Physics for Scientists and Engineers
Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
Question
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Chapter 38, Problem 42P

(a)

To determine

The energy gap between the bands in Lead Sulfide.

(b)

To determine

The temperature of the electron.

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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?
Calculate the conductivity of an intrinsic silicon at room temperature. If ten electrons out of 1010 electrons in Valence Band move to Conduction Band. Given the silicon density is (2.33×10 Kg/m³), the silicon atomie weight is (28.086), the electrons mobility is (0.15 m/V.sec.), and the holes mobility is (0.05 m2/V.sec.).
When a photon enters the depletion zone of a p-n junction, the photon can scatter from the valence electrons there, transferring part of its energy to each electron, which then jumps to the conduction band. Thus, the photon creates electron–hole pairs. For this reason, the junctions are often used as light detectors, especially in the x-ray and gamma-ray regions of the electromagnetic spectrum. Suppose a single 662 keV gamma-ray photon transfers its energy to electrons in multiple scattering events inside a semiconductor with an energy gap of 1.1 eV, until all the energy is transferred. Assuming that each electron jumps the gap from the top of the valence band to the bottom of the conduction band, find the number of electron – hole pairs created by the process.
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