4.) Compare the concentration profile of arsenic impurities in a 1.2 meter long Si ingot grown by (a.) the CZ technique and (b.) the FZ technique. Show this comparison in the form of a plot. Assume the starting concentration of the feed in both cases be 21018cm3. Also assume the zone length for the FZ growth is 6cm. (a.) Plot concentration on a log scale. Assume e=. Label your plots. 4.) Compare the concentration profile of arsenic impurities in a 1.2 meter long Si ingot grown by (a.) the CZ technique and (b.) the FZ technique. Show this comparison in the form of a plot. Assume the starting concentration of the feed in both cases be 21018cm3. Also assume the zone length for the FZ growth is 6cm. (a.) Plot concentration on a log scale. Assume e=. Label your plots