# Help with solid state problems

eljose79
I had to pass an exam of solid state but i had some doubts with this problems

a)let be a pure semiconductor in two dimensions then they ask you for the density of electrons...would you use the formula

n**2=Nc*Pv*Exp(-Eg/K2T) ?...

another question is to obtain the density of holes in the valence band..what is the expresion?.

b)g(e)=g(e1)*g(e2) then *= is + (summed) or X (multiplication)

c)How varies the density of states with pressure?..will the width of the g(e) increase or decrease?..

hope someone can help..