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

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In summary, the conversation is about the difference in mechanisms of IB1 and IB2 formation in a BJT transistor. The first person is asking for clarification on the base current and the second person is explaining that both IB1 and IB2 involve holes in the base moving to the emitter and recombining with electrons. The difference lies in the direction of the movement of these particles. The first person also questions whether the recombining electrons in the emitter are valence electrons or free electrons."
  • #1
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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  • #2
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?
 

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  • #3
Hi, can anyone help?
 
  • #4
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.
 

1. What is the main difference between the mechanisms of IB1 and IB2 formation?

The main difference between IB1 and IB2 formation lies in the level of ionization involved. IB1 (Intermediate Bond 1) is formed through the transfer of one electron between two atoms, while IB2 (Intermediate Bond 2) is formed through the transfer of two electrons.

2. How does the level of ionization affect the stability of IB1 and IB2?

IB1 is less stable than IB2 because it involves the transfer of only one electron, leaving one atom with a partially filled valence shell. IB2, on the other hand, involves the transfer of two electrons, resulting in a more stable filled valence shell for both atoms.

3. Are the mechanisms of IB1 and IB2 formation affected by the types of atoms involved?

Yes, the types of atoms involved can affect the mechanisms of IB1 and IB2 formation. For example, IB1 is more commonly observed in compounds involving transition metals, while IB2 is more commonly observed in compounds involving main group elements.

4. How do the bond strengths of IB1 and IB2 compare to traditional covalent and ionic bonds?

The bond strengths of IB1 and IB2 are generally weaker than traditional covalent and ionic bonds. IB1 is typically stronger than IB2 due to the smaller size of the ion involved, while IB2 is weaker due to the larger size of the ion involved.

5. Can IB1 and IB2 be classified as completely ionic or completely covalent bonds?

No, IB1 and IB2 cannot be classified as completely ionic or completely covalent bonds. They are considered to be intermediate bonds, sharing characteristics of both ionic and covalent bonds.

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