All Questions
Tagged with semiconductor-physics electric-fields
32
questions
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Why would a depletion "layer" form in a PN junction?
I understand that electrons diffuse from the N to the P region due to the concentration difference. This diffusion of electrons creates an electric field opposing further diffusion.
What I don't ...
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1
answer
55
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Net electric field inside a photovoltaic cell under load
In a photovoltaic cell is basically a pn-junction where free electrons are created by a photoelectric effect.
Now I am interested to understand the electric field inside the depletion layer for ...
- 1,702
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23
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How would surface dipoles change the internal potential in a conducting sphere?
In the nanoscience literature, there is a model of semiconductor nanoparticle doping which ascribes the effect to surface dipoles shifting the absolute state energies relative to the environmental ...
- 116
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The electric Field inside PN junction in reverse bias
In the unbiased PN junction the electric Field inside the depletion region is just due to the fixed charges inside it
But what happens in case of reverse
basing ?
In case of reverse bias the reverse ...
- 597
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Confusion regarding on whether to include conduction charges(intrinsic to the material) as a part of bound charges in the calculation of polarization
Consider a semi-conductor in which conduction is mainly due to free electrons(valence electrons that are free to roam throughout the material) , and since it's a semi-conductor say not all atoms ...
- 109
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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
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1
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40
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Diffusion current because of internal field of semiconductor
Suppose we have an isolated n-type semiconductor having varying concentrations of carriers over x. After some finite time, the concentration becomes uniform for a given constant temperature. We ...
- 21
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353
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Charge density within a PIN diode
Consider the following problem regarding the p-type -intrinsic - n-type (PIN) diode from the Semiconductor Devices fundementals text book:
According to the solution manual the charge density is given ...
- 103
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73
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3 dimensional diode $E$ field profile
While deriving the electric field profile of a diode, 1D Gauss's Law is typically used:
$$\frac{dE}{dx}= \frac{\rho}{\varepsilon_0}.$$
However, the diode is at least 2-dimentional and, in real world, ...
- 513
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219
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How can NO charge carriers exist in the depletion region?
I learned that no charge carriers exist in the depletion region of a PN junction due to the balance between the diffusion current and the drift current due to the electric field created by charged ...
- 471
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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
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49
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Where does the drift current in a pn juntion come from?
I know I know. There are around 4 similar questions on here, but they do not properly answer my question.
I'd like to know where the drift current in a pn juntion (no bias) comes from. From what ...
- 23
1
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252
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Electric field in diode
I read that the electric field in a diode aids the flow of minority carriers (drift current). However, why is the eletric field direction simply represented with a single arrow? Shouldn't it look like ...
- 25
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3
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Electric field inside a p-n junction
In the diagram shown below it shows that as holes from p goes into n, it induces an electric field from n to p direction. Now i am not able to understand this correctly, the only reasons holes went ...
- 352
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283
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Why is the barrier potential and electric field from n side to the p side?
In the above image taken from my class notes you can see that I have been taught that when a semi-conductor is doped with both P-type impurity and N-type impurity, one on each side, the barrier ...
- 296