5. Intrinsic and Extrinsic Semiconductor a. Ge Using the values of the density of states effective masses mc and mh in the table, calculate the intrinsic concentration in Ge. What is ni if you use Nc and Nv from the table? Calculate the intrinsic resistivity of Ge at 300K. b. Fermi level in intrinsic semiconductors Using the values of the density of states effective masses mc and mh in the table, find the position of the Fermi energy in intrinsic Si, Ge, and GaAs with respect to the middle of the bandgap (Eg/2). c. An extrinsic Si crystal has been doped with P. The donor concentration is 1015cm3. Find the conductivity and resistivity of the crystal. Table 2. Selected typical properties of Ge, Si, InP, and GaAs at 300K