GATE EC 2023 Set 1 — Question 17
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Electronic Devices → Semiconductor Physics → Energy Bands
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Question
For an intrinsic semiconductor at temperature , which of the following statement is true?
Correct answer
(A) All energy states in the valence band are filled with electrons and all energy states in the conduction band are empty of electrons.
Solution
At absolute zero temperature (), an intrinsic semiconductor behaves like a perfect insulator. In this state, all electrons are tightly bound in the valence band, completely filling all available energy states in the valence band. Consequently, there are no free electrons to move into the conduction band, meaning all energy states in the conduction band are empty of electrons.Therefore, the correct statement is that all energy states in the valence band are filled with electrons and all energy states in the conduction band are empty of electrons.Option (A) accurately describes this condition.
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