1) Consider the energy band diagrams of a metal and a semiconductor shown in figure. The semiconductor has a relative dielectric constant of 12, an electron affinity x = 3.25 eV, Ps= 3.5 eV, and a bandgap Eg = 1.0 eV. The metal has a workfunction = 4.0 eV. Answer the following questions. EFM PM Metal Eo Eo ? ?? a) What is the value of the (1) Schottky barrier height? (2)What is the built-in voltage V? (sign also)? (3) What is the depletion width W in equilibrium? (3) What is the peak electric field (sign also) Emax in the semiconductor under equilibrium conditions? b) Draw the energy band diagram of this metal-semiconductor junction in equilibrium. Label key parameters on the diagram when MS junction is made. Replace metal contact so that MS junction becomes ohmic. What are the possible work function this new metal for ohmic contact, plot now energy band diagram for ohmic junction. Semiconductor EFS

1) Consider the energy band diagrams of a metal and a semiconductor shown in figure. The semiconductor has a relative dielectric constant of 12, an electron EPS affinity x = 3.25 ev, @s = 3.5 ev, and a bandgap EM Eg = 1.0 eV. The metal has a workfunction ON = 4.0 eV. Answer the following questions. a) What is the value of the (1) Schottky barrier Metal Semiconductor height? (2)What is the built-in voltage Vo (sign also)? (3) What is the depletion width W in equilibrium? (3) What is the peak electric field (sign also) Emax in the semiconductor under equilibrium conditions? b) Draw the energy band diagram of this metal-semiconductor junction in equilibrium. Label key parameters on the diagram when MS junction is made. Replace metal contact so that MS junction becomes ohmic. What are the possible work function this new metal for ohmic contact, plot now energy band diagram for ohmic junction