%Vbi Computation (p+/n and n+/p junctions)



%Constants

EG=1.12;

kT=0.0259;

ni=1.0e10;



%Computation

ND=logspace(14,17);

Vbi=EG/2+kT.*log(ND./ni);



%Plotting

close

semilogx(ND,Vbi);  grid

axis([1.0e14 1.0e17 0.75 1])

xlabel('NA or ND (cm-3)');  ylabel('Vbi (volts)')

text(1e16,0.8,'Si, 300K')

text(1e16,0.78,'p+/n and n+/p diodes')