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+//Exa 1.23.11

+clc;

+clear;

+close;

+//Given data

+T = 300;// in K

+n_o = 10^15;// in cm^-3

+n_i = 10^10;// in cm^-3

+p_o = 10^5;// in cm^-3

+del_n = 10^13;// in cm^-3

+del_p = del_n;// in cm^-3

+KT = 0.0259;// in eV

+delta_E1= KT*log(n_o/n_i);// value of E_F-E_Fi in eV

+delta_E2= KT*log((n_o+del_n)/n_i);// value of E_Fn-E_Fi in eV

+delta_E3= KT*log((p_o+del_p)/n_i);// value of E_Fi-E_Fp in eV

+disp(delta_E1,"The Fermi level for thermal equillibrium in eV is : ")

+disp(delta_E2,"The quase-Fermi level for electrons in non equillibrium in eV is : ")

+disp(delta_E3,"The quasi-Fermi level for holes in non equillibrium in eV is : ")

+disp("The quasi-Fermi level for electrons is above E_Fi ")

+disp("While the quasi-Fermi level for holes is below E_Fi")