Draw energy band diagram for a MOS structure in thermal equilibrium with 

(a).  P-type semiconductor. Use4 , 3.5 , 1.0m sc Gq eV q eV E eV = = = and calculate VFB. Estimate the required applied voltage to achieve

(b) accumulation, 

(c) depletion and

 (d) inversion.

 Draw the energy band diagrams for (b), (c) and (d). 

Explain and on the energy band diagram bulk and surface potentials.