Q1. The semiconductor germanium (Ge) adopts the diamond lattice and has a lattice constant of 5.658 A. It has its valence band maximum at k=0 and its conduction band minimum at the . (20 points) a. Draw the fcc unit cell and label the [111] direction. (2 points) b. Calculate the density of Ge atoms per cm3. (2 points) c. Answer is Ge a direct or indirect bandgap semiconductor? (2 points)