Area and thickness dependence of Auger recombination in nanoplatelets

John P. Philbin, Alexandra Brumberg, Benjamin T. Diroll, Wooje Cho, Dmitri V. Talapin, Richard D. Schaller, Eran Rabani*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The ability to control both the thickness and the lateral dimensions of colloidal nanoplatelets offers a test-bed for area and thickness dependent properties in 2D materials. An important example is Auger recombination, which is typically the dominant process by which multiexcitons decay in nanoplatelets. Herein, we uncover fundamental properties of biexciton decay in nanoplatelets by comparing the Auger recombination lifetimes based on interacting and noninteracting formalisms with measurements based on transient absorption spectroscopy. Specifically, we report that electron-hole correlations in the initial biexcitonic state must be included in order to obtain Auger recombination lifetimes in agreement with experimental measurements and that Auger recombination lifetimes depend nearly linearly on the lateral area and somewhat more strongly on the thickness of the nanoplatelet. We also connect these scalings to those of the area and thickness dependencies of single exciton radiative recombination lifetimes, exciton coherence areas, and exciton Bohr radii in these quasi-2D materials.

Original languageEnglish
Article number054104
JournalJournal of Chemical Physics
Volume153
Issue number5
DOIs
StatePublished - 7 Aug 2020

Funding

FundersFunder number
National Science Foundation DMREFDGE-1324585, DMR-1629361, DMR-1629383, DMR-1629601
University of California Lab Fee Research ProgramLFR-17-477237
U.S. Department of EnergyDE-AC02-05CH11231
Office of Science
Basic Energy SciencesDE-AC02-06CH11357
National Energy Research Scientific Computing Center

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