Ncert Exercises & Solutions

Consider the following statements about semiconductors.

I.	Silicon doped with electron-rich impurity is a p-type semiconductor.
II.	Silicon doped with an electron-rich impurity is an n-type semiconductor.
III.	Delocalised electrons increase the conductivity of doped silicon.
IV.	An electron vacancy increases the conductivity of n-type semiconductor.

The correct statements about semiconductors are:

1. I and II

2. II and III

3. III and IV

4. I and IV

HINT: n-Type semiconductors contains mobile electrons as charge carriers.

Explanation:

Silicon doped with an electron-rich impurity is an n-type semiconductor. The conductivity of n-type semiconductors is due to the presence of delocalized electrons.

Silicon doped with electron - rich impurity forms .

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