Connect with us

stuck between the problem

Discussion in 'Electronics Homework Help' started by bhuvanesh, Jan 21, 2015.

Scroll to continue with content
  1. bhuvanesh

    bhuvanesh

    201
    0
    Aug 29, 2013
    question : find intrinsic carrier concentration at T=200k for silicon (in cm^-3).
    Answer is attached.In that why is that (200/300)^3 is added there.my only hope is this forum.Thank you
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,765
    1,920
    Sep 5, 2009
    there is no attachment
     
  3. bhuvanesh

    bhuvanesh

    201
    0
    Aug 29, 2013
    sorry,i have attached now
     
  4. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    Are you seriously trying to teach yourself semiconductor physics?
    Adam
     
    bhuvanesh likes this.
  5. Ratch

    Ratch

    1,092
    334
    Mar 10, 2013
    Nc and Nv have temperature parameters that are raised to the 3/2 power. If the temperature ratios are moved outside the exponent brackets, then the temperature ratios have to be raised to the third power to compensate for the move.

    Ratch
     
    bhuvanesh and Arouse1973 like this.
  6. bhuvanesh

    bhuvanesh

    201
    0
    Aug 29, 2013
    Why we need to move temperature outside the exponential.i have solved this in my way say weather it is right or wrong with explanation .Thank you
     

    Attached Files:

  7. Ratch

    Ratch

    1,092
    334
    Mar 10, 2013
    Nv and Nc have their temperature parameters inside a term raised to the 3/2 power. You don't need to take those temperatures outside the radical, but if you do, you have to compensate for their removal. The solution seems to have elected to move the temperature parameter to the outside the radical. Therefore, the temperature term has to be raised to the third power to compensate for the movement.

    Ratch
     
    bhuvanesh likes this.
  8. bhuvanesh

    bhuvanesh

    201
    0
    Aug 29, 2013
    sire i dont understand what do you saying here ,where it is raised to 3/2.its raised to power 3.
     
  9. Ratch

    Ratch

    1,092
    334
    Mar 10, 2013
    What book are you using? Doesn't it have the formula shown in the attachment? When Nv and Nc are multiplied together, the "2" in the denominator is cancelled and "3" remains.

    Ratch IMG_1128.JPG
     
    bhuvanesh and Arouse1973 like this.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-