COLLEGE PHYS. VOL 1 LLF W/MODMAST >IC<
COLLEGE PHYS. VOL 1 LLF W/MODMAST >IC<
10th Edition
ISBN: 9781323149454
Author: YOUNG
Publisher: PEARSON C
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Chapter 29, Problem 25P
To determine

Find the number of electrons excited from valence band to conduction band.

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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.
In an n-type silicon, which of the following statement is true:(a) Electrons are majority carriers and trivalent atoms are the dopants.(b) Electrons are minority carriers and pentavalent atoms are the dopants.(c) Holes are minority carriers and pentavalent atoms are the dopants.(d) Holes are majority carriers and trivalent atoms are the dopants.
What 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.
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