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- Thread starter shaikss
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And what "electric field"?

Zz.

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Zapper,

And what "electric field"?

Zz.

I know the energy band diagram of intrinsic semiconductor where Fermi energy level lies in the middle of conduction band and valence band. If we consider that characterstics, its the graph which is plotted w.r.t energy.

What I have asked is to sketch the energy band diagram of intrinsic semiconductor which includes fermi level with uniform electric field verses distance.

I googled but I didn't found the relevant sketch.

Thanks!

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I can only guess at what you are asking, because you are still not explaining it clearly.Zapper,

I know the energy band diagram of intrinsic semiconductor where Fermi energy level lies in the middle of conduction band and valence band. If we consider that characterstics, its the graph which is plotted w.r.t energy.

What I have asked is to sketch the energy band diagram of intrinsic semiconductor which includes fermi level with uniform electric field verses distance.

I googled but I didn't found the relevant sketch.

Thanks!

Are you asking for the situation where a perpendicular electric field is applied to the surface of the semiconductor, and you want the effect on the semiconductor bands due to this external field from the surface and into the bulk of the material?

If it is, then you should be searching for "bend bending" diagram.

Zz.

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please clarify me with respect to your second question.I can only guess at what you are asking, because you are still not explaining it clearly.

Are you asking for the situation where a perpendicular electric field is applied to the surface of the semiconductor, and you want the effect on the semiconductor bands due to this external field from the surface and into the bulk of the material?

If it is, then you should be searching for "bend bending" diagram.

Zz.

The question i have posed was asked in an iit interview.

But i still do not find the answer

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This is getting sillier. Now it is *I* who have to clarify what I thought you were asking?please clarify me with respect to your second question.

The question i have posed was asked in an iit interview.

But i still do not find the answer

1. Uniform E-field. I assume you know what that means.

2. Surface of semiconductor is perpendicular to this uniform E-field. Again, I assume you know what this is.

3. E-field affects the bands in the semiconductor. OK so far?

4. Is this what you are asking?

I think if I don't get a definite answer to what you are asking after this, I'm done.

Zz.

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Sketch the energy band diagram (E versus x) including Fermi level of an intrinsic semiconductor under uniform electric field in x-direction.

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Why the slope of -qE is required?

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Because the Energy of the bands is equal to [itex]qV+Const.[/itex]. So, the conduction band for example is [itex]E_c=qV+Const.=-q\int_0^x E_{field} dx'+Const.=-qE_{field}x+Const.[/itex] for a constant electric field, which I have denoted by [itex]E_{field}[/itex]. The Valence band is just taken by [itex]E_v=E_c-E_g=-qE_{field}x -E_g+Const.[/itex] where [itex]E_g[/itex] is just the bandgap energy. So the slope of the bands is [itex]-qE_{field}[/itex]Why the slope of -qE is required?

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