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+clc;clear;

+//Example 18.3

+//calculation of fraction of e in CB

+

+//given values

+T=300;//temp in K

+kT=.026;//temperture equivalent at room temp in eV

+Eg1=.72;//forbidden gap of germanium in eV

+Eg2=1.1;//forbidden gap of silicon in eV

+Eg3=5.6;//forbidden gap of diamond in eV

+

+//calculation

+f1=%e^(-Eg1/(2*kT));

+disp(f1,'fraction of e in  conduction band of germanium is');

+f2=%e^(-Eg2/(2*kT));

+disp(f2,'fraction of e in  conduction band of silicon is');

+f3=%e^(-Eg3/(2*kT));

+disp(f3,'fraction of e in  conduction band of diamond  is');