Please answer the problems and provide all steps to the answer

Answer:-
Now given that
So
Now we know that
Now we Know that relative permittivity of silicon is and permittivity of free space is
So
So
Now
=0.09um
xd=p+ layer thickness+ n-type epitaxial thickness=0.09um
n-type epitaxial thickness =0.09-0.07=0.02um
Answer:-
We know that the depletion width falls primarily on lightly doped side.
We know that Boltzmann approximation equation is
Now we know that...