PNP Biploar Junction Transistor Energy Band Diagram

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SUMMARY

The discussion focuses on sketching the energy band diagram of a PNP Bipolar Junction Transistor (BJT) under three conditions: thermal equilibrium, active region biasing, and cutoff (depletion) region biasing. The user successfully sketched the first two diagrams but sought assistance for the cutoff region, which is not commonly found in textbooks. A helpful resource was shared, specifically a PDF from the University of Minnesota that includes relevant diagrams. The ASCII representation provided illustrates the basic structure of the energy band diagram.

PREREQUISITES
  • Understanding of PNP Bipolar Junction Transistor operation
  • Knowledge of semiconductor physics
  • Familiarity with energy band diagrams
  • Basic concepts of thermal equilibrium and biasing in transistors
NEXT STEPS
  • Study the energy band diagrams of NPN Bipolar Junction Transistors for comparison
  • Learn about the effects of temperature on semiconductor behavior
  • Explore the concept of depletion regions in detail
  • Investigate the role of doping concentrations in transistor performance
USEFUL FOR

Electrical engineering students, semiconductor device researchers, and anyone studying the operational principles of Bipolar Junction Transistors will benefit from this discussion.

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Homework Statement


Consider a PNP Biploar Junction Transistor uniformly doped in each region. Sketch the energy ban ddiagram for the case when the transistor is biased in

a)In thermal equilibrium
b)biased in the active region
c)biased in the cutoff (depletion) region


Homework Equations


None, this is a problem asked to sketch (To an approximate scale) the energy band diagram.


The Attempt at a Solution



I've sketched the first two, but neither my book or the notes contained an example of a PNP Bipolar Junction Transistor's energy band diagram at a cutoff region. can anyone show me a site or include a diagram of this?
 
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I registered here specifically because I wanted an answer to this and couldn't find it--until I stumbled on http://www.ece.umn.edu/academics/students/graduate/documents/prelims/Fall_2006/Fall%202006%20-%20Semiconductor%20Devices.pdf PDF. For anyone else who googles this question and comes across this answer--you're welcome.

Backups in case PDF goes down: imgur tinypic postimage pasteboard

Text description: it's a mirror image of the PNP active diagram. There's a small hill at first and then a steep drop until it levels off.

ASCII representation (imagine @ as spaces):

@ -
- @@-
@@@ -
@@@@ - - - -
 
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