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Semiconductor Electronics question

2012 · Q150
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Semiconductor Electronics question

2012 · Q150

NEETPhysicsSemiconductor ElectronicsMCQ+4 / −1
C and Si both have same lattice structure; having 4 bonding electrons in each. However, C is insulator where as Si is intrinsic semiconductor. This is because
  1. A
    In case of C the valence band is not completely filled at absolute zero temperature.
  2. B
    In case of C the conduction band is partly filled even at absolute zero temperature.
  3. C
    The four bonding electrons in the case of C lie in the second orbit, whereas in the case of Si they lie in the third.
  4. D
    The four bonding electrons in the case of C lie in the third orbit , whereas for Si they lie in the fourth orbit.
View written solutionFree

Correct answer: C

Electronic configuration of 6C

6C = 1s2, 2s2 2p2

The electronic configuration of 14Si

14Si = 1s2, 2s2 2p6, 3s2 3p2

As they are away from Nucleus, so effect of nucleus is low for Si even for Sn and Pb are almost mettalic.

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