Energy bands in solids, transport phenomena in semiconductors, junction diode operation, Schottky diode, Bloch theorem, Kronig–Penney model, Brillouin zones, electron wave equation in periodic potentials - Question Bank
1. The metal-semiconductor junction in a Schottky diode is considered ohmic if the metal's work function is lower than the semiconductor's electron affinity for an N-type semiconductor. In this case, the barrier is:
2. The current-voltage characteristic of an ideal P-N junction diode under forward bias is described by the Shockley equation:
3. In a semiconductor, the intrinsic carrier concentration (ni) is strongly dependent on:
4. The Fermi energy (E_F) in a metal at absolute zero represents:
5. The condition for Bragg reflection of electron waves in a crystal lattice leads to the formation of:
6. The energy bands in solids are a result of the splitting of atomic energy levels due to:
7. A Schottky barrier is formed when a metal with a work function higher than that of the semiconductor is brought into contact with an N-type semiconductor. This barrier exhibits:
8. The reverse saturation current in a P-N junction diode is:
9. A forward-biased P-N junction diode conducts current easily because the applied voltage:
10. The conductivity of a semiconductor is given by σ = nqμ_n + pqμ_p, where n and p are electron and hole concentrations, and μ_n and μ_p are their respective:
11. In a semiconductor, the mobility of charge carriers refers to:
12. The electron wave equation in a periodic potential is a form of:
13. The first Brillouin zone is the smallest Wigner-Seitz cell in:
14. In the Kronig-Penney model, as the potential barrier height and width increase (while the product remains constant), the energy bands become:
15. The operation of a tunnel diode relies on the quantum mechanical phenomenon of:
16. The current in a Schottky diode is primarily carried by:
17. The characteristic 'knee' voltage in the forward I-V curve of a P-N junction diode represents:
18. A material with a very large band gap (e.g., > 4 eV) is typically classified as an:
19. The effective mass of an electron in a crystal lattice is different from its free space mass because of:
20. In the context of Bloch's theorem, the wave vector 'k' is related to the:
21. The concept of Brillouin zones is most relevant in understanding:
22. In a reverse-biased P-N junction, the applied voltage:
23. In a forward-biased P-N junction, the applied voltage:
24. The Fermi-Dirac distribution function describes the probability of an electron occupying a state with energy E at a given temperature T. At T=0K, this function is:
25. When an electron moves from the valence band to the conduction band, it leaves behind a vacancy called a:
26. The width of the forbidden energy gap in a semiconductor is approximately:
27. In the Kronig-Penney model, the energy bands are formed when the electron wave is:
28. The electron wave equation in a periodic potential differs from that in free space because:
29. The depletion region in a Schottky diode is formed at the interface between the metal and the:
30. Compared to a P-N junction diode, a Schottky diode typically has:
31. A Schottky diode is a type of diode formed by the junction of a metal and a:
32. The breakdown voltage in a P-N junction diode under reverse bias can occur due to:
33. The current that flows through a P-N junction diode under reverse bias is primarily due to:
34. Under reverse bias, a P-N junction diode has:
35. Under forward bias, a P-N junction diode has:
36. The operation of a junction diode is based on the behavior of the P-N junction under:
37. In an N-type semiconductor, the majority charge carriers are:
38. In a P-type semiconductor, the majority charge carriers are:
39. When a semiconductor is doped with trivalent impurities (e.g., Boron in Silicon), it becomes a:
40. Doping a semiconductor with pentavalent impurities (e.g., Phosphorus in Silicon) results in a:
41. In an intrinsic semiconductor at absolute zero temperature, the Fermi level is located:
42. The transport phenomena in semiconductors are primarily governed by the behavior of:
43. A semiconductor material typically has:
44. In the context of energy bands, a material is classified as a conductor if:
45. The width of an energy band in a solid is primarily determined by:
46. A Brillouin zone is defined as:
47. In a periodic potential, the allowed energy states for electrons form continuous bands separated by forbidden energy gaps. This phenomenon is a direct consequence of:
48. The Kronig-Penney model is a simplified model used to explain the formation of energy bands in solids by considering:
49. According to Bloch's theorem, the wave function of an electron in a periodic potential can be written in the form: