Question

Ezample 15.1 C, SI and Ge have same lattice structure. Why is
Insulator while Si and Ge intrinsic semiconductors?
int alertons of c. Si or Ge lie, respectively​

Answer 1

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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.