In a p-n junction, the depletion region is 400nm wide and and electric field of `5xx10^5Vm_(-1)`exists in it (a)Find the height of the potential barrier, (b)What should be the minimum kinetic energy of a conduction electron which can diffuse from the n-side to the p-side?

Explanation

The p.d across the junction V = Ed
But change in K.E. = work done
`therefore ` the K.E required to conduct electron from n side top side = V electron volts
` = 5 xx 10^5 xx 400 xx 10^(-9) = 0.2 eV `