Questions tagged [semiconductor-physics]
Semiconductor physics is the branch of solid state physics that focuses on specific properties of semiconductors. It studies dynamics of different perturbations (mainly electrons and holes) in the semiconductor crystal and the ways to harness it in electrical circuits.
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Shockley Equation works better at higher temperatures
I have been doing some work as part of my undergraduate labs, and currently, the experiment is to determine the constant $e/k_B$ from the I-V response of a germanium PN junction. However, I've ...
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I don't really get transistors. How do they work exactly in the active region?
So in an NPN transistor, when the base-emitter is forward biased, and the base-collector is reversed biased, electrons from the emitter get to the base. That part I understand, electrons are the main ...
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Can doping significantly decrease a monolayer semiconductor's band gap to almost metallic levels?
I am currently an undergraduate student tackling DFT calculations on my 3x3 CsGeBr3 perovskite monolayer with Fe-doping and Biaxial Straining using Quantum Espresso thru BURAI. I have found out that ...
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Current Inside the Depletion Region Forward Biased PN Junction
For a forward biased PN junction, we assume the hole and electron currents are constant inside the depletion region when there is no generation or recombination in the depletion region (shown from the ...
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How can charge neutrality be maintained for a forward-biased PN junction?
When a PN junction is forward biased, majority electons diffuse into p region and majority holes diffuse into n region, if we impose quasi-neutrality, then we have that in the p and n regiosn the ...
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How can i calculate dangling bond density of Si plane?
I've researched how to calculate number of dangling bonds in Si plane (100) , (110), (111)...
I can't figure out how to approach.
Is there any way to do so?
I searched one report that in FCC structure ...
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Built-In Potential (Forward vs Thermal Equilibruim)
According to my book the built-in potential $V_{bi}$ for a PN junction under thermal equiliubrium is:
$$V_{bi}= \frac{KT}{q}In(\frac{n_{no}p_{po}}{{n_{i}}^2})$$
where $n_{no}$ and $p_{po}$ are the ...
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Would a diode more ideal than Shockley diode equation violate the second law of thermodynamics?
The Shockley diode equation describes the behavior of all diodes extremely well. Semiconductor p-n diodes and Schottky diodes are described by the very same equation. Furthermore, it applies to light ...
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Electric Field Far From PN Junction
According to Semiconductor physics and devices Book by Donald A. Neamen book. The electric field far from the space charge region is very small and most of the applied voltage happens across the space ...
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Current due to Ambipolar transport of excess carrier in semiconductors
I am reading Neaman's textbook and I am confused by the ambipolar transport phenomenon. According to what I have understood, if excess carriers are injected somehow into a doped semiconductor piece, ...
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Minority-carrier only injection into bulk semiconductor
If an n-type bulk semiconductor sample was injected from the side with holes. Such that holes are injected uniformly into a small region near the side surface of the sample. Does this excess minority ...
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Effect of any one dysfunctional diode in a bridge rectifier
In these bridge rectifiers what if a diode becomes like fully dysfunctional, and stops conducting totally in a direction. I was wondering if the output voltage will be like a half wave pulsating DC? ...
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Plotting curves of diode current against temperature
I have done I-V measurement at different temperatures on a diode, now I am trying to plot the $I_D$ vs temperature curve but varying $\eta$ (the ideality factor). I am not sure of the procedure though....
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Carrier Recombination Lifetime in Thermal Equilibrium
All the books I read talk about carrier recombination lifetime when the semiconductor material is pushed out of equilibrium. But let's say the material is in equilibrium ( where generation and ...
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How to determine the effective mass for multivariate dispersion relation? [duplicate]
Consider the 1D dispersion obtained by the tight-binding method:
$
E(k)=\epsilon_0-t\cos(ka)
$
$\epsilon_0$ is the on-site energy and $t$ is the hopping energy. To find the effective mass, you can ...
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