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dc.contributor.author
Yoon, Seog Joon
dc.contributor.author
Guo, Zhi
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Dos Santos Claro, Paula Cecilia
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Shevchenko, Elena V.
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Huang, Libai
dc.date.available
2018-05-30T12:14:42Z
dc.date.issued
2016-07
dc.identifier.citation
Yoon, Seog Joon; Guo, Zhi; Dos Santos Claro, Paula Cecilia; Shevchenko, Elena V.; Huang, Libai; Direct Imaging of Long-Range Exciton Transport in Quantum Dot Superlattices by Ultrafast Microscopy; American Chemical Society; ACS Nano; 10; 7; 7-2016; 7208-7215
dc.identifier.issn
1936-0851
dc.identifier.uri
http://hdl.handle.net/11336/46559
dc.description.abstract
Long-range charge and exciton transport in quantum dot (QD) solids is a crucial challenge in utilizing QDs for optoelectronic applications. Here, we present a direct visualization of exciton diffusion in highly ordered CdSe QDs superlattices by mapping exciton population using ultrafast transient absorption microscopy. A temporal resolution of ∼200 fs and a spatial precision of ∼50 nm of this technique provide a direct assessment of the upper limit for exciton transport in QD solids. An exciton diffusion length of ∼125 nm has been visualized in the 3 ns experimental time window and an exciton diffusion coefficient of (2.5 ± 0.2) × 10–2 cm2 s–1 has been measured for superlattices constructed from 3.6 nm CdSe QDs with center-to-center distance of 6.7 nm. The measured exciton diffusion constant is in good agreement with Förster resonance energy transfer theory. We have found that exciton diffusion is greatly enhanced in the superlattices over the disordered films with an order of magnitude higher diffusion coefficient, pointing toward the role of disorder in limiting transport. This study provides important understandings on energy transport mechanisms in both the spatial and temporal domains in QD solids.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Chemical Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Energy Transfer
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Femtosecond Transient Absorption
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Spectroscopy
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Pump-Probe Microscopy
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Exciton Diffusion
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Quantum Dot Solids
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Nano-materiales
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Nanotecnología
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INGENIERÍAS Y TECNOLOGÍAS
dc.title
Direct Imaging of Long-Range Exciton Transport in Quantum Dot Superlattices by Ultrafast Microscopy
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-05-29T18:35:19Z
dc.journal.volume
10
dc.journal.number
7
dc.journal.pagination
7208-7215
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Yoon, Seog Joon. University of Notre Dame-Indiana; Estados Unidos
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Fil: Guo, Zhi. Purdue University; Estados Unidos
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Fil: Dos Santos Claro, Paula Cecilia. Argonne National Laboratory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Shevchenko, Elena V.. Argonne National Laboratory; Estados Unidos
dc.description.fil
Fil: Huang, Libai. Purdue University; Estados Unidos
dc.journal.title
ACS Nano
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1021/acsnano.6b03700
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/acsnano.6b03700
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