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Understanding Nonradiative Recombination through Defect-Induced Conical Intersections.

Yinan Shu¹, B Scott Fales^2,3, Wei-Tao Peng⁴

¹Department of Chemistry, University of Minnesota , Minneapolis, Minnesota 55455, United States.

The Journal of Physical Chemistry Letters

|August 12, 2017

Summary

This summary is machine-generated.

Identifying defect-induced conical intersections (DICIs) reveals how defects cause nonradiative recombination in semiconductors. This new method helps pinpoint specific defects responsible for energy loss in materials.

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Area of Science:

Solid State Physics
Materials Science
Quantum Chemistry

Background:

Defects in semiconductors often facilitate nonradiative recombination, leading to energy loss.
Identifying specific defects as nonradiative centers is a significant challenge in semiconductor research.
Traditional methods often rely on assumptions of weak electron-hole correlation or stationary nuclei.

Purpose of the Study:

To present a novel approach for identifying and characterizing defect-induced conical intersections (DICIs) in semiconductors.
To demonstrate the utility of DICIs in understanding nonradiative recombination pathways.
To explore the role of DICIs in semiconductor nanomaterials and their photoluminescence.

Main Methods:

Theoretical and computational methods for locating DICIs.
Analysis of DICIs without assuming weak correlation or stationary nuclei.
Investigating the energetic accessibility of DICIs, even when not predicted by single-particle theories like density functional theory.

Main Results:

Defect-induced conical intersections (DICIs) are identified as key points of degeneracy between electronic states.
DICIs provide a framework for understanding nonradiative recombination linked to specific defect deformations.
Energetically accessible DICIs can exist even when standard theories do not predict midgap states.

Conclusions:

DICIs offer a powerful tool for implicating specific defects in nonradiative recombination processes.
This approach advances the understanding of energy loss mechanisms in semiconductors.
Insights from DICIs illuminate the photoluminescence properties of materials like silicon nanocrystals.