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dc.contributor.authorGoodman, Aaron J.
dc.contributor.authorDahod, Nabeel S.
dc.contributor.authorTisdale, William
dc.date.accessioned2020-06-02T18:25:51Z
dc.date.available2020-06-02T18:25:51Z
dc.date.issued2018-07
dc.date.submitted2018-05
dc.identifier.issn1948-7185
dc.identifier.urihttps://hdl.handle.net/1721.1/125626
dc.description.abstractHybrid quantum dot (QD)/transition metal dichalcogenide (TMD) heterostructures are attractive components of next generation optoelectronic devices, which take advantage of the spectral tunability of QDs and the charge and exciton transport properties of TMDs. Here, we demonstrate tunable electronic coupling between CdSe QDs and monolayer WS[subscript 2] using variable length alkanethiol ligands on the QD surface. Using femtosecond time-resolved second harmonic generation (SHG) microscopy, we show that electron transfer from photoexcited CdSe QDs to single-layer WS2 occurs on ultrafast (50 fs to 1 ps) time scales. Moreover, in the samples exhibiting the fastest charge transfer rates (≤50 fs) we observed oscillations in the time-domain signal corresponding to an acoustic phonon mode of the donor QD, which coherently modulates the SHG response of the underlying WS2 layer. These results reveal surprisingly strong electronic coupling at the QD/TMD interface and demonstrate the usefulness of time-resolved SHG for exploring ultrafast electronic-vibrational dynamics in TMD heterostructures.en_US
dc.language.isoen
dc.publisherAmerican Chemical Society (ACS)en_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/acs.jpclett.8b01606en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourcearXiven_US
dc.titleUltrafast Charge Transfer at a Quantum Dot/2D Materials Interface Probed by Second Harmonic Generationen_US
dc.typeArticleen_US
dc.identifier.citationGoodman, Aaron J. et al. “Ultrafast Charge Transfer at a Quantum Dot/2D Materials Interface Probed by Second Harmonic Generation.” The Journal of Physical Chemistry Letters 9, 15 (August 2018): 4227–32.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Chemistryen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Chemical Engineeringen_US
dc.relation.journalJournal of Physical Chemistry Lettersen_US
dc.eprint.versionOriginal manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/NonPeerRevieweden_US
dc.date.updated2019-09-13T14:27:47Z
dspace.date.submission2019-09-13T14:27:49Z
mit.journal.volume9en_US
mit.journal.issue15en_US


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