Understanding Transistors: A Look into the Physics Behind their Functionality

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The discussion focuses on understanding the fundamental physics behind how transistors operate, particularly the behavior of current flow in pnp transistors. The user seeks resources to comprehend why current does not flow between the base and collector. A link to educational material is provided, which offers insights into the topic. It is clarified that while the emitter and collector in a transistor are identical junctions, they cannot be interchanged due to their different doping levels, which are crucial for optimal performance. Reversing them would lead to significant performance degradation, affecting key parameters like alpha and beta.
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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