AIPMT PRELIMS 2012 Physics Semiconductors MCQ Question
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
The four bonding electrons in the case of C lie in the third orbit, whereas for Si they lie in the fourth orbit
In case of C the valance band is not completely filled at absolute zero temperature
In case of C the conduction band is partly filled even at absolute zero temperature
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
Correct Answer
Detailed Explanation
Carbon's electrons are in the second orbit, leading to a larger band gap compared to silicon, whose electrons are in the third orbit, making Si a semiconductor.
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