Understanding Transistors: A Look into the Physics Behind their Functionality

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Discussion Overview

The discussion revolves around understanding the fundamental physics behind how transistors operate, particularly focusing on the mechanisms that prevent current flow between the base and collector in pnp transistors. Participants seek deeper insights into the principles governing transistor functionality and the implications of component interchangeability.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant expresses a desire to understand the fundamental physics of transistors, specifically why there is no current flow between the base and collector in pnp transistors.
  • Another participant provides a link that may contain relevant information about transistor functionality.
  • A participant questions whether the emitter and collector, being identical junctions, can be interchanged in a transistor.
  • It is noted that while theoretically the transistor could work if the emitter and collector were reversed, there would be significant performance limitations, including a drop in alpha and beta values.

Areas of Agreement / Disagreement

Participants generally agree on the theoretical possibility of interchanging the emitter and collector but acknowledge that this would lead to performance issues. The discussion remains open regarding the deeper physics behind transistor operation.

Contextual Notes

Participants have not fully explored the underlying assumptions about doping levels and their impact on transistor performance, nor have they resolved the fundamental physics questions posed by the initial participant.

The_Thinker
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Hey... I really want to know the root means. I mean i know how a transistor works as in how it functions... But I don't know how it works that way, I want to know the "physics" meaning... as in why it works that for all the various transistors and other components. If someone has a link as to where i can get such info... It would be very helpfull... I want to know how it works.. as in why there is no flow of current between the base and collector in a pnp transistor... At the fundamental level...

Anyone want to help me out? I would be very greatfull..:smile:
 
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thx for the reply man... :smile: I've just got one question though... since the emitter and collector are identical junctions, can they be interchanged? or must an emitter necessarily be used only as the emitter junction...
 
The_Thinker said:
thx for the reply man... :smile: I've just got one question though... since the emitter and collector are identical junctions, can they be interchanged? or must an emitter necessarily be used only as the emitter junction...

Collector and emitter are doped in different proportions for optimum performance. If you reverse them, the transistor would still work theoretically but with severe limitations. The alpha would drop by more than half, and beta less than one.
 
cool... that's what i thought would happen too, thanks for reconfirming it to me... :smile:
 

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