Elementary electronics and semiconductors

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SUMMARY

This discussion focuses on elementary electronics and semiconductors, specifically addressing intrinsic carrier density in silicon at 300K, which is 10^10/cm^3. Participants clarify the distinction between free electrons, holes, and valence electrons, emphasizing that while free electrons and holes are equal in undoped silicon, valence electrons are not the same as free electrons. The conversation also highlights the need to reference material constants to determine the number of atoms in silicon.

PREREQUISITES
  • Understanding of intrinsic carrier density in semiconductors
  • Knowledge of silicon properties at 300K
  • Familiarity with the concepts of free electrons and holes
  • Basic grasp of valence electrons in semiconductor materials
NEXT STEPS
  • Research the calculation of intrinsic carrier density in different semiconductors
  • Learn about doping effects on semiconductor properties
  • Study the relationship between free electrons, holes, and valence electrons
  • Investigate material constants for silicon and their applications in electronics
USEFUL FOR

Students studying electronics, semiconductor physicists, and engineers involved in semiconductor device design and analysis.

bonildo
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Homework Statement


http://postimg.org/image/hf6zpmykr/

Homework Equations


intrinsic carrier density = ni = 10^10/cm^3 (for Si at 300K)

The Attempt at a Solution


Its a really elementary problem but I can't figure out the difference between some quantities. For example, free electrons and holes would be in same quantity since the bar isn't dopped? Valence electrons and free electrons are the same thing ? And I can't see a way to calculate the numbers of atoms.
 
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bonildo said:
For example, free electrons and holes would be in same quantity since the bar isn't dopped?
Right. And you have an equation that allows to find the product of those two numbers.

bonildo said:
Valence electrons and free electrons are the same thing ?
No.

How many valence electrons per silicon atom do you have?
The number of atoms is independent of the semiconductor properties, but you'll have to look up material constants for silicon.
 

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