All Questions
Tagged with electricity semiconductor-physics
61
questions
2
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Why in a conductor increase in temperature makes the atoms vibrate but in a semiconductor the kinetic energy of the free electrons is increased?
When temperature is increased in case of a semiconductor the free electron gets more energy to cross the energy gap to the conduction band from the valence band.so now more electrons can go easily to ...
- 31
0
votes
3
answers
249
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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 ...
- 426
0
votes
1
answer
74
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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=...
- 3
1
vote
2
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952
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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 ...
- 445
2
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2
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3k
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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 ...
user139621
1
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0
answers
1k
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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 ...
- 11
1
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3
answers
6k
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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 ...
- 1,307
0
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2
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3k
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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 ...
- 165
1
vote
1
answer
66
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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 ...
- 127
0
votes
0
answers
37
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How am I obtaining silicon with resistivity proportional to the number of conduction electrons?
The resistivity of silicon is given by
$$\large\rho=\rho_0e^{\Large{{\frac{E_g}{2k_BT}}}}$$
and the number of conduction electrons in a semiconductor conduction band is
$$\large n_{\text{...
- 4,607
0
votes
1
answer
180
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If we inject charge carriers into insulators, will they become conductors?
Since there're also valance band and empty band in insulators, if we introduce electrons in empty band or holes in valance band, will it conduct electric current like semiconductors?
For example, we ...
- 383
2
votes
0
answers
176
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Van der pauw method for an isolated hole
Van der pauw method is a way to measure the resistivity of a material with arbitrary shape while it meets some specifications ( being homogeneous and ...).
One of the conditions is that the sample ...
- 322
1
vote
1
answer
215
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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 ...
0
votes
1
answer
496
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Quasi-fermi levels in a solar cell?
I was wondering, if my fermi levels splits up due to n and p type doping into two fermi levels, one for the p type one for the n type, and now due to light radiation my fermi levels split up into 2 ...
user85397
3
votes
1
answer
3k
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Do batteries provide electrons
In chemistry, the reaction at negative electrode produces electrons,which flow to the positive electrode through the circuit. But then, if circuit has a conductor, then wouldn't it also release ...
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