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Why does the LED structure favorizes p-type semiconductor?

  1. Nov 26, 2011 #1
    Why does the LED structure "favorizes" p-type semiconductor?

    Hi all,

    At first I apologize if my English makes this post harder to understand ;).

    I am trying to figure out why there is always P-type semiconductor flashing outside in LEDs, both planar and edge ones - P-type region is the active region, why not N-type sometimes?
    Radiative recombination occurs within the area that overlaps both semiconductors - why then p-type is better to be exposed?

    I am thinking if it has something to do with direct/indirect band gap or maybe quantum efficiency of p/n semiconductors - but if there is any n-type semiconductor with direct band gap then I'm wrong.

  2. jcsd
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