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## Holes

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**Let n electrons in a semiconductor. Under the electric field**‘E’ they are drifted with a drift vd. E Holes Electrons Drifting charge carrier in a semiconductor**Then current density**Where e is the charge of an electron. Then conductivity**The drift velocity is also given by**Where is the mobility of electrons. Substituting the above values,**In case of semiconductor, the drift current density due to**electrons is given by Then the total drift current density