When a semiconducting meterial is doped with an impurity,new acceptor levels are created .In a particular thermal collision,a valence electrons recives an energy equal to 2kT and just reaches one of the acceptor levels. Assuming that the energy of the electron was at the top edge of hte valence band and that the temperature T is equal to 300K, find the energy of the acceptor levels above the valence band.

Explanation

`2KT = Energy gap between acceptor band and valency band`
`rArr 2xx1.38xx10^(-23)xx300 = E`
`rArr E = (2xx1.38xx3)xx10^(-21)J`
` = ((6xx1.38)/(1.6))xx10^(-21)/10^(-19) eV`
`5.175xx10^(-2)eV`
`51.75meV`
`50meV`