All Questions
Tagged with electricity semiconductor-physics
61
questions
-1
votes
1
answer
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 ...
- 21
1
vote
4
answers
16k
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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. ...
- 11
1
vote
1
answer
1k
views
Question on Shockley's equation for FETs
I'm currently studying FETs (Field Effect Transistors) in Navy school. What I know so far is that in FETs, $V_{gs}$ is reversed biased, creating a depletion zone. What this means in plain English is ...
- 121
2
votes
1
answer
715
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How to check the ohmic contact to the film?
I have a thin semiconductor film deposited on an isolating substrate. I would like to check different metals to find out do they form the ohmic contact or Schottky barrier.
What is the best way to do ...
- 21
1
vote
0
answers
84
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How does Passivation in Mercury-arc-valve cause "diode" behavior
Does passivation of lead anodes cause them to become semiconductors?
Or even become diodes (eg. a p-n passage)?
How does this work on an atomar level?
This question has been risen by trying to ...
- 243
3
votes
1
answer
11k
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How does temperature affect an electrical current
Synopsis
I have read an interesting article J. Halderman et al. "Lest we remember: cold boot attacks on encryption keys" in computer science regarding cold booting.
The paper discusses how the use ...
- 133
1
vote
2
answers
2k
views
What actually happens at the microscopic level in a Zener diode in reverse bias?
A Zener diode is used as a voltage stabilizer. The graph of current vs voltage of Zener diode clearly shows that there is a constant voltage across Zener after the breakdown voltage as the current ...
- 3,905
5
votes
3
answers
534
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What can justify the decrease of the electrical conductivity with the increase of light intensity?
I have currently been working with a sample that "appears to" decrease its resistance when I cover it and protect it from light.
Basically it presents the opposite behaviour of a photoresistor.
What ...
- 1,334
0
votes
2
answers
159
views
Need an intermediate resistivity part/material
I need a part or material for a planned experiment (the experiment is similar to those described in my articles http://arxiv.org/abs/1208.0066 and http://arxiv.org/abs/1109.1626 ). The problem is that ...
- 27.1k
2
votes
3
answers
2k
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Producing electricity from all wavelengths of electromagnetic spectrum
Is it possible to produce electricity from all wavelengths of electromagnetic spectrum beside visible light ?Like using gamma rays or x-rays .
- 29
5
votes
2
answers
29k
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How does current flow from the emitter, through the base and to the collector in a NPN transistor?
So, I understand that for a NPN transistor to work the emitter-base junction needs to be forward biased and the collector-base junction needs to be reverse biased. I understand how current flows from ...
- 59
8
votes
2
answers
1k
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Ionized Depletion Region, Why aren't those charged being excited?
Ok so I understand the PN junction, and how when 2 Semiconductor materials are placed together the Electrons will jump into the Holes near the junction creating a Negatively Ionized Atoms on the P-...
user20118
0
votes
1
answer
609
views
Carrier Electrons Generation and Recombination Time
When a Electron gets promoted to the conduction band from valence band (In generation) lets say for example in Silicon at room temperature.
Is there any way to determine (on average) how long it will ...
user20118
3
votes
1
answer
335
views
Theory of Space Charge in a Planar Diode
A planar diode in a vacuum bulb can support current in only one direction. To even get current flowing, you have to heat up the cathode filament to excite the electrons. However, once current is ...
- 143
2
votes
1
answer
3k
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How is contact resistivity defined for a Schottky contact, or the Schottky barrier height for an ohmic contact?
Based on the transfer length method (TLM), one can accurately calculate the contact resistivity for an ohmic contact, by evaluating the absolute resistance measured through the test structure and ...
- 131