Directed Energy Transfer from Monolayer WS₂ to Near-Infrared Emitting PbS-CdS Quantum Dots.

Content Provider	Europe PMC
Author	Tanoh, Arelo O. A. Gauriot, Nicolas Delport, Géraud Xiao, James Pandya, Raj Sung, Jooyoung Allardice, Jesse Li, Zhaojun Williams, Cyan A. Baldwin, Alan Stranks, Samuel D. Rao, Akshay
Copyright Year	2020
Abstract	Heterostructuresof two-dimensional (2D) transition metal dichalcogenides (TMDs) andinorganic semiconducting zero-dimensional (0D) quantum dots (QDs)offer useful charge and energy transfer pathways, which could formthe basis of future optoelectronic devices. To date, most have focusedon charge transfer and energy transfer from QDs to TMDs, that is,from 0D to 2D. Here, we present a study of the energy transfer processfrom a 2D to 0D material, specifically exploring energy transfer frommonolayer tungsten disulfide (WS2) to near-infrared emittinglead sulfide–cadmium sulfide (PbS–CdS) QDs. The highabsorption cross section of WS2 in the visible region combinedwith the potentially high photoluminescence (PL) efficiency of PbSQD systems makes this an interesting donor–acceptor systemthat can effectively use the WS2 as an antenna and theQD as a tunable emitter, in this case, downshifting the emission energyover hundreds of millielectron volts. We study the energy transferprocess using photoluminescence excitation and PL microscopy and showthat 58% of the QD PL arises due to energy transfer from the WS2. Time-resolved photoluminescence microscopy studies showthat the energy transfer process is faster than the intrinsic PL quenchingby trap states in the WS2, thus allowing for efficientenergy transfer. Our results establish that QDs could be used as tunableand high PL efficiency emitters to modify the emission propertiesof TMDs. Such TMD-QD heterostructures could have applications in light-emittingtechnologies or artificial light-harvesting systems or be used toread out the state of TMD devices optically in various logic and computingapplications.
ISSN	19360851
Journal	ACS Nano
Volume Number	14
PubMed Central reference number	PMC8155326
Issue Number	11
PubMed reference number	33078943
e-ISSN	1936086X
DOI	10.1021/acsnano.0c05818
Language	English
Publisher	AmericanChemical Society
Publisher Date	2020-10-20
Access Restriction	Open
Rights License	Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). © 2020 American ChemicalSociety
Subject Keyword	two-dimensional transition metal dichalcogenide zero-dimensional quantum dot tungsten disulfide lead sulfide−cadmiumsulfide energy transfer
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Physics and Astronomy Engineering Materials Science