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//Chapter 12 : Semiconductor Physics
clear;
//Variable declaration
Eg=0.8 //Energy gap width
T=300
m=9.1*10**-31 //mass of electron
k=1.38*10**-23
h=6.63*10**-34
//Calculations
ni=2*((2*22*m*k*T)/(7*h**2))**(3/2)*exp((-Eg*1.6*10**-19)/(2*k*T))/10**18
//Result
mprintf("Concentration of intrinsic charge= %.2f*10**18 /m**3",ni)
//The answer provided in the textbook is wrong
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