Assignment Questions
Semiconductors
1. What are semiconductors?
2. What are the types of Semiconductor?
3. What are conductors? Give two examples Semiconductors?
4. Give examples?
5. What are insulators? Give two examples?
6. What is intrinsic semiconductor?
7. What is an extrinsic semiconductor?
8. At what temperature would an intrinsic semiconductor behave like a perfect insulator?
9. Distinguish between n-type and p-type semiconductors
10. Draw relevant energy level diagrams of n-type and p-type semiconductors
11. What is a hole?
12. Name the charge carriers in the following at room temperature: (i) conductor (ii) semiconductor
13. Name the majority charge carriers in p-type semiconductors.
14. Differentiate between intrinsic and extrinsic semiconductors with examples.
15. Name the factors on which electrical conductivity of a pure semiconductor depends at a given temperature.
16. Differentiate between conductor, semiconductor and insulator with suitable examples.
17. What is negative temperature coefficient of resistance?
18. How does the conductivity of a semiconductor change with rise in its temperature?
19. Write the properties of semiconductors.
20. Differentiate between Elemental semiconductors and Compound semiconductors
21. Explain direct bandgap semiconductor and indirect bandgap semiconductor
22. Differentiate between direct bandgap semiconductor and indirect bandgap semiconductor.
23. What is the basic difference between metal and semiconductor?
Doping
1. What is doping?
1. Name one dopant which can be used with germanium to form an n-type semiconductor.
2. What are dopants?
3. What are pentavalent and trivalent impurities or dopants
Carrier Generation and Recombination
1. Define Carrier Generation.
2. Define Carrier Recombination.
3. Write differences between Carrier Generation and Recombination
4. What is trap in semiconductor?
Diffusion and drift
1. Define drift and drift current in semiconductors.
2. Define diffusion and diffusion current in semiconductors.
3. What is diffusion length.
4. Differentiate between drift and diffusion currents.
5. Explain carrier transport in semiconductors.
6. What is drift and diffusion current in semiconductor?
7. What is the drift voltage?
8. What does the diffusion coefficient mean?
9. Give the expression for drift current density ยต due to electron.
10. write the equation for drift current density due to holes.
11. write the equation for diffusion current density due to electron.
12. write the expression for diffusion current density due to holes.
13. Explain Fick's Law
Fermi energy
1. What is Fermi level?
2. What is Fermi energy?
3. Explain thermal equilibrium in in semiconductors.
4. write the equation for the Fermi level energy in n – type semiconductor.
5. What is Fermi’s golden rule?
6. Discuss in detail the dependence of Fermi level on carrier concentration and temperature.
7. What do you mean by occupation probability?
8. Write the expression for the Fermi level energy in n – type semiconductor.
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