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Circumventing the phonon bottleneck by multiphonon-mediated hot exciton cooling at the nanoscale

Chemistry

Circumventing the phonon bottleneck by multiphonon-mediated hot exciton cooling at the nanoscale

D. Jasrasaria and E. Rabani

Discover how nonradiative processes influence the performance of semiconductor nanocrystal devices in groundbreaking research by Dipti Jasrasaria and Eran Rabani. Their work on hot exciton cooling reveals rapid relaxation timescales in CdSe nanocrystals, unlocking new pathways for optimizing device efficiency.

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Playback language: English
Abstract
Nonradiative processes significantly impact the efficiency of semiconductor nanocrystal (NC)-based devices. This paper focuses on hot exciton cooling, the nonradiative relaxation of a highly excited electron/hole pair to form a band-edge exciton. Using an atomistic approach, the authors simulate cooling in CdSe NCs, finding that cooling occurs on ~30 fs timescales, circumventing the phonon bottleneck through a cascade of multiphonon-mediated relaxation events. The study also identifies NC handles for tuning the cooling timescale.
Publisher
npj Computational Materials
Published On
Aug 16, 2023
Authors
Dipti Jasrasaria, Eran Rabani
Tags
semiconductor
nanocrystal
hot exciton cooling
nonradiative relaxation
CdSe NCs
efficiency
phonon bottleneck

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