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Related Concept Videos

Carrier Transport01:21

Carrier Transport

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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The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Band Theory02:35

Band Theory

When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Valence Bond Theory02:42

Valence Bond Theory

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Theory of Metallic Conduction01:17

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Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
Debye–Huckel–Onsager Conductance Equation01:28

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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Theory for spin diffusion in disordered organic semiconductors.

P A Bobbert1, W Wagemans, F W A van Oost

  • 1Department of Applied Physics, Technische Universiteit Eindhoven, 5600 MB Eindhoven, The Netherlands.

Physical Review Letters
|June 13, 2009
PubMed
Summary

We developed a theory for spin diffusion in organic semiconductors, predicting weak temperature and strong magnetic field dependence for spin diffusion length. This aligns with experimental findings in organic spin valves.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Organic Electronics

Background:

  • Spin diffusion is crucial for spintronic devices.
  • Understanding spin transport in disordered organic semiconductors is challenging.
  • Existing theories often fail to capture the complex interplay of factors influencing spin diffusion.

Purpose of the Study:

  • To develop a comprehensive theory for spin diffusion in disordered organic semiconductors.
  • To investigate the influence of hyperfine fields and external magnetic fields on spin diffusion.
  • To provide a theoretical framework that explains experimental observations in organic spin valves.

Main Methods:

  • Developed a theory combining incoherent charge carrier hopping and coherent spin precession.
  • Utilized Monte Carlo simulations to model spin diffusion dynamics.
  • Analyzed the waiting-time distribution of charge carriers.

Main Results:

  • Predicted a weak temperature dependence of the spin-diffusion length.
  • Predicted a significant magnetic-field dependence of the spin-diffusion length.
  • Demonstrated agreement between theoretical predictions and experimental data from organic spin valves.

Conclusions:

  • The proposed theory accurately describes spin diffusion in disordered organic semiconductors.
  • Hyperfine fields and applied magnetic fields play critical roles in determining spin diffusion length.
  • The findings offer insights for designing and optimizing organic spintronic devices.