Ab Initio Analysis of Auger-Assisted Electron Transfer

Area of Science:

• Physical Chemistry
• Materials Science
• Quantum Mechanics

Background:

• Quantum confinement in nanomaterials enables electron-hole energy exchange via Auger-type processes.
• Understanding charge transfer (CT) mechanisms is crucial for nanoscale electronic and optoelectronic applications.

Purpose of the Study:

• To investigate a novel charge transfer mechanism driven by Auger processes in nanoscale systems.
• To theoretically and computationally explain experimental observations of CT from quantum dots to molecular adsorbates.

Main Methods:

• Direct time-domain atomistic simulations were employed to model the dynamics.
• Analytic theory and ab initio simulations were developed to describe Auger-assisted CT.
• Comparison with experimental data, particularly the CT rate plateau.

Main Results:

• Auger processes facilitate a new nanoscale charge transfer mechanism, termed Auger-assisted CT.
• This mechanism circumvents the limitations of the Marcus inverted regime.
• Simulations reveal intricate interactions between electron-hole and charge-phonon energy exchange channels.

Conclusions:

• Auger-assisted CT provides a robust explanation for experimental CT rates, especially in the large energy gap regime.
• The developed Marcus rate theory accurately predicts experimental plateaus without adjustable parameters.
• The findings have broad implications for charge and energy transfer phenomena in various nanoscale systems.