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Q.

If a semiconductor has an intrinsic carrier concentration of 1.41 × 1016/m3. When doped with 1021/m3 phosphorous atoms, then the concentration of holes / m3 at room temperature will be.

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a

1.41 × 1016

b

2 × 1011

c

2 × 1021

d

1.41 × 1010

answer is B.

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Detailed Solution

For any extrinsic semiconductor

ni2=nenh

ni= intrinsic charge carrier concentration

ne= electron concentration

 nh= hole concentration

nh=1.41×101621021=2×1011

 

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