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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Charge Transfer between Quantum Dots and Redox Molecules Is Not Auger-Assisted.

Yan B Vogel1, Willemijn Boeije1, Lotte van Steekelenburg1

  • 1Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, Delft 2629 HZ, The Netherlands.

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|January 15, 2026
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Summary
This summary is machine-generated.

The Marcus inverted region, crucial for understanding charge transfer, is not observed in quantum dots (QDs). This study refutes the Auger hypothesis, showing charge transfer rates increase with free energy difference in QDs.

Keywords:
Marcus theorycharge transferelectron transferhole transfermolecular acceptornanocrystalquantum dot

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Marcus theory is the standard for molecular charge transfer, predicting an inverted region.
  • This inverted region, where transfer rates decrease with increasing free energy, has not been observed in quantum dots (QDs).
  • The Auger hypothesis proposed Auger-assisted charge transfer as the reason for the absence of the Marcus inverted region in QDs.

Purpose of the Study:

  • To experimentally test the validity of the Auger hypothesis in quantum dot systems.
  • To investigate charge transfer dynamics between PbS QDs and ferrocene derivatives.
  • To determine if charge transfer rates in QDs follow Marcus theory predictions.

Main Methods:

  • Ultrafast transient absorption spectroscopy was employed.
  • Rate constants for charge separation and recombination were measured.
  • Experiments involved PbS QDs functionalized with ferrocene derivative ligands.

Main Results:

  • Charge transfer rate constants increased with increasing free energy difference for both charge separation and recombination.
  • The observed rates were temperature-independent.
  • Transfer rates increased with the number of molecular acceptors on the QD surface.

Conclusions:

  • The experimental results contradict the predictions of the Auger-assisted charge transfer pathway.
  • The absence of the Marcus inverted region in QDs is not explained by the Auger hypothesis.
  • Quantum dot charge transfer dynamics may require alternative theoretical frameworks beyond the Auger hypothesis.