Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 14

14. C and Si both have same lattice structure, having 4 bonding electrons in each. However, C is insulator whereas Si is intrinsic semiconductor. This is because :

[2012]

(a) In case of C the valence band is not completely filled at absolute zero temperature.

(b) In case of C the conduction band is partly filled even at absolute zero temperature.

(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.

(d) The four bonding electrons in the case of C lie in the third orbit, whereas for Si they lie in the fourth orbit.

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Answer:

Correct Answer: 14. (c)

Solution:

  1. (c) Electronic configuration of 6C

6C=1s2,2s22p2

The electronic configuration of 14Si

14Si=1s2,2s22p6,3s23p2

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



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