Recent content by Red

I just found out that it is very easy! Because of the high surface state density, band bending is simply half of Eg, 0.55eV. Now We can use the second equation in ' Relevant equations' to determine the depletion depth d. And then we can find density of occupied surface states, NDd. And there we...

Homework Statement Consider an n-type Si (Eg =1.1eV, ED=EC, εr=11.8) with a bulk doping density ND=1×1017cm-3, a density of acceptor type surface state 1×1014 cm-2 and these states are at the middle of the band gap. Evaluate the amount of: a) band bending b)depletion layer thickness c) density...

Yes it does, thank you!

Thank you guy very much! Thank you haruspex, Orodruin, ehild and the rest for your help!

Thank for all of your responses, I really appreciate them. I am quite confused now. I let the inner shell has a surface charge density of ρ and using Gauss Law I found the electric field between the shells. The electric field is E(r)=r12ρ/ε0r2. How should I continue to find the potential at r0...

Thank for your responses. I think there is an misunderstanding. Maybe I should ask the question in a slightly different way: A potential VH is applied between 2 spherical conducting shell. The inner sphere has radius r1, while the outer sphere has radius r2. What is the potential at the center...

How can we distinguish between Auger and core-level loss peaks (such as in XPS) in the secondary electron spectrum?

Hi ehild, thank you for your response, however the charge on the shells are not known. What is known is that the outer shell has potential V2 and the inner shell has potential V1. How do I find the potential at the center between these two shells?

I don't quite get you. If I sum up q1 and q2 then I get V0=(r1V1+r2V2)/r0.

Yes exactly, the potential at the outer shell is related to the charge that contribute to the inner shell. Haruspex how can I find the mean potential at the center of the two shells?

Sure. I let V1=-kq1/r1, V2=-kq2/r2. I made both q the subject and sum them up, q0=q1+q2=(-r1V1-r2V2)/k. Then I proceed to find the potential at center of both sphere, V0=-kq0/r0=(r1V1+r2V2)/r0.

Homework Statement Consider two concentric spherical conducting shell. The inner sphere has radius r1, potential V1, while the outer sphere has radius r2, potential V2. Find the potential at the center of these two sphere, at r0=(r1+r2)/2. 2. The attempt at a solution I tried to use method...

Thanks adjacent! I have just learn TeXstudio so I am kind of more familiar with this kind of text input now.

Thank you for your help!

Thank you for your help. Mathematica does help.