Modern Physics
Modern Physics
3rd Edition
ISBN: 9781111794378
Author: Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher: Cengage Learning
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Chapter 12, Problem 4Q
To determine

Explain about the band structures of metals insulators and semiconductors and tell how the band model give better understanding about the electrical properties.

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In a certain semiconductor, the valence band can be approximated by the function E(k) = Eo ak² and the conduction band can be described by the function E(k)= E₁ + 3k². Here E(k) is the electron energy and k is the wavevector. Plot E(k) for the two bands. What is the bandgap of this semiconductor? Is this a direct or indirect bandgap semiconductor?
A20. An intrinsic silicon semiconductor is uniformly doped with acceptors to a level of 2x1017 cm-³. At room temperature, the electron concentration in this semiconductor is found to be 5x10² cm-3. What is the intrinsic carrier concentration of this semiconductor at room temperature and describe qualitatively how would the electron concentration change if the temperature increased slightly?
exist is for valence electrons to "leap" into the conduction band with the Enoiteou Question 5 pplication of sufficient energy, legving a hole, or vacancy, behind in the valence band: Valence electron leaping into conduction band Conduction band valence band With sufficient thermal energy, these electron-hole pairs will form spontaneously. Af room temperature, however, this activity is slight. we may greatly enhance charge carrier formation by adding specific impurities to the semiconducting material. The energy states of atoms having different electron configurations do not precisely "blend" with the electron bands of the parent semiconductor crystal, causing additional energy levels to form. Some types of impurities will cause extra donor electrons to lurk just beneath the main conduction band of the crystal. These types of impurities are called pentavalent, because they have 5 valence electrons per atom rather than 4 as the parent substance typically possesses: Doped with a…
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