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+// Chapter 3_The Semiconductor in Equilibrium
+//Caption_Extrinsic Semiconductor
+//Ex_5//page 101
+T=300    //temperature in kelvin
+Nc=2.8*(10^19);
+Nv=1.04*(10^19);    //
+Fe=0.25    //Fermi energy is FeeV below the conduction band
+Eg=1.12    // Bandgap energy of silicon is Eg in eV
+no=Nc*exp(-Fe/0.0259);
+po=Nv*exp(-(Eg-Fe)/0.0259);
+printf('Thermal equilibrium concentration of electrons is %1.2fd cm ^-3 and of holes is %1.2fd cm^-3 ',no,po)
+\ No newline at end of file