All Questions
Tagged with semiconductors solid-state-devices
62
questions
7
votes
2
answers
72k
views
E-K diagram in case of semiconductors
I am currently studying solid state electronic devices and want to build my concept in this subject. Can anyone explain to me what is E-k Diagram and what is its significance?
5
votes
1
answer
416
views
Semiconductors: electrons more mobile than holes despite being heavier?
I apologize if this is a very basic question. But I have always known it to be true that in Silicon, electrons have higher mobility than holes. From my semiconductor physics classes in first year, the ...
- 393
5
votes
2
answers
6k
views
MOSFET Depletion Region Widening
I do understand why when drain voltage (\$V_D\$) increases, the channel carriers decrease (the channel narrows), specially near the drain island, eventually reaching pinch-off phase.
What I don't get ...
- 361
4
votes
2
answers
838
views
Why are drain and source not actually perfectly symmetric?
In textbook treatments, one has that the source and drain of a MOSFET are completely symmetrical and therefore interchangeable -- the distinction is only made by which is at a higher voltage in the ...
- 1,161
4
votes
1
answer
2k
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Modelling and simulating multiple-collector/emitter BJTs
I occasionally like to try to understand how well-known integrated circuits work by building them up in a simulator and observing how they respond to changing conditions. However, I keep coming across ...
- 35.2k
4
votes
3
answers
659
views
Potential distribution in MOSFET
Let us assume that an NMOSFET has its source, drain and substrate grounded therefore VDS and VSB=0 V . We apply a gate voltage VGS=2 V and I want to know how this potential is distributed as we move ...
- 49
3
votes
1
answer
694
views
Why is Junction Temperature called so?
Why is the silicon die temperature inside a semiconductor device referred to as "Junction" Temperature ?
Though this name may make sense for minority carrier devices where there is maximum power ...
- 249
3
votes
1
answer
2k
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Why does the MOSFET drain current increase abruptly when Gate voltage is greater than the threshold voltage?
As far I've understood, channel formation takes place because of the induced negative charge on the semiconductor side of the gate capacitance. So shouldn't the charge concentration increase linearly ...
- 187
3
votes
1
answer
270
views
What is equilibrium carrier concentration in a semiconductor? Is it material specific? How to calculate it?
Is equilibrium carrier concentration dependent on doping density? If it is, then how to know how much the doping density should be for a particular semiconductor device?
- 47
3
votes
0
answers
135
views
High frequency switching applications
I was reading that for high frequency switching applications with
semiconductors, the ratio of the electron to hole mobility should be high.
Why is it so? Is it a necessary condition always? Or ...
- 171
3
votes
1
answer
221
views
Why do PMOS suffer a worse body effect than NMOS?
Gray, Hurst, Lewis, and Meyer give the following discussion around PMOS transistors which I followed except for the sentence which reads:
Good use can be made of this fact in analog circuits to ...
- 1,161
2
votes
1
answer
851
views
Difference between Vth and Vge?
What is the difference between the threshold voltage (Vth) and gate-emitter voltage (Vge) for IGBT devices?
How can I calculate Vth of an IGBT chip?
- 21
2
votes
1
answer
605
views
Confusing regarding measuring barrier potential of a pn junction using a voltmeter
I have been trying to understand why we can't measure the Barrier potential existing in an unbiased pn diode but on seeing the answers I am quite confused.
There seems to be two answers to this ...
- 469
2
votes
1
answer
701
views
Do the recombination of charge carriers cause the diode to stop conducting?
This might be a stupid question but I am either having a mental block or I'm getting something. I'm learning about excess minority charge carriers.
So, when an electric field is applied across a pn ...
- 1,831
2
votes
2
answers
1k
views
Why does the majority carrier concentration near the junction not decrease under forward bias? (PN junction)
We see that the current due to the majority carrier decreases near the junction as shown above, which means the majority carrier concentration should also decrease since the diffusion current is given ...
- 447