InterviewSolution
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InterviewSolution
| 1. |
C, Si and Ge have same lattice structure . Why is C an insulator while Si and Ge are intrinsic semiconductors ? |
| Answer» SOLUTION :The 4 bondingelectrons of C , Si or Ge lie respectively , in the second , THIRD and fourth orbit . HENCE , ENERGY required to take out an electron from these atoms (i.e., ion ionisation energy `E_(g)`) will be least for Ge , followed by Si and highest for C . Hence number of free electrons for conduction in Ge and Si are significant but negligibly SMALL for C . | |