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+//Ex 2.6.3
+clc;clear;close;
+format('v',6);
+
+//Given : 
+mu_n=1500*10^-4;//m^2/V-s
+mu_p=475*10^-4;//m^2/V-s
+ni=1.45*10^10*10^6;//per m^3
+q=1.6*10^-19;//Coulomb
+rho_p=10;//ohm-cm
+rho_p=rho_p*10^-2;//ohm-m
+rho_n=3.5;//ohm-cm
+rho_n=rho_n*10^-2;//ohm-m
+sigma_p=1/rho_p;//(ohm-m)^-1
+NA=sigma_p/q/mu_p;//m^3
+sigma_n=1/rho_n;//(ohm-m)^-1
+ND=sigma_p/q/mu_n;//m^3
+VT=26*10^-3;//V
+Vj=VT*log(NA*ND/ni^2);//V
+disp(Vj,"Height of potential barrier in V : ");
+//Anser in the book is wrong.