(Solved):
Suppose that it is desired to diffuse Al into pure Si such that Al concentration at a depth of ...
Suppose that it is desired to diffuse Al into pure Si such that Al concentration at a depth of 10−3cm from the surface will be just half of the surface concentration. How long should a silicon piece would be heated in Al-vapor at 1327∘C ? Assume: 1. erf(z)≅z 2. Diffusivity of Al in Si at 1327∘C is 8×10−12cm2/s.