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Colloidal thick-shell pyramidal quantum dots for efficient hydrogen production
State Key Laboratory & College of Physics, Qingdao University.
State Key Laboratory & College of Physics, Qingdao University.
Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Québec University.
State Key Laboratory & College of Physics, Qingdao University.
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2018 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 53, p. 116-124Article in journal (Refereed) Published
Abstract [en]

Colloidal semiconductor quantum dots (QDs) have attracted a great attention for their potential applications in optoelectronic devices, such as water splitting, luminescent solar concentrators, and solar cells, because of their size/shape/composition-dependent optoelectronic properties. However, the fast electron-hole (e-h) recombination and slow charge separation of QDs limit their applications as light absorbers in high-efficiency optoelectronic devices. Here, we synthesized thick-shell CdSe/CdSexS1-x/CdS QDs with pyramidal shape, which exhibit a quantum yield of ~ 15%, with a long radiative lifetime up to ~ 100 ns due to the spatial separation of the e/h wavefunction and significantly broadened light absorption toward the 500–700 nm range, compared to CdSe/CdS unalloyed QDs. As a proof-of-concept, the pyramidal QDs are applied as light absorbers in a photoelectrochemical (PEC) system, leading to a saturated photocurrent density of ~ 12 mA/cm2 (with a H2 generation rate of 90 mL cm−2 day−1), which is a record for thick-shell QD-based photoelectrodes in PEC hydrogen generation. Core/thick-shell QDs hold great potential for breakthrough developments in the field of QD-based optoelectronic devices.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 53, p. 116-124
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Other Physics Topics
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Experimental Physics
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URN: urn:nbn:se:ltu:diva-70643DOI: 10.1016/j.nanoen.2018.08.042ISI: 000448994600014Scopus ID: 2-s2.0-85052227894OAI: oai:DiVA.org:ltu-70643DiVA, id: diva2:1242856
Note

Validerad;2018;Nivå 2;2018-08-29 (andbra)

Available from: 2018-08-29 Created: 2018-08-29 Last updated: 2018-11-19Bibliographically approved

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Vomiero, Alberto

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