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+//Example 5_12

+clc;

+clear;

+close;

+format('v',6);

+//given data : 

+A=5;//mm^2

+A=A*10^-2;//cm^2

+Ln=0.01;//cm

+Lp=0.01;//cm

+sigma_p=0.01;//(ohm-cm)^-1

+sigma_n=0.01;//(ohm-cm)^-1

+mu_p=500;//cm^2/V-s//For Ge

+mu_n=1300;//cm^2/V-s//For Si

+e=1.6*10^-19;//C/electron

+VT=0.026;///eV//at T=27 degree C

+b=mu_n/mu_p;//unitless

+ni=1.5*10^10;//m^-3

+sigma_i=(mu_n+mu_p)*ni*e;//(ohm-m)^-1

+I0=A*VT*b*sigma_i^2/(1+b)^2*(1/Lp/sigma_p+1/Ln/sigma_n)*10^12;//pA

+disp(I0,"Reverse saturation current(pA)");