All Questions
Tagged with semiconductor-physics potential
18
questions
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Wavefunctions of quantum point contacts
I have a question about the potential and wave functions of discrete energy levels of quantum point contacts. Assuming one has a rectengular potential well:
Can the potential of the QPC be assumed to ...
- 45
2
votes
2
answers
92
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Does KVL don't hold in pn junction reverse bias?
Does KVL hold in pn junction reverse bias because any reference about semiconductor physics provide that figure
if we apply KVL around the loop won't be zero it will be equal to $V_{bi}$
then how KVL ...
- 597
1
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1
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38
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Does the built-in potential inside a diode change by making bias?
under thermal equilibrium the pn junction have a built-in field let say it's $E_{1}$ , if we make a reverse bias the external battery provide a permanent field $E_{2}$ , so the total field inside the ...
- 597
1
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Reason for Voltage drop in Depletion Region in a PN Junction [closed]
So I've been reading about the PN Junction and depletion region quite a lot, but I haven't really found a concrete explanation for the existence of a Voltage Drop, or Barrier Potential associated with ...
- 11
1
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0
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172
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Applications of the Kronig-Penney Model [closed]
I would like to know some applications of the Kronig-Penney Model and what parameters (effective mass, width...) are interesting to change in order to study those applications.
- 11
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0
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106
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Why does the bottom of the conduction band correspond to the potential energy of an electron?
While proving that Fermi level is constant throughout any system in thermal equilibrium, all the books I saw the proof in (for example, Sze and Shur) assume the following:
the bottom of the ...
- 513
2
votes
1
answer
129
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How is electrostatic potential distributed along a circuit element?
Suppose we have a diode circuit like that:
Suppose the voltage has magnitude $\varphi$ and one end of the wire has potential zero.
How will the potential be distributed throughout the diode?
Does $\...
- 513
0
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0
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57
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Three Layer PN Junction
I am dealing with a PN junction which consists of these 3 layers:
An N-doped region with $N_D=5\times10^{18}cm^{-3}$
A lightly P-doped region with $N_{Al}=1\times10^{15}cm^{-3}$ with a thickness of $2\...
- 297
1
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0
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53
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Depletion width of linearly doped PN-junction with unequal doping gradient
I am trying to find the expression for the width of the depletion layer as a function of bias voltage $V_{bi}$ for a PN-Junction with linear doping gradient but where the gradient is not the same for ...
- 297
4
votes
1
answer
1k
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How does the Fermi level of different materials reach equilibrium when in contact?
I'm a college student studying semiconductors. I can't understand what is happening inside the materials when two or more different materials are in contact. Can I get some help?
So, basically at ...
- 43
0
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0
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123
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Electrostatic potential in a semiconductor
I was thinking about a very simple question. Imagine we have a semiconductor "embedded by vacuum". Regarding this situation, I was thinking what is the potential felt by the electron ...
- 137
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54
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If we connect the two terminals of a semiconductor diode with a simple wire, then will the current flow? [duplicate]
We know that inside a semiconductor diode, there is an internal electric field from the N side to the P side. This implies that the N side is at a higher potential than the P side of a semiconductor ...
- 2,517
1
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1
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89
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How is there a -0.7V charge gap in a diode?
According to physics books, the negative charge in the N-type and the positive charge in the P-type semiconductor causes some electrons and holes to cross over to the other side. Then, apparently, the ...
- 43
2
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1
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278
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Can we observe the p-n Junction voltage Drop?
The question is in the title, to clarify: I know that in a P-N-junction, at the boundary, there is going to be a voltage drop in thermal equilibrium. I also know that we can't measure this voltage ...
- 6,763
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Do energy levels such as $E_c$, $E_v$ have negative values in semiconductors?
In energy band diagram of a semiconductor, do energy levels such as $E_c$, $E_v$ have negative values?
Also, why electrons in semiconductor have energy?
What is the formula for energy of an ...
- 81