Why in extrinsic semiconductor effective current is taken as hole current?

[libralram]

why in extrinsic semiconductor (say diode) effective current is taken as hole current why not electronic current also we cosider direction of current from p to n not from n to p plz someone give me effective answer

 

[A.Anand Srinivasan]

Re: direction

well, holes are taken to be positively charged and travel from p to n layer so that is the direction of conventional current(direction of flow of proton) and hence it is taken as the direction of current...

 

[safwatonline]

direction

holes are actually electrons , when electron move from a place to another in the valence band it is considered as if we have a positive charge "note CONSIDERED" moving "naturally" in the opposite direction "electron moving from x to y forms current from y to x while hole "+ve charge" moving from y to x forms current from y to x".
about why we consider only hole current cause in some cases "P-type " they are very much larger "in #" than electrons this doesnt mean that eletrons doesnt exist but they are "minority carriers" note this is also valid for electrons in N-type.
regards