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+//Exa2.15.3
+clc;
+clear;
+close;
+// Given data
+T1 = 300;// in K
+T2 = 400;// in K
+del_E = 0.27;// Fermi level in eV
+KT = (0.0259) * (T2/T1);// in eV
+N_v = 1.04 * 10^19;// in cm^-3
+N_v = N_v * (T2/T1)^(3/2);// in cm^-3
+p_o = N_v * exp(-(del_E)/KT);// in per cm^3
+disp(p_o,"The thermal equilibrium hole concentration in per cm^3 is");