Please draw unsteady state concentration profiles over a long range. You need to utilize infinite boundary conditions, therefore you are required to go points where the concentrations become almost constant with respect to distance; concentration values close to boundary conditions. Draw the profiles for 4 different durations in the same graph (like 1, 100, 1000 and 10000 seconds). You are required to show the diffusivity value you used.

Base crystal is Si. Dopant is Cu. Temperature (Celsius) is 1200. C1 is 10^10 and C2 is 10^20.