Question
Consult your reference library and find another explanation of hole versus electron flow. Using both descriptions, describe in your own words the process of hole conduction.
Step 1
Hole Conduction: Hole conduction is the process by which electric current flows through a semiconductor material due to the movement of positively charged "holes" in the material. These holes are essentially vacancies in the atomic structure where an electron is Show more…
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Consider a semiconductor at $T=300 \mathrm{~K}$. ( $a$ ) (i) Determine the electron diffusion coefficient if the electron mobility is $\mu_{n}=1150 \mathrm{~cm}^{2} / \mathrm{V}-\mathrm{s} .(i i)$ Repeat ( $i$ ) of part $(a)$ if the electron mobility is $\mu_{n}=6200 \mathrm{~cm}^{2} / \mathrm{V}-\mathrm{s} .(b)(i)$ Determine the hole mobility if the hole diffusion coefficient is $D_{p}=8 \mathrm{~cm}^{2} / \mathrm{s}$. (ii) Repeat (i) of part ( $b$ ) if the hole diffusion coefficient is $D_{p}=35 \mathrm{~cm}^{2} / \mathrm{s}$
In direct-gap semiconductors, such as GaAs, electrons near the bottom of the conduction band and valence-hole states near the top of the valence band have momenta near zero. In indirect-gap semiconductors, such as $\mathrm{Si}$ and Ge, these electron and hole states have very different momenta. (a) Compute the momentum of a visible-wavelength photon. (Recall that for photons, $p=E / c$. $)$ (b) Compute the momentum of an electron with a wavelength of $0.3 \mathrm{~nm}$, which is typical for a conduction electron in a semiconductor. (c) Explain why conservation of momentum forbids production of photons from electron-hole recombination in silicon.
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Semiconductors
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