All Questions
Tagged with semiconductor-physics experimental-physics
31
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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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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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How to separate electron and hole mobilities in a intrinsic semiconductor?
I read in textbooks that the electric conductivity of a semiconductor is $\sigma=q(n\mu_n+p\mu_p)$, where $q$ is an electron's charge, $n$ and $p$ are the concentrations of electrons and holes, $\mu_n$...
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The DOS effective mass
If we consider the spin-orbit coupling in semiconductors, it is known that the degeneracy of the valance band is lifted up and we got 2 sub-bands the light hole and the heavy hole that are still ...
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How to find hydrogen atoms concetration from a doping profile?
Hydrogen atoms passivate dopant atoms. I want to find hydrogen concentration from a calculated dopant profile for a p-type silicon Schottky junction. Does anyone know how to go about this?
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Hydraulic analogy for electrical compounds
I want a source (website or a book) where there are hydraulic simulation (or analogy) for all (or at least the most useful) electronic compounds?
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Electromagnetic wave and skin depth, skin effect
In EM theory concept of skin depth is induced which is a measure of how much a EM wave can penetrate the medium, from it arises the concept of skin effect which is for EM wave but we use this to ...
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Simulation of QW gain
For a student project, I need to compute and plot the gain of a semiconductor quantum-well.
In my case, I am interested to reproduce the results from Schwartz et al. (Investigation and comparison of ...
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How insulators and conductors were discovered?
I know Stephen gray has discovered insulator and conductor. But I want to know that how did he know which one is conductor and which one is insulator ? Please tell me the details how had he done that ...
user230720
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Why does the base-emitter voltage in NPN transistor become constant
The setup above shows the experiment that I have been working with. During the experiment, the current $i_c$ and the voltage $V_{be}$ were measured for increasing $V_{in}$. At some point, the current ...
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873
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How to maximize Peltier devices' cooling capacity?
I am currently working on a project requiring the use of Peltier devices. I have attached the cool side of the device to a copper plate and the hot side to a heat sink with a fan.
What would be the ...
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Photovoltaic cell - why is I-V curve so strange
Today I was doing practicals with PV cells and my team was measuring IV curve of a solar cell. The cell was not homogenously illuminated and the illumination was very strong.
Our measurements were ...
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I-V curve of Zinc oxide film deposited on glass
Good day! I'm looking for any suggestion about my research. So basically my research is about electrical properties of ZnO film deposited on glass via spray pyrolysis. I want to determine the ...
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Why is a $\frac{kT}{2}$ correction required to bandgap data?
An LED was cooled in a cryostat and the spectra measured at different temperatures. Plotting intensity vs current allowed us to find the energy at peak intensity, which we equate to the bandgap. Then ...
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What can an LED electroluminescence emission spectrum be used for?
We did a lab session where we obtained such a spectrum. Why would this be of interest?
It's possible this wasn't explained because we have very little background knowledge of how LEDs work, so the ...
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