
so why there is a concept called ' HOLE CURRENT'?
 
gracy said:
so why there is a concept called ' HOLE CURRENT'?
The hole current is caused by holes in the valence band (this corresponds to electrons in the conduction band).
 
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