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electron and hole mass

Discussion in 'Electronic Basics' started by Sunil, Feb 11, 2007.

  1. Sunil

    Sunil Guest

    how can we consider electron and hole masses as different??how are
    they equal??isnt a hole supposed to be imaginary??
     
  2. No, holes are real. Just as in a waiting line where sometimes "holes" form
    for various reasons when electrons move they can leave "holes" of positive
    charge(absence of electrons) that do exist. I don't like the use of the word
    hole as it can easily be misinterpreted and actually somewhat hides the true
    nature that is more confusion but should be understood.

    These holes have mass in the sense of negative mass. That is, what mass
    would it take to "fill up" the hole.

    In a waiting line the gaps move always towards the back and the people
    always move towards the front. If there is a gap that is formed then it
    might look like it is moving forward but if you just look at the fixed
    position of the gap and it will get filled by a person(but as that happens
    there is a gap formed in front of them by the person in front of them moving
    at the same time). We could ask what is the "mass" of a gap and it would be
    the number of people that could fit in the gap.

    For a np junction you can ignore the concept of holes but it does require a
    little more thought. Since holes moving in one direction are equivilent to
    electrons moving in the opposite direction you can use either concept. The
    first one tends to be easier for most.

    Jon
     
  3. Sunil

    Sunil Guest

    \thanx a lot
     
  4. This might be some help:
    http://en.wikipedia.org/wiki/Effective_mass
     
  5. jasen

    jasen Guest

    Mass is a measure of innertia, holes have innertia.

    Bye.
    Jasen
     
  6. Hole theory is as valid as electron theory. When an electron moves it
    leave a hole. Holes flow in opposite directions.
     
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