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clear
//
//
//
//Variable declaration
me=9.1*10^-31; //mass of electron(kg)
kb=1.38*10^-23; //boltzmann constant
T=300; //temperature(K)
h=6.62*10^-34; //planck's constant
Eg=0.7; //band gap(eV)
e=1.6*10^-19; //charge(c)
//Calculation
x=2*%pi*me*kb*T/(h^2);
n=2*(x^(3/2))*exp(-Eg*e/(2*kb*T)); //density of holes and electrons(per m^3)
//Result
printf("\n density of holes and electrons is %0.3f *10^19 per m^3",n/10^19)
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