1. Rank (qualitatively) metals, ceramics, polymers, and semiconducting materials
ID: 834990 • Letter: 1
Question
1. Rank (qualitatively) metals, ceramics, polymers, and semiconducting materials according to electrical conductivity (from highest to lowest range of values).
2. Elements in the Periodic table are arranged based on what?
3. Choose one of the answers below when the atoms in a solid are
separated by their equilibrium distance.
4. The Frankel and Schottky defects are found in what type of
materials?
5. Extensive solubility is a rare phenomenon that occurs in solid
solutions. Identify two favorable conditions for this phenomenon to
occur.
6. Identify possible parameters that control the diffusion process.
7. In solid materials electrons move slower compared to in vacuum.
Explain why electron motion is slower in solid materials?
8. In a semiconductor the band gap energy is much smaller than -----
------------------- and greater than --------------
9. Which type of charge carrier will be introduced into a
semiconductor by the presence of an acceptor impurity?
10. For an n-type semiconductor, where is the Fermi level located?
11. When two semiconductors are brought together what is the indication that a junction being formed between those materials?
12. What two critical functions are performed by a transistor device?
Explanation / Answer
2. Atomic Number
3. The force of attraction between the atoms is Maximum
4. Crystalline materials
5. the following conditions
are favorable for extensive solid solubility of
one element in another:
(a) the diameters of the atoms of the elements
must not differ by more than about 15%
(b) the crystal structures of the two elements
must be the same
(c) no appreciable difference in the
electronegativites of the two elements
(d) two elements should have the same valence
6. Diffusion is the net movement of a substance (e.g., an atom, ion or molecule) from a region of high concentration to a region of low concentration. It depends on temperature, concentration of solution, pressure.
7. when an electric field is applied, each electron is accelerated by the electric field. If the electron were in a vacuum, it would be accelerated to faster and faster velocities (called ballistic transport). However, in a solid, the electron repeatedly scatters off crystal defects, phonons, impurities, etc. Therefore, it does not accelerate faster and faster; instead it moves with a finite average velocity, called the drift velocity. This net electron motion is usually much slower than the normally occurring random motion.
8.
In a semiconductor the band gap energy is much smaller than metal and greater than non metal.
9. Hole
10. In an n-type semiconductor, the Fermi level is greater than that of the intrinsic semiconductor and lies closer to the conduction band than the valence band.
11. One should be n-type semiconductor and other should be p-type semiconductor.
12. The logic gating function (e.g., AND) and the amplifying function are performed by transistors.
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