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Main Title: Colloidal synthesis and optical properties of type-II CdSe-CdTe and inverted CdTe-CdSe core-wing heteronanoplatelets
Author(s): Antanovich, Artsiom
Prudnikau, Anatol
Melnikau, Dimitry
Rakovich, Yury P.
Chuvilin, Andrey
Woggon, Ulrike
Achtstein, Alexander W.
Artemyev, Mikhail
Type: Article
Language Code: en
Abstract: We developed colloidal synthesis to investigate the structural and electronic properties of CdSe-CdTe and inverted CdTe-CdSe heteronanoplatelets and experimentally demonstrate that the overgrowth of cadmium selenide or cadmium telluride core nanoplatelets with counterpartner chalcogenide wings leads to type-II heteronanoplatelets with emission energies defined by the bandgaps of the CdSe and CdTe platelets and the characteristic band offsets. The observed conduction and valence band offsets of 0.36 eV and 0.56 eV are in line with theoretical predictions. The presented type-II heteronanoplatelets exhibit efficient spatially indirect radiative exciton recombination with a quantum yield as high as 23%. While the exciton lifetime is strongly prolonged in the investigated type-II 2D systems with respect to 2D type-I systems, the occurring 2D giant oscillator strength (GOST) effect still leads to a fast and efficient exciton recombination. This makes type-II heteronanoplatelets interesting candidates for low threshold lasing applications and photovoltaics.
Issue Date: 2015
Date Available: 25-Oct-2017
DDC Class: 600 Technik, Technologie
Usage rights: Terms of German Copyright Law
Journal Title: Nanoscale
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 7
Issue: 17
Publisher DOI: 10.1039/c4nr07134d
Page Start: 8084
Page End: 8092
EISSN: 2040-3372
ISSN: 2040-3364
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:Fachgebiet Nichtlineare Optik » Publications

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