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dc.contributor.authorLiu, Mengxia
dc.contributor.authorVerma, Sachin Dev
dc.contributor.authorZhang, Zhilong
dc.contributor.authorSung, Jooyoung
dc.contributor.authorRao, Akshay
dc.date.accessioned2021-11-25T00:30:42Z
dc.date.available2021-11-25T00:30:42Z
dc.date.issued2021-11-10
dc.identifier.issn1530-6984
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/331061
dc.description.abstractUnderstanding carrier dynamics and transport in quantum dot based heterostructures is crucial for unlocking their full potential for optoelectronic applications. Here we report the direct visualization of carrier propagation in PbS CQD solids and quantum-dot-in-perovskite heterostructures using femtosecond transient absorption microscopy. We reveal three distinct transport regimes: an initial superdiffusive transport persisting over hundreds of femtoseconds, an Auger-assisted subdiffusive transport before thermal equilibrium is achieved, and a final hopping regime. We demonstrate that the superdiffusive transport lengths correlate strongly with the degree of energetic disorder and carrier delocalization. By tailoring the perovskite content in heterostructures, we obtained a superdiffusive transport length exceeding 90 nm at room temperature and an equivalent diffusivity of up to 106 cm2 s-1, which is 4 orders of magnitude higher than the steady-state values. These findings introduce promising strategies to harness nonequilibrium transport phenomena for more efficient optoelectronic devices.
dc.languageeng
dc.publisherAmerican Chemical Society (ACS)
dc.rightsAll rights reserved
dc.rights.urihttp://www.rioxx.net/licenses/all-rights-reserved
dc.subjectnonequilibrium carrier transport
dc.subjectquantum dots
dc.subjecttransient absorption microscopy
dc.subjectultrafast dynamics
dc.titleNonequilibrium Carrier Transport in Quantum Dot Heterostructures.
dc.typeArticle
prism.endingPage8951
prism.issueIdentifier21
prism.publicationDate2021
prism.publicationNameNano Lett
prism.startingPage8945
prism.volume21
dc.identifier.doi10.17863/CAM.78506
rioxxterms.versionofrecord10.1021/acs.nanolett.1c01892
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2021-11-10
dc.contributor.orcidLiu, Mengxia [0000-0002-1676-705X]
dc.contributor.orcidVerma, Sachin Dev [0000-0002-6312-9333]
dc.contributor.orcidZhang, Zhilong [0000-0001-9903-4945]
dc.contributor.orcidRao, Akshay [0000-0003-4261-0766]
dc.identifier.eissn1530-6992
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEuropean Research Council (758826)
cam.issuedOnline2021-11-01
cam.orpheus.success2021-11-24 - Embargo set during processing via Fast-track
rioxxterms.freetoread.startdate2022-11-10


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