initial commit / add all books

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+// Exa 7.2

+format('v',6)

+clc;

+clear;

+close;

+// Given data

+N_A = 7.5*10^24;// in atoms/m^3

+N_D = 1.5*10^22;// in atoms/m^3

+D_e = 25*10^-4;// in m^2/s

+D_h = 1*10^-3;// in m^2/s

+Torque_eo = 500;// in ns

+Torque_ho = 100;// in ns

+n_i = 1.5*10^16;// in /m^3

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

+P_C = 12.5;// in mA/cm^2

+// Electron diffusion length

+L_e = sqrt(D_e*Torque_ho*10^-9);// in m

+L_e = L_e * 10^6;// in µm

+// hole diffusion length

+L_h = sqrt(D_h*Torque_ho*10^-9);// in m

+L_h = L_h * 10^6;// in µm

+// The value of J_s can be calculated as,

+J_s = e*((n_i)^2)*( (D_e/(L_e*10^-6*N_A)) + (D_h/(L_h*10^-6*N_D)) );// in A/m^2

+J_s = J_s * 10^3;// in A/cm^2

+V_T = 26;// in mV

+I_lembda = 12.5*10^-3;

+I_s = 2.4*10^-4;

+// Open circuit voltage 

+V_OC = V_T*log( 1+(I_lembda/J_s) );// in mV

+V_OC = V_OC * 10^-3;// in V

+disp(V_OC,"Open circuit voltage in V is");

+

+// Note: There is calculation error to evaluate the value of VOC since 26*10^-3*log(1+12.5*10^-3/2.4*10^-4) calculated as 0.10318 not 0.522 V