All Questions
Tagged with electricity semiconductor-physics
61
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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 ...
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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 ...
- 19
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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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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 ...
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Are thermistors and filament bulbs ohmic?
Conductors are ohmic if they have a constant resistance given that the physical conditions, such as temperature, are constant.
A filament bulb and thermistor are considered to be non-ohmic because ...
- 21
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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 ...
- 16.9k
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Doubt in working of p-type semiconductors
Correct me if I'm wrong, but as far as I know, in p-type semiconductors, first the excitation of an electron takes place from the valence band to the conduction band due to thermal energy, then this ...
- 28.1k
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Point resistance
The resistance of a given object is expressed through:
$$R=\rho\frac{l}{A}$$
I'm wondering if there is any quantity like resistance at a specific point. For example, $R$ for a copper wire with l=...
- 35.4k
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Does an electron physically flow? [duplicate]
In a DC current in a conductive wire, is it more accurate to think of one electron wiggling its way through a sea of electrons... or to think of one electron bumping into another, which bumps into ...
CommunityBot
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Simulate Band Bending and Band Alignment in Semiconductors
Are there softwares (simple ones preferred) where we can simulate the band alignments and band bending of a p-n junction, where we can vary properties of the junction materials such as carrier ...
- 126k
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Construction of Peltier tiles
I'm learning about the construction of Peltier tiles from Wikpedia. However, some of the statements in the article are not at all clear.
Here's the extract:
Two unique semiconductors, one n-type ...
- 3,022
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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 ...
- 7,203
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Differences in conductivity as temp rises for intrinsic vs extrinsic semiconductrs
For a doped semiconductor, near the end of the extrinsic temp region due to heightened effects of lattice scattering conductivity goes down "temporarily" (temperature wise).
What happens to the ...
- 7,057
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Why does current have to flow in the same direction?
If current is just the movement of charged particles, why do the all have to move in the same direction?
For example, if you reverse-bias a diode (connect the positive terminal to the n-type side ...
- 1,922
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How can I create an ohmic contact with selenium?
I would like to be able to measure the electrical resistance of selenium past its melting point, but to do this I need to create an Ohmic contact between the selenium and my multi-meter. What metals ...
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