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C, Si and Ge have same lattice structure...

C, Si and Ge have same lattice structure. Why is C insulator while Si and Ge intrinsic semiconductors?

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Energy required to take out outer orbit electrons is less for Ge and Si but very large for C. so conduction electron is not easily available is not easily available for C and hence it is insulator .
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AAKASH INSTITUTE ENGLISH-SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS-Try yourself
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