All Questions
Tagged with electricity semiconductor-physics
61
questions
2
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945
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Why is the diffusion length defined for minority charge carriers only?
As far as I could infer from the solar cell literature, when talk is about the "diffusion length", only the minority carriers are concerned.
Is there a diffusion length defined for majority ...
1
vote
1
answer
885
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Why are we even interested in solar cells under bias voltage?
I couldn't find any answer on this super basic question.
Some people on the internet say that you would not put a solar cell in an array under bias, others say that they bias themselves, but I don't ...
0
votes
0
answers
24
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Understanding a charged isolator
If an isolator gets charged (e.g. by rubbing it to an other isolator), it can get charged. If it is negatively charged, I would expect the additional electrons to be in the conduction band, so that ...
- 171
2
votes
1
answer
165
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What are the different driving forces behind a solar cell and how is a voltage created?
I have a hard time understanding the I-V curve of a solar cell. I dont understand how in an short circuit a current can happen although there is no voltage? Isn't voltage the requirement for a current,...
- 65
0
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1
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2k
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How to know a semiconductor is p type or n type from hall effect calculations? [closed]
Using the hall effect calculations how can we determine a semiconductor is p type or n type
1
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1
answer
284
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Is there a potential difference across the bulb after current passed through a diode?
I understand that voltage can exist without current so what I want to ask is will there be a potential difference across the bulb(situated after the diode) when a batteries supplied energy through a ...
- 113
0
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1
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265
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Why do diodes block current in a single direction?
It seems like all the explanations for diode mechanics simply state that if N-type semiconductor is connected to V+ of the battery, the depletion region grows so current cannot pass.
It seems, ...
- 815
0
votes
0
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35
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Is activation voltage the sum of voltage required to collapse depletion layer and band gap energy?
Is the energy released when an electron moves from the valence to conductance band states the activation voltage or is activation voltage the energy required for electrons to overcome the depletion ...
- 31
0
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1
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74
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How do electrons exit LEDs? Aren't they in the valence energy state?
If a conducting electron reduces to the valence band in an LED, where does it get the energy to go back to the conductance band upon leaving the diode so current can flow?
I'm confused as to how ...
- 31
0
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1
answer
237
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Electric fields and electric potentials in semiconductors
The zener diode is heavilier doped than a normal diode , that is why its depletion region is smaller than the delpetion region of a normal diode and that is why the electric field is very strong.Zener ...
- 165
0
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0
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76
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Zener diode electric field working principle
Well I recently saw a video from khan academy about zener diodes.This video was suggested by another member of Stack Exchange Physics who I thank him very much . But I didnt understand some things:...
- 165
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1
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76
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At what pressure do semiconductors break down? [closed]
So let's say you were going to send some electronics to the bottom of the ocean, 3-5km down. This would be about $5km*1000kg=5Mkgf/m^{2}$. So at what pressure do circuit boards, transistors, etc stop ...
- 11
3
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1
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1k
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How can depletion region be formed at the center?
Let's consider an electron at the junction in the n-type region. As it moves into the p-type we say it leaves behind a positive ion and hence in this way electrons at the junction in the n-type create ...
- 41
2
votes
1
answer
983
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Confusion regarding Hall effect in semiconductors
In many places, it's mentioned that in hall effect, the holes move under the influence of magnetic field in the direction as shown in the figure. In this figure itself, the bound electrons move in the ...
- 31
0
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1
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3k
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Hall-Voltage behaviour with increasing temperature
I have a question relating to this diagram:
It shows the relationship between Temperature and Hall-Voltage of a P-doped Germanium Plate. The electron density n is constant from 10°C to 50°C, that's ...
