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Diffstat (limited to '3655/CH4/EX4.7/Ex4_7.sce')
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diff --git a/3655/CH4/EX4.7/Ex4_7.sce b/3655/CH4/EX4.7/Ex4_7.sce new file mode 100644 index 000000000..16f778a97 --- /dev/null +++ b/3655/CH4/EX4.7/Ex4_7.sce @@ -0,0 +1,48 @@ +// Example 4.7 +// Computation for Calculation for concentration of holes and electrons in a p-type germanium at 300 degreeK for case(A) and position of fermi level with respect to the edge of the conduction band for case(B)// +// Page no.101 + +clc; +clear; +close; + +//Given data ; +sigma=100;//100 ohmcm^-1 +mu_p=1800; +e=1.60*10^-19; +ni=2.5*10^13; +kT=0.0259; +NV=6.0*10^19; +EG=0.72; + + +//.................................(A)......................................// + +//Calculation for concentration of holes in a p-type germanium at 300 degreeK// +Pp=sigma/(mu_p*e); + +//Calculation for concentration of electrons in a p-type germanium at 300 degreeK// +np=ni^2/Pp; + +//.................................(B)......................................// + +//Calculation for P1// +P1=kT*log(NV/Pp);//P1=EF-EV + +//the fermi level is located at 0.133eV above the edge of the valance band// + +//Calculation for position of EF with respect to conduction band// +P2=P1-EG; + +//the fermi level is located at -0.587eV below the edge of the conduction band// + + +//Displaying the result in command window +printf('\n Concentration of holes of the given germanium = %0.2f x 10^17 cm^-3',Pp*10^-17); +printf('\n \n Concentration of electrons of the given germanium = %0.2f x 10^9 cm^-3',np*10^-9); +printf('\n \n EF-EV = %0.3f eV',P1); +printf("\n (This shows that the fermi level is located at 0.133eV above the edge of the valance band)"); +printf('\n \n Position of EF with respect to conduction band = %0.3f eV',P2); +printf("\n (This shows that the fermi level is located at -0.587eV below the edge of the conduction band)"); + +//Answers are varying due to round off error// |