What is the difference in mechanisms in which IB1 and IB2 are formed?

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Discussion Overview

The discussion focuses on the mechanisms of formation for IB1 and IB2 in bipolar junction transistors (BJTs), specifically regarding the behavior of charge carriers in the base and emitter regions. Participants seek clarification on the role of valence and free electrons in these processes.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant asks for help distinguishing the mechanisms of IB1 and IB2 as depicted in a provided diagram.
  • Another participant expresses confusion about the base current in BJTs, specifically regarding the injection of holes from the base to the emitter and the nature of electrons that recombine with these holes.
  • A different participant describes the movement of holes from the base to the emitter as similar to the movement of electrons from the emitter recombining with holes in the base, questioning the differences between IB1 and IB2.

Areas of Agreement / Disagreement

Participants express confusion and seek clarification, indicating that there is no consensus on the differences between the mechanisms of IB1 and IB2.

Contextual Notes

Participants mention concepts such as valence electrons and free electrons, but the discussion lacks clarity on definitions and assumptions regarding these terms. There are unresolved questions about the nature of the charge carriers involved in the recombination process.

anhnha
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Hi,
Can anyone help me? What is the difference in mechanisms in which IB1 and IB2 are formed in the picture below?
attachment.php?attachmentid=61717&stc=1&d=1378970406.jpg

http://en.wikipedia.org/wiki/File:NPN_BJT_Basic_Operation_(Active).svg
Thanks.
 

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  • base current.JPG
    base current.JPG
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valence electrons or free electrons

Hi,
I am a bit confused about base current in BJT transistor. Please help.
Here is a picture from a lecture.
attachment.php?attachmentid=61732&stc=1&d=1379002791.jpg

I want to ask about iB1 (hole injection from B to E).
Holes in base are injected into emitter and then they recombined with electrons in emitter.
Are electrons in emitter that recombine with holes from base valence electrons?
If, for example, all electrons in emitter that recombine with holes from base are free electrons then
hole injected from B to E iEp will not exist, right?
 

Attachments

  • base current 1.JPG
    base current 1.JPG
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Hi, can anyone help?
 
iB1: holes in Base move from Base to Emitter
This is same as electrons from emitter, recombining with holes in Base to become valance electrons and they continue move to B.
iB2: electrons from emitters recombining with holes in Base and continue move to B
I don't see any difference. Please help.
 

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