Question

the forbidden energy gap for silicon is 1.1eV and for gzrmanium is 0.7eV which will have more conductivity

Answer 1

germanium has more conductivity at normal temperature due Free electrons than silicon
silicon can be used in higher temperature

Answer 2

Both silicon and germanium have energy band gaps because they are semiconductors. Silicon's band gap is larger than that of germanium. The bandgap of any material is never negative.

The energy difference between the valence and conduction bands is defined as the band gap.

Semiconductors have an energy band gap that lies somewhere between that of insulators and that of conductors. Semiconductors can act as conductors when exposed to external electric fields. If the applied external electric field is greater than the band gap of the material, conduction will occur. At room temperature, it is also possible to conclude that silicon will generate more electron hole pairs than germanium.

At room temperature, silicon has a larger energy band gap than Germanium, resulting in Germanium having higher conductivity than silicon.

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