Which of the following does NOT describe semiconductors? Their band gaps are bet
ID: 910099 • Letter: W
Question
Which of the following does NOT describe semiconductors? Their band gaps are between metals and insulators Doped p-type and n-type semiconductors are more conductive than semiconductor materials that are not dop Their band gaps increase as particle size decreases in the 1-10 nm range. They are superconducting when doped with a small amount of phosphorus They usually have an average number of 4 valence electrons QUESTION 17 representation shown. the center small sphere represents an atoms nucleus What does the rest of the figureExplanation / Answer
We're going to analyze all the statements and then answer the question:
1. The band gaps of a semiconductor are between a filled valence band and an empty conduction band. A metal and an insulator aren't bands. So, this doesn't describe a semiconductor.
2. The semiconductors are doped to enhance their conductivity, so, p-type and n-type of semiconductors are more conductive. This statement describes perfectly a semiconductor.
3. When you increase the particle size, you increase the number of protons. Potential between protons and electrons increase with larger size particles, thus pull the valence and conduction electrons nearer to the center of the particles and this decreases the band gap. This statement is suitable for semiconductors.
4. Phosphorus doping leads to a n-type of semiconductor and it is one of the most important materials for doping. In the point 2, we said that this doping increases the conductivity, so, this statement is true for the semiconductors.
5. The semiconductors usually have an average of 4 valence electrons, such as silicon and germanium, which are really important semiconductors. This statement describes a semiconductor.
In conclusion, the statement that doesn't describe a semiconductor is the first one. The rest of them are important and correct characteristics.
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