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+clc;
+clear;
+del_n0=10^16 //concentration of electrons in cm^-3
+tau_n0=5 //excess carrier lifetime in micro-s
+t=1 //time in micro-s
+
+//Calculation
+del_nt=del_n0*exp(-t/tau_n0)
+
+mprintf("excess electron concentration= %.3g cm^-3",del_nt)