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clc
T=300 //K
k=8.617*10^-5 //eV/K
q=1.6*10**-19 //C
NA=10^17//cm^-3
d=5*10^-7//cm
Co=6.9*10^-7
Qf=5*10^11//cm^-2
Qm=0
Qot=0
epsilonox=3.9//F/cm
epsilonx=8.854*10^-14 //F/cm
deltaVfb=(q/(epsilonox*epsilonx))*[(0.5*10^18*(2*10^-6)^2)-(0.333*5*10^23*(2*10^-6)^3)]
disp(deltaVfb,"deltaVfb in V is= ")
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