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Electronic Devices & CircuitsSemiconductor Fundamentals

Minority-carrier diffusion length L is related to diffusion coefficient D and carrier lifetime tau by?

  • AL=sqrt(D tau)
  • BL=D/tau
  • CL=D tau
  • DL=sqrt(D/tau)
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Correct Answer: A. L=sqrt(D tau)
Explanation: The characteristic diffusion length is L=sqrt(D tau), describing the average scale over which excess minority carriers diffuse before recombination.
Reference: Standard semiconductor electronics: diffusion length
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