Directed Energy Transfer from Monolayer $WS_{2}$ to NIR Emitting PbS-CdS Quantum Dots.
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Authors
Gauriot, Nicolas
Delport, Géraud
Li, Zhaojun
Baldwin, Alan
Publication Date
2020-11-24Journal Title
ACS Nano
ISSN
1936-0851
Publisher
American Chemical Society
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Tanoh, A., Gauriot, N., Delport, G., Xiao, J., Pandya, R., Sung, J., Allardice, J., et al. (2020). Directed Energy Transfer from Monolayer $WS_{2}$ to NIR Emitting PbS-CdS
Quantum Dots.. ACS Nano https://doi.org/10.1021/acsnano.0c05818
Abstract
Heterostructures of two-dimensional (2D) transition metal dichalcogenides
(TMDs) and inorganic semiconducting zero-dimensional (0D) quantum dots (QDs)
offer unique charge and energy transfer pathways which could form the basis of
novel optoelectronic devices. To date, most has focused on charge transfer and
energy transfer from QDs to TMDs, i.e. from 0D to 2D. Here, we present a study
of the energy transfer process from a 2D to 0D material, specifically exploring
energy transfer from monolayer tungsten disulphide ($WS_{2}$) to near infrared
(NIR) emitting lead sulphide-cadmium sulphide (PbS-CdS) QDs. The high
absorption cross section of $WS_{2}$ in the visible region combined with the
potentially high photoluminescence (PL) efficiency of PbS QD systems, make this
an interesting donor-acceptor system that can effectively use the WS2 as an
antenna and the QD as a tuneable emitter, in this case downshifting the
emission energy over hundreds of meV. We study the energy transfer process
using photoluminescence excitation (PLE) and PL microscopy, and show that 58%
of the QD PL arises due to energy transfer from the $WS_{2}$. Time resolved
photoluminescence (TRPL) microscopy studies show that the energy transfer
process is faster than the intrinsic PL quenching by trap states in the
$WS_{2}$, thus allowing for efficient energy transfer. Our results establish
that QDs could be used as tuneable and high PL efficiency emitters to modify
the emission properties of TMDs. Such TMD-QD heterostructures could have
applications in light emitting technologies, artificial light harvesting
systems or be used to read out the state of TMD devices optically in various
logic and computing applications
Relationships
Is supplemented by: https://doi.org/10.17863/CAM.58224
Sponsorship
EPSRC (1648003)
EPSRC (1648003)
Engineering and Physical Sciences Research Council (EP/M006360/1)
Engineering and Physical Sciences Research Council (EP/L015978/1)
Engineering and Physical Sciences Research Council (EP/L016087/1)
Engineering and Physical Sciences Research Council (EP/P005152/1)
Engineering and Physical Sciences Research Council (EP/P027741/1)
European Research Council (756962)
Engineering and Physical Sciences Research Council (EP/R023980/1)
European Research Council (758826)
Identifiers
External DOI: https://doi.org/10.1021/acsnano.0c05818
This record's URL: https://www.repository.cam.ac.uk/handle/1810/311754
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