Answer :

Width of depletion region, d= 400 nm= 4×10-7 m

Electric Field, E= 5×105 Vm-1


(a) Let the height of potential barrier be V Volts.


We know that,


E=V/d


V=Ed


V=5×105×4×10-7


V=0.2 Volts


(b) The minimum kinetic energy required for diffusion of an electron from n-side to p-side


K.Emin= Potential barrier × Charge on an electron


= 0.2 V × 1.6 × 10-19 C


= 0.2 eV


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