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+// Example no.5.1

+// To calculate (a) the photon incidence rate, (b) the photon absorption rate, and, (c) the quantum efficiency.

+// Page no.196

+

+clc;

+clear all;

+// Given data

+lambda=550*10^(-9);                         // The wavelength of electromagnetic wave in m

+c=3*10^8;                                   // Speed of ligth in air

+h=6.626*10^(-34);                           // Planck's constant

+alpha=10^4;                                 // absorption coefficient

+W=3*10^-4;                                  // width of the active region

+Pi=1*10^-9;                                 // optical power

+eta=0.9;                                    // the fraction of photocarriers that contribute to the photocurrent

+Rp=0;                                       // the power transmission coefficient at the air–semiconductor interface

+

+// (a) the photon incidence rate

+Eph=(h*c)/lambda;                          // The energy of a photon

+Rincident=Pi/Eph;                          // The photon incidence rate

+

+// Display result on command window

+printf('\n The photon incidence rate = %0.2f X 10^9 photon/s',Rincident*10^-9);

+

+// (b) the photon absorption rate

+Rabs=(Rincident*(1-exp(-alpha*W)));        // The photon absorption rate

+

+// Display result on command window

+printf('\n The photon absorption rate = %0.2f X 10^9 photon/s',Rabs*10^-9)

+

+//c) the quantum efficiency

+neta=(1-Rp)*eta*(1-exp(-alpha*W));          // The quantum efficiency

+

+// Display result on command window

+printf('\n The quantum efficiency = %0.3f',neta)