An p-type Si sample has been doped with 1016 aluminum atoms cm. The actor energy level for Al in Si is 0.057 eV above the valence band edge energy. Draw the relevant band diagrams to support your answer. (1). Estimate the temperature above which the sample behaves as if intrinsic. (ii). Estimate the lowest temperature above which most of the acceptors are ionized. [5+ 5 Marks, BL5]