Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN: 9781337553292
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Question
Chapter 42, Problem 27P
(a)
To determine
The lowest frequency photon that can promote an electron from the valence band to
(b)
To determine
The wavelength of the photon.
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For a certain semiconductor, the Fermi energy is in the middle of its band gap. If the temperature of the semiconductor is 285 K, find the probability that a state at the bottom of the conduction band is occupied if the band gap is 0.005eV.
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Chapter 42 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 42.1 - For each of the following atoms or molecules,...Ch. 42.2 - Prob. 42.2QQCh. 42.2 - Prob. 42.3QQCh. 42 - Prob. 1PCh. 42 - Prob. 2PCh. 42 - Prob. 3PCh. 42 - Prob. 4PCh. 42 - Prob. 5PCh. 42 - The photon frequency that would be absorbed by the...Ch. 42 - Prob. 8P
Ch. 42 - Prob. 9PCh. 42 - Prob. 10PCh. 42 - (a) In an HCl molecule, take the Cl atom to be the...Ch. 42 - Prob. 12PCh. 42 - Prob. 13PCh. 42 - Prob. 14PCh. 42 - Prob. 15PCh. 42 - Prob. 16PCh. 42 - Prob. 17PCh. 42 - Prob. 19PCh. 42 - Prob. 21PCh. 42 - Prob. 22PCh. 42 - Prob. 23PCh. 42 - Prob. 24PCh. 42 - Prob. 25PCh. 42 - Prob. 26PCh. 42 - Prob. 27PCh. 42 - Prob. 28PCh. 42 - Prob. 29PCh. 42 - Prob. 30PCh. 42 - Prob. 32PCh. 42 - Prob. 33PCh. 42 - Prob. 35PCh. 42 - Prob. 36APCh. 42 - Prob. 37APCh. 42 - Prob. 39APCh. 42 - Prob. 40APCh. 42 - As an alternative to Equation 42.1, another useful...
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- Why does the horizontal Line in the graph in Figure 9.12 suddenly stop at the Fermi energy? Figure 9.12 (a) Density of state for a free electron gas; (b) probability that a state is occupied at T = 0 K; (c) density if occupied states at T = 0 k.arrow_forwardWhat is the main difference between an insulator and a semiconductor?arrow_forwardDetermine the thermal-equilibrium concentrations of electrons and holes in silicon at T =300 K if the Fermi energy level is 0.2 eV above the valence-band energy. Assume that the bandgap of semiconductor is 1 eV. Nc=2x1019 cm-3 and Nv=1x1019 cm-3. Take kT=25.875 meVarrow_forward
- In a silicon lattice, where should you look if you want to find (a) a conduction electron, (b) a valence electron, and (c) an electron associated with the 2p subshell of the isolated silicon atom?arrow_forwardAs the doping density of a semiconductor increases, the :mobility generally Stays the same Increases Decreases First increases, then decreases First decreases, then increasesarrow_forwardThe occupancy probability at a certain energy E1 in the valence band of a metal is 0.60 when the temperature is 300 K. Is E1 above or below the Fermi energy?arrow_forward
- the carrier distribution in the conduction band is:nc(E) = gc(E) . f(E) a) For a non-degenerate semiconductor, show that nc(E) has a maximum at E = Ec + ½ kT b) What is the ratio of carrier distribution at E = Ec + kT to that of the max value ?arrow_forwardWhat mass of phosphorus is needed to dope 1.0 g of silicon so that the number density of conduction electrons in the silicon is increased by a multiply factor of 106 from the 10^16 m-3 in pure silicon.arrow_forward
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