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Q.

To get n-type doped semiconductor, impurity to be added to silicon should have the following number of valence electrons :

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a

2

b

5

c

3

d

1

answer is B.

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Detailed Solution

Doping of group 14 elements (such as SiGe, etc.) with elements of group 15 (such as As) produces an excess of electrons in the crystals, thus, giving n-types semiconductors.

So, to get n-type doped semiconductor, impurity to be added to silicon should have 5 valence electrons.

Hence the correct answer is (B) 5

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