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http struct Homework 8 x maxwell equation YouTube Home Chegg.com c 3. Development of Plane Coue ME328HW8.pdf A 2/2 Problem 2 The fabrication of semiconductor is performed through the doping of silicon with of a small percentage of aluminum. The doping is performed by putting a layer of aluminum in contact with silicon block as shown in figure 2 Alluminum Silicon Figure 2 (z,t) The equation of diffusion of aluminum is defined as ot a where x (z, t) is the percentage of aluminum in at each layer erials Assume that: The layer of aluminum remain pure during the whole process, At t 0, both material were pure The aluminum cannot reach the a length Linside the silicon Minimize File Preview O M a Q 8:37 PM 5/4/2016

Solution

As at initial stage material in consideration that are aluminium and silicon are considered to be substantially pure , We can safely assume that aluminium will dope to silicon with percentage of ionic character in it.

Also, As it is given that the aluminum cannt reach the length L inside the silicon , The resultant dope will be called silicon doped with al not Aluminium doped with Si.