Underline all the correct answers. Explain why an answer is correct or why it is

Question

Underline all the correct answers. Explain why an answer is correct or why it is wrong Problem 1. If a Si Wafer is at OK, then the valence and conduction band are (00) 1. Both are completely empty 2- Both are completely filled 3- Both are partialy empty. 4 Both are partially filled. 5 None of the above 6- All of the above 1-4 1- CB band is completely empty and VB is completely filled 2 VB band is completely empty and CB is completely filled 3- CB band is partially empty and VB is completely filled 4 VB band is partially empty and CB is completely filled. 5 None of the above 6 All of the above (1-4) 1- CB band is partially filled and VB is completely filled 2 VB band is partially filled and CB is completely filled 3- CB band is partially empty and VB is partially filled 4 VB band is partially empty and CB is partially filled. 5 None of the above 6 All of the above (1-4) English (uS) 0 F3 OOO FA F5 F6 F7 FB

Explanation / Answer

At absolute zero, valence band of any intrisic semiconductor is completely filled whereas conduction band is completely empty. In other words at 0K, probability of a valance band electron getting knocked up to move into conduction band is null.

In fact an intrisic semiconductor such as Silicon crystal differs from an insulator in that, that at any temperature above absolute zero, there is a finite probability that an electron in the lattice will be knocked loose from its position, moving up into conduction band, leaving behind an electron deficiency called a "hole".

So answers are as below :-

(i) 5

(ii) 1

(iii) 5

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