Exciton size and quantum transport in nanoplatelets

Kenley M. Pelzer, Seth B. Darling, Stephen K. Gray, Richard D Schaller

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Two-dimensional nanoplatelets (NPLs) are an exciting class of materials with promising optical and energy transport properties. The possibility of efficient energy transport between nanoplatelets raises questions regarding the nature of energy transfer in these thin, laterally extended systems. A challenge in understanding exciton transport is the uncertainty regarding the size of the exciton. Depending on the material and defects in the nanoplatelet, an exciton could plausibly extend over an entire plate or localize to a small region. The variation in possible exciton sizes raises the question how exciton size impacts the efficiency of transport between nanoplatelet structures. Here, we explore this issue using a quantum master equation approach. This method goes beyond the assumptions of Förster theory to allow for quantum mechanical effects that could increase energy transfer efficiency. The model is extremely flexible in describing different systems, allowing us to test the effect of varying the spatial extent of the exciton. We first discuss qualitative aspects of the relationship between exciton size and transport and then conduct simulations of exciton transport between NPLs for a range of exciton sizes and environmental conditions. Our results reveal that exciton size has a strong effect on energy transfer efficiency and suggest that manipulation of exciton size may be useful in designing NPLs for energy transport.

Original languageEnglish
Article number224106
JournalJournal of Chemical Physics
Volume143
Issue number22
DOIs
Publication statusPublished - Dec 14 2015

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excitons
Energy transfer
energy transfer
LDS 751
Transport properties
energy
manipulators
transport properties
Defects
defects

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Exciton size and quantum transport in nanoplatelets. / Pelzer, Kenley M.; Darling, Seth B.; Gray, Stephen K.; Schaller, Richard D.

In: Journal of Chemical Physics, Vol. 143, No. 22, 224106, 14.12.2015.

Research output: Contribution to journalArticle

Pelzer, Kenley M. ; Darling, Seth B. ; Gray, Stephen K. ; Schaller, Richard D. / Exciton size and quantum transport in nanoplatelets. In: Journal of Chemical Physics. 2015 ; Vol. 143, No. 22.
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