Question

C,si,ge have same lattice structure why ic c insulator while si and ge intrinsic semiconductors

Answer 1

Explanation:

The energy required to take out an electron from these atoms (i.e, ionisation energy E. for C. ... of free electrons for conduction will be significant in Ge and Si, but will be negligibly small for C. That is why C is an insulator while Si and Ge are intrinsic semiconductors.

Answer 2

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• The 4 bonding electrons 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 will be least for Ge, followed by Si and highest fir C.
• Hence, number of free electrons conduction in Ge and Si are significant but negligibly small for C.