Chemistry Question

Serendipity
Serendipity Posts: 6,975
edited April 2011 in The Clubhouse
I have some homework due next Tuesday, and not remembering *anything* from high school chemistry, was wondering if any chemists here could explain the following to me:

The Donor concentration in Si crystal is 1017cm-3. Assume complete ionization. Temperature is 300K. At the moment t=0 the 1016cm-3 of excess electrons and holes were generated. Find the position of the electron quasi-Fermi energy with respect to conduction band edge. Find the position of the hole quasi-Fermi energy with respect to valence band edge. Compare to the position of the Fermi energy in equilibrium (before generation of the excess carriers).

I just want to let everyone know that I am NOT looking for just the answer, as it is useless when it comes time for the exam, but would rather know how to solve the problem. I'd GREATLY appreciate it if anyone could give me ANY advice on these, and will say thanks in advance.

- Serendipity
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  • Systems
    Systems Posts: 14,873
    edited February 2011
    I like cake.:biggrin:
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  • nooshinjohn
    nooshinjohn Posts: 25,392
    edited February 2011
    I find that my two channel rig helps me solve problems just like this one. Have you tried that yet?
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  • gdb
    gdb Posts: 6,012
    edited February 2011
    The crux of the biscuit is the apostrophe :biggrin: Does that help any?
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  • steveinaz
    steveinaz Posts: 19,538
    edited February 2011
    Select "E" One of the above.
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  • decal
    decal Posts: 3,205
    edited February 2011
    The heat of the meat is directly proportional to the angle of the dangle,or something like that !!!!!!
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  • billbillw
    billbillw Posts: 6,741
    edited February 2011
    Always amazes me that people come here for academic advice. Kid, read your book, read your notes, and work out the problem. That's the way we all did it back before the internet. BTW, I don't think any High School chemistry would help you in that problem.
    For rig details, see my profile. Nothing here anymore...
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  • joeparaski
    joeparaski Posts: 1,865
    edited February 2011
    I think I got a headache just reading that.

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  • Systems
    Systems Posts: 14,873
    edited February 2011
    billbillw wrote: »
    Always amazes me that people come here for academic advice. Kid, read your book, read your notes, and work out the problem. That's the way we all did it back before the internet. BTW, I don't think any High School chemistry would help you in that problem.

    Word! :biggrin:
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  • AudioGenics
    AudioGenics Posts: 2,567
    edited February 2011
    this will get you going..... good luck on the exam

    fc(k,r) conduction-band state

    fv(k,r) valence-band state

    ni(Tn) thermal equilibrium if Fermi level at Ei & temp Tn
    pi(Tp) thermal equilibrium if Fermi level at Ei & temp Tp
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  • Serendipity
    Serendipity Posts: 6,975
    edited April 2011
    AudioGenics wrote: »
    this will get you going..... good luck on the exam

    fc(k,r) conduction-band state

    fv(k,r) valence-band state

    ni(Tn) thermal equilibrium if Fermi level at Ei & temp Tn
    pi(Tp) thermal equilibrium if Fermi level at Ei & temp Tp

    Ok, I got this assignment back and apparently answered the question wrong. I guess it's not a simple "substitute and solve" kind of question I was hoping for...
    polkaudio RT35 Bookshelves
    polkaudio 255c-RT Inwalls
    polkaudio DSWPro550WI
    polkaudio XRT12 XM Tuner
    polkaudio RM6750 5.1

    Front projection, 2 channel, car audio... life is good!
    · Share on FacebookShare on Twitter
  • gdb
    gdb Posts: 6,012
    edited April 2011
    Does this mean you'll be attending summer school ?:biggrin:
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  • Airplay355
    Airplay355 Posts: 4,298
    edited April 2011
    What the hell is that? Must be inorganic chemistry...

    I like biochemistry and maybe even organic chemistry, but I hate inorganic.
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  • Systems
    Systems Posts: 14,873
    edited April 2011
    Its a very complicated cake recipe.:biggrin:
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  • cincycat13
    cincycat13 Posts: 882
    edited April 2011
    It actually looks more like a solid state circuit status calculation.
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  • ESavinon
    ESavinon Posts: 3,066
    edited April 2011
    The answer is: C.
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