A Ge specimen is doped with Al. The concentration of acceptor atom is 1020 atoms/m3. Given that the intrinsic concentration of electron hole pairs is 1017/m3, the concentration of electrons in the specimen is
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a
1017/m3
b
1014/m3
c
1010/m3
d
1016/m3
answer is B.
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Detailed Solution
For extrinsic semiconductor , ni2=nenh⇒10172=ne1020⇒ne = 1014 /m3