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Charge carrier injection in heterostructures - help with concept definition

  1. Dec 27, 2012 #1

    I have this report to do on "Charge injection in heterostructures". I have been searching and reading but I still have some trouble with the basics, i.e. defining the concept.

    As far as I understood a heterostructure is a junction between two or more different semiconductors and the carrier injections comes in the sense of bringing electrons and/or holes to the heterostructure through some kind of contact as a way of making a current or a light emitter by electron-hole recombination.

    So the first question, is this correct?

    What is difference between this and conduction through a metal-semiconductor contact? Is there such thing as a metal-heterostructure contact?

    Does electron-hole pair formation by light counts as charge injection?

    What is super-injection?

    Can you advise me with some bibliography about this topic?

    I'm really having trouble expanding this concept in details. Thanks for the help.
  2. jcsd
  3. Jan 18, 2013 #2
    A heterostructure is simply a structure where the bandgap changes from one side of the junction to the another. That's it.

    Carrier injection does not bring them to the heterostructure. It makes them cross the depletion region.

    metals dont have bandgaps. So it wont be heterostructure. There is no such thing as a metal-heterostructure contact.

    No. Its called carrier generation.

    I never heard super-injection before. However here is a paper which mentions it.
    http://www-5.unipv.it/eslw2010/ESLW_Portnoi abstract.pdf
    Try to find the paper in reference 4.
  4. Jan 18, 2013 #3
    Thank you!
    I was thinking it wrong.
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