Consider silicon at T 300 K with donor concentrations of Nd 1014, 1015, 1016, and 1017, cm3. Assume Na 0. (a) Calculate the position of the Fermi energy level with respect to the conduction band for these donor concentrations. (b) Determine the position of the Fermi energy level with respect to the intrinsic Fermi energy level for the donor concentrations given in part (a).

In a unit cell of fcc structure, indicate the position of one of the tetrahedral interstitial sites by plotting the corresponding tetrahedron. do the same for one of the octahedral interstitial sites (in a separate fcc unit cell). mark the positions of all the tetrahedral and octahedral interstitial sites in the unit cells. how many equivalent tetrahedral sites and how many equivalent octahedral sites are contained in a fcc unit cell, respectively. what is the coordination number for a tetrahedral site and what is the coordination number for an octahedral site?