Optimized Cation Exchange for Mercury Chalcogenide 2D Nanoplatelets and Its Application for Alloys
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comunitat-uji-handle3:10234/8638
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Title
Optimized Cation Exchange for Mercury Chalcogenide 2D Nanoplatelets and Its Application for AlloysAuthor (s)
Date
2021-11-29Publisher
American Chemical SocietyISSN
0897-4756; 1520-5002Bibliographic citation
Corentin Dabard, Josep Planelles, Hong Po, Eva Izquierdo, Lina Makke, et al.. Optimized cation exchange for mercury chalcogenides 2D nanoplatelets and its application for alloys. Chemistry of Materials, American Chemical Society, 2021, 10.1021/acs.chemmater.1c02951Type
info:eu-repo/semantics/articlePublisher version
https://pubs.acs.org/doi/full/10.1021/acs.chemmater.1c02951Version
info:eu-repo/semantics/submittedVersionSubject
Abstract
II–VI two-dimensional (2D) nanoplatelets (NPLs) exhibit the narrowest optical features among nanocrystals (NCs). This property remains true for Hg-based NPLs, despite a cation exchange procedure to obtain them from ... [+]
II–VI two-dimensional (2D) nanoplatelets (NPLs) exhibit the narrowest optical features among nanocrystals (NCs). This property remains true for Hg-based NPLs, despite a cation exchange procedure to obtain them from Cd-based NPLs, which leads to structural defects (poorly defined edges and voids) inducing inhomogeneous broadening. Here, we propose an optimized procedure for which a solvent, surface chemistry, and reaction conditions are rationally considered. The procedure is applied to the growth of alloyed HgSe1–xTex NPLs with various compositions. We report a bright photoluminescence for all compositions. Structural properties being now well defined, it is possible to study the electronic properties of these objects. To do so, we combine k·p modeling of quantum-confined structures with X-ray photoemission. In particular, we clarify the origin of the similarity between CdTe and HgTe NPLs absorption spectra despite their vastly differing bulk band structures. Finally, static- and time-resolved photoemission unveil a crossover from n- to p-type behavior in HgSe1–xTex NPLs while increasing the Te content. [-]
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Chem. Mater. 2021, 33, 23, 9252-9261Funder Name
European Commission | Region Ile-de-France | French National Research Agency (ANR) | IPERNano2 | Copin | Frontal | Graskop | NITQuantum | Bright | MixDferro | Generalitat Valenciana
Project code
853049 | 756225 | dopQD | ANR11-IDEX-0004-02 | ANR-18CE30-0023-01 | ANR-19-CE24-0022 | ANR-19-CE09-0017 | ANR-19-CE09-0026 | ANR-20-ASTR-0008-01 | ANR-21-CE24-0012-02 | ANR-21-CE09-0029 | Prometeo/2018/098
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Copyright © American Chemical Society
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info:eu-repo/semantics/openAccess
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