Semiconductor type question...

Discussion in 'General Electronics Chat' started by goodbyegti, Nov 22, 2004.

  1. goodbyegti

    Thread Starter Well-Known Member

    Apr 28, 2004
    59
    0
    Hi peoples, i've had a read of this:

    http://ece-www.colorado.edu/~bart/book/

    which i noticed someone posted when i did a search but can't find the answer to my question..

    In a n-MOSFET you've got the p type substrate and the two n+ type semiconductor regions at the source and drain.

    Basically why are they n+ and not n type?

    Is is because electrons migrate out of the source and drain into the p type substrate?

    ;) im confused..

    many thanks for any help...
     
  2. goodbyegti

    Thread Starter Well-Known Member

    Apr 28, 2004
    59
    0
    i have been enlightened.... n+ region is just a heavily doped n type semiconductor region

    ..at least i think this is correct..
     
  3. fuzzy_logic

    Member

    Nov 7, 2004
    19
    0
    Yes, you are right. n+ region will give you the maximum electric potential, which is about 550mV if I'm not mistaken.
     
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