All Questions
7
questions
1
vote
1
answer
67
views
Limit of applicability of "quasistatic"/capacitive picture of devices
When analyzing the transitories associated with switching in semiconductor devices, in textbook treatments one often sees the time dependence considered by including (potentially nonlinear) capacitors ...
- 1,161
1
vote
1
answer
100
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Confusion about why pn junction discussion insensitive to doping variations faster than Debye length
Sze (Physics of Semiconductor Devices, 3e) gives the following discussion which relates to how equilibrium electric fields/equilibrium potential build-up at thermal equilibrium are related to doping ...
- 1,161
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
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
0
votes
1
answer
800
views
Given a energy band diagram, can you always calculate potential, electric field, and charge distribution?
Given a band diagram, where do you start to get the electric field and charge distribution?
- 447
1
vote
2
answers
7k
views
Does doping always increase the conductivity of a semiconductor?
The conductivity of a semiconductor is given as (if extrinsic):
\$\sigma = qnu_e + qpu_h\$
where \$\sigma\$ is the conductivity, \$u_e\$ and \$u_h\$ are the electron and hole mobilities.
But does ...
- 45
0
votes
3
answers
3k
views
Electron concentration in an intrinsic semiconductor at room temperature
For a Si atom, band gap energy is around 1.1 eV which means that an electron in valence band needs at least this much energy to jump to conduction band.
Also, at room temperature, typically energy of ...
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