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Does the hole injection take place from p semiconductor to n semiconductor in a pn junction diode? Or it takes place only in the case of a transistor?

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  • \$\begingroup\$ Yes. Hole injection from p to n happens in forward biased pn-junction. Which applies to diode and transistor. \$\endgroup\$
    – nidhin
    Commented Oct 19, 2018 at 14:48
  • \$\begingroup\$ Holes injection create a more positive charge, which gives rise to amplification.. Does this happen in case of diode?? \$\endgroup\$ Commented Oct 19, 2018 at 14:49
  • \$\begingroup\$ It's part of the reason (or all -- I can't remember the details) why a diode has a non-zero reverse recovery time. The depletion zone gets filled with carriers, and it takes time to clear them out. \$\endgroup\$
    – TimWescott
    Commented Oct 19, 2018 at 14:50
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    \$\begingroup\$ I think you might be misunderstanding the source of amplification. Ordinary diodes do not amplify signals on their own, no. \$\endgroup\$
    – Hearth
    Commented Oct 19, 2018 at 15:04

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