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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Temperature-Dependent Approach to Electronic Charge Transfer.

Marco Franco-Pérez1, José L Gázquez2, Paul W Ayers3

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A new charge transfer model reveals that fractional charges indicate electron transfer between chemical species. This model provides chemically meaningful insights, even for small charge values, correlating with experimental data.

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Area of Science:

  • Theoretical Chemistry
  • Quantum Chemistry
  • Chemical Physics

Background:

  • Chemical interactions involve charge transfer between species.
  • Understanding fractional charge is key to modeling these interactions.
  • Previous models lacked a comprehensive framework for analyzing charge transfer dynamics.

Purpose of the Study:

  • Develop a charge transfer model within the grand canonical ensemble.
  • Analyze fractional charge behavior as a function of chemical potential.
  • Identify conditions leading to non-zero fractional charges and interpret their chemical significance.

Main Methods:

  • Utilized the grand canonical ensemble framework.
  • Analyzed fractional charge as a function of bath chemical potential.
  • Fixed temperature and external chemical potential during analysis.
  • Investigated two scenarios: one species in a bath of another, and stoichiometric mixtures.

Main Results:

  • Fractional charges become non-zero after interaction, indicating charge transference.
  • Two key situations identified: species in a bath and stoichiometric proportions.
  • Correlations found between fractional charges, average energies, and experimental data (equilibrium constants, rate constants, etc.).
  • Stoichiometric case shows good correlation between equalized and experimental chemical potentials for small molecules.

Conclusions:

  • The developed charge transfer model provides chemically meaningful information.
  • Fractional charges, though small, are significant indicators of charge transfer.
  • The model shows promise for predicting molecular properties and understanding chemical reactions.