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+// Find conductivity of intrinsic germanium

+// Basic Electronics

+// By Debashis De

+// First Edition, 2010

+// Dorling Kindersley Pvt. Ltd. India

+// Example 1-29 in page 53

+

+clear; clc; close;

+

+// Data given

+ni=2.5*10^13; // Intrinsic concentration /cm^3

+e=1.6*10^-19; // Charge on an electron in C

+mu_n=3800; // Mobility of electrons in cm^2/Vs

+mu_p=1800; // Mobility of holes in cm^2/Vs

+N_D=4.41*10^15; // Concentration of donor atoms in Ge /cm^3

+

+// Calculation

+sigma=(ni*e)*(mu_n+mu_p);

+printf("(a)Intrinsic conductivity=%0.4f s/cm\n",sigma);

+p_0=(ni^2)/N_D;

+printf("p_0=%0.2e /cm^3\n",p_0);

+sigma1=N_D*e*mu_n;

+printf("(b)Since n_0>p_0, Conductivity=%0.2f s/cm\n",sigma1);

+n_0=(ni^2)/N_D;

+printf("With given acceptor impurity,\nn_0=%0.2e /cm^3\n",n_0);

+sigma2=N_D*e*mu_p;

+printf("(c)Since p_0>n_0, Conductivity=%0.2f s/cm",sigma2);

+

+// Result

+// (a) Conductivity in first case is 0.0224 s/cm

+// (b) Conductivity in second case is 2.68 s/cm

+// (c) Conductivity in third case is 1.27 s/cm
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+ (a)Intrinsic conductivity=0.0224 s/cm

+p_0=1.42e+011 /cm^3

+(b)Since n_0>p_0, Conductivity=2.68 s/cm

+With given acceptor impurity, 

+n_0=1.42e+011 /cm^3

+(c)Since p_0>n_0, Conductivity=1.27 s/cm 
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