How Does Entropy Influence Electron-Hole Recombination Mechanisms?

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Discussion Overview

The discussion revolves around the mechanisms of electron-hole recombination and the role of entropy in this process. Participants explore the conditions under which free electrons return to holes and the implications of energy states and entropy in this context.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions why a free electron would recombine with a hole if it possesses more energy than the valence band, suggesting a need for clarification on the recombination process.
  • Another participant asserts that systems tend to seek lower energy states when available, implying this drives the recombination process.
  • A request for mathematical or physical proof of the recombination phenomena is made, indicating a desire for a deeper understanding of the underlying principles.
  • One participant proposes that the process is related to entropy maximization, suggesting that energy distribution among photon states increases entropy, which may influence recombination dynamics.

Areas of Agreement / Disagreement

Participants express differing views on the mechanisms of recombination and the role of energy states and entropy, indicating that multiple competing perspectives remain without consensus.

Contextual Notes

Limitations include the need for further clarification on the assumptions regarding energy states and the mathematical framework supporting the claims about entropy and recombination.

Who May Find This Useful

Researchers and students interested in semiconductor physics, quantum mechanics, and thermodynamics may find this discussion relevant.

Goodver
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I understand that electron-hole produced when certain energy in form of a photons applied to atom that electron can escape.

But, why would free electron fall back to the hole if it has more energy than energy on valence band? How recombination happens? Or it is because it collides with other electrons in this atom, than why don't they escape then?

thanks
 
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Everything seeks the lower energy state - if one is available.
 
Thanks Simon. Is there a mathematical or physical proof of this phenomena?
 
It is all a question of entropy maximization. The energy will finally get distributed over a continuum of photon states due to the coupling of electric dipole moment to the electric field. The large number of photon states have a higher entropy.
 

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