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+// Exa 2.8

+clc;

+clear;

+close;

+// Given data

+Nsi = 4.9*10^22;// in /cm^3

+ni= 2.5*10^12;// in /cm^3

+q=1.6*10^-19;// in C

+miu_n= 1600;// in cm^2/Vs

+miu_p= 400;// in cm^2/Vs

+N_D= Nsi/(100*10^6);

+sigma= q*ni*(miu_n+miu_p);// in (Ωcm)^-1

+rho= 1/sigma;// in Ωcm

+disp(rho,"Resistivity of silicon in Ωcm is :")

+n=N_D;// approx

+p= ni^2/n;// in /cm^3

+sigma= q*n*miu_n;// in (Ωcm)-1

+rho= 1/sigma;// in Ωcm

+disp(rho,"Resistivity of doped silicon in Ωcm is :")