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```				   In semicondutors   the usually doped impurities are penta&trivalent by this conductivity increases,,,,,,so my question is what happens if we add six valent  or two valent then what happens to conductivity of the semiconductor????????????pls explain
```

6 years ago

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```										dear aditya kulkarni,
The ease with which electrons in a semiconductor can be excited from the valence band to the conduction band depends on the band gap between the bands. The size of this energy bandgap serves as an arbitrary dividing line (roughly 4 eV) between semiconductors .
and this enrgy is not provided in case if we add six valent  or two valent.
```
5 years ago

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