Electric field between bands in semiconductors

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SUMMARY

The discussion centers on the electric field between the conduction band (E_c) and the valence band (E_v) in semiconductors, specifically addressing the formula for electric field strength, E = dE_c / q dx. Participants clarify that the conduction and valence bands represent different energy levels rather than spatially separated regions. The direction of the electric field is confirmed to be from the conduction band to the valence band, aligning with the movement of electrons and holes. Additionally, the concept of electron mobility (\mu_n) is briefly mentioned, indicating its relevance in semiconductor physics.

PREREQUISITES
  • Understanding of semiconductor physics and energy band theory
  • Familiarity with electric field equations, specifically E = dE_c / q dx
  • Knowledge of electron mobility (\mu_n) in semiconductors
  • Basic concepts of charge carriers, including electrons and holes
NEXT STEPS
  • Research the concept of energy bands in semiconductors, focusing on conduction and valence bands
  • Study the implications of electron mobility (\mu_n) on semiconductor performance
  • Explore the relationship between electric fields and charge carriers in semiconductor materials
  • Learn about the mathematical derivation and applications of electric field equations in semiconductor physics
USEFUL FOR

Students and professionals in electrical engineering, semiconductor physicists, and anyone interested in understanding the behavior of electric fields in semiconductor materials.

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i read in an online course about semiconductors that electric field between [tex]E_c[/tex] and [tex]E_v[/tex]
given by:

[tex]E=\frac{dE_c}{q dx}[/tex]

and i know the general form of electric field is :
[tex]E=\frac{k.q_0.q}{r^2}[/tex]
and what is the direction of this field ,i know from positive to negative , from [tex]E_c[/tex] to [tex]E_v[/tex]? because both [tex]E_c[/tex] & [tex]E_c[/tex] have electrons and holes

and dose anyone know what is [tex]\mu_n[/tex] electron mobilities

thank you very much!
 
Last edited:
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First off be careful with your notation. When using Electric Field and Energy you're best off not to use the symbol "E" for both. Consider using "E" for electric field and "W" for work or energy.

Second and more important, you seem to have a fundamental misunderstanding of the semiconductor energy band model. The conduction and valence bands represent different energy levels in the semiconductor, they are not spatially separated.
 
yes! I'm sorry you are right
could i have an electric field between negative charge and positive charge even if there isn't a space between them .
and is it correct that:
the direction of this field is,i know from positive to negative , from CB(conduction band) to VB ?
 

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