Given a semiconductor band structure E-k diagram as below.. For point A, B, and C: (a) compare the absolute value of electron (or hole) velocity; (b) comparing the effective mass. (Assume all points are near k=0 and all bands have parabolic relation, E=ak²+b) Conduction band Point A Point B Heavy hole Valance band Point C Light hole
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- (a) In the band theory of solids, describe the band structures of: conductors, insulators, and (intrinsic) semiconductors b) Explain how doping may be used to create extrinsic n-type and p-type semiconductors. c) Describe the structure and operation of a p-n junction as a diode rectifierDescribe the difference in band structure between an insulator and a semiconductor. (Explain with diagram) In an insulator the band gap is relatively wide so that, at room temperature, electrons do not have sufficient energy to cross it. There are therefore no electrons in the conduction band. In a semiconductor the band gap is sufficiently narrow for electrons to be able to cross it at room temperatures. The conduction band therefore contains some electrons.For Ge semiconductor, assume the Fermi energy level is 0.1 eV below the conduction band energy Ec. Let the absolute temperature T for items i and ii be 200 K. i. Find the number of quantum states between Ec and Ec +0.1x4.6xkbT. ii.Determine the probability of a state being empty of an electron at Ec+0.1x4.6x kbT. ii. Find the temperature at which there is an electron at the state Ec+0.01x4.6x kbT with probability 30%. iv. Repeat item iii by using the Boltzmann approximation rather than the Fermi-Dirac distribution. v. Find the difference in temperature between items iii and iv above and express this difference as percentage.
- . When UV photons with 380 nm wavelength strike on a semiconductor, a red photon emission from the semiconductor is observed. Explain the photon emission process in this semiconductor on the band diagram.I need the answer as soon as possibleHow does a semiconductor vary from a conductor and an insulator, and what does it do? In your explanation, including a chart.
- Use T if it's True and F if it's False. Justify I. A semiconductor is characterized by having a very wide forbidden band, between conduction and valence.II. The band of the Energetic Interval where there are those electrons that can move freely and are free from the attraction of the atom is called conduction.III. In a semiconductor with donor atoms (for example P in Si), the donor level is just below the conduction band.IV. A diode will conduct current in only one direction and act as an open circuit when the current tries to move in the opposite direction.If the uppermost band to contain electrons is partially filled at T=0 K, and the gapbetween that band and the next lowest band is 0.8 eV, what is the material a metal,an insulator, or a semiconductor and explain using band level diagramhow does a semiconductor behaves at 0K? Explain your answer.