Auger Recombination Lifetime Scaling for Type i and Quasi-Type II Core/Shell Quantum Dots

John P. Philbin*, Eran Rabani*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Having already achieved near-unity quantum yields, with promising properties for light-emitting diode, lasing, and charge separation applications, colloidal core/shell quantum dots have great technological potential. The shell thickness and band alignment of the shell and core materials are known to influence the efficiency of these devices. In many such applications, improving the efficiency requires a deep understanding of multiexcitonic states. Herein, we elucidate the shell thickness and band alignment dependencies of the biexciton Auger recombination lifetime for quasi-type II CdSe/CdS and type I CdSe/ZnS core/shell quantum dots. We find that the biexciton Auger recombination lifetime increases with the total nanocrystal volume for quasi-type II CdSe/CdS core/shell quantum dots and is independent of the shell thickness for type I CdSe/ZnS core/shell quantum dots. To perform these calculations and compute Auger recombination lifetimes, we developed a low-scaling approach based on the stochastic resolution of identity. The numerical approach provided a framework for studying the scaling of the biexciton Auger recombination lifetimes in terms of the shell thickness dependencies of the exciton radii, Coulomb couplings, and density of final states in quasi-type II CdSe/CdS and type I CdSe/ZnS core/shell quantum dots.

Original languageEnglish
Pages (from-to)5132-5138
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume11
Issue number13
DOIs
StatePublished - 2 Jul 2020

Funding

FundersFunder number
University of California Lab Fee Research ProgramLFR-17-477237
U.S. Department of EnergyDE-AC02-05CH11231, DE-SC0019140
National Energy Research Scientific Computing Center

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