Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion
Discussion Forum : Electronic Devices and Circuits - Section 1 (Q.No. 14)
14.
In a p type material the Fermi level is 0.3 eV above valence band. The concentration of acceptor atoms is increased. The new position of Fermi level is likely to be
Answer: Option
Explanation:
Addition of acceptor atom brings Fermi level closer to valence band.
Discussion:
12 comments Page 1 of 2.
Tapan said:
1 decade ago
According to you the Fermi level should be closer to the valence band but how 0.28 is closer than 0.1 level.
(1)
VSMULEY said:
7 years ago
The question asks the Fermi level LIKELY TO BE(most possible answer).
So even if the acceptor atoms concentration is increased and it reaches 0.1EV, it must first reach 0.28eV.
So if the concentration is increased, then Fermi level will reach 0.28eV and is the most possible answer.
So even if the acceptor atoms concentration is increased and it reaches 0.1EV, it must first reach 0.28eV.
So if the concentration is increased, then Fermi level will reach 0.28eV and is the most possible answer.
(1)
Nikesh Ranjan said:
1 decade ago
How 0.28eV has been calculated?
Rdx said:
1 decade ago
Its nearest of 0.3ev.
Nasrullah said:
10 years ago
Can any body define fermi level?
Nikhil said:
9 years ago
Ef - Ep = 0.3.
When the concentration of acceptor atoms increases then Ef - Ep becomes less (nearer to valence band).
When the concentration of acceptor atoms increases then Ef - Ep becomes less (nearer to valence band).
Murali dadi said:
8 years ago
@Nasrullah.
Fermi level is the top of all energy states up to which electrons are filled.
Fermi level is the top of all energy states up to which electrons are filled.
Dolon said:
8 years ago
But it can be 0.1 eV also.
Exact 0.28eV can't be calculated. Then how this answer comes?
Exact 0.28eV can't be calculated. Then how this answer comes?
Anisha said:
8 years ago
Please anyone can give an exact solution.
Abhijit said:
8 years ago
See where will be the position of the Fermi level after increasing doping we can't say exactly but as much as we dopped the Fermi level will be more near to valence band, if we still increase the impurity up to significant level there will be a time when the Fermi level starts entering the valence band (known as degenerated semiconductor, used in tunnel diode).
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