All Questions
Tagged with electricity semiconductor-physics
61
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Do you get correct graph of transfer characteristic, if you take +ive Vds(constant) value instead of -ive. As mostly CNTFETs are p-chnl FET
I'm studying transfer characteristic curve of CNTFET to get value for mobility, S.S, etc. According to my basic background knowledge, NMOS curves lie in the 1st quadrant. While for PMOS they lie in ...
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1
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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 ...
CommunityBot
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2
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Can we measure resistance of a diode using Ohm's law $V=IR$ for a specific value of voltage and current?
As a diode doesn't follow $V$ proportional to $I$, I was wondering if we can use Ohm's law to calculate its resistance for a specific set of voltage and current, as its resistance varies as per the ...
- 57.2k
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Will there by a voltage drop in the p-type in the diode?
Assume we have a pn diode, and we have forward bias so that we get electricity through the diode.
My question:
Will there be a voltage drop over the p type? (NOT the depletion laywer, but the rest of ...
- 1,798
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1
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724
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Why do electron holes move away from heat?
I'm currently learning about thermoelectric generators and I learned about the two p and n semiconductors. I understand how the n-type semiconductors works which is that when one side gets heated then ...
- 51.4k
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4
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448
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PN junction: not sure to understand why reverse-biais lead to negligible current
My question is very highly related to Why doesn't current flow in reverse biased diode?
Basically, I would like to understand in more depth John Rennie answer. At $t=0$, I consider a PN junction ...
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1
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730
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What is the relation between the short-circuit current and the band gap energy in solar cells?
For the VOC it is:
VOC = E_g - something,
where something is positive and depends on the Urbach energy. Otherwise it should be linear:
https://aip.scitation.org/doi/pdf/10.1063/1.49397
For the ISC I ...
- 3,299
2
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1
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78
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Why don’t illuminated series connected (photo-)diodes bias each other?
When you connect, let's say, three photodiodes or solar cells, with a load, and you measure the voltage across the middle photodiode. Will the voltage change if
the adjacent cells are in the dark
if ...
- 3,299
1
vote
1
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895
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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 ...
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2
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1
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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 ...
- 3,299
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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
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1
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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,...
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-1
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1
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183
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How does the solar cell work?
I know that a solar cell consists of a transistor (NP). First step it creates a barrier between the n type and the p type junction. Then the sunlight (i.e, the photons) supply energy to the electrons ...
- 207k
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4
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How is current produced in semiconductors or metals?
I think current is the movement of electrons through the wire or semiconductor, thus when I press the switch of the light bulb the electrons go from positive part to tungsten and light is produced. ...
- 60.3k
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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
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