From dilute isovalent substitution to alloying in CdSeTe nanoplatelets

Ron Tenne, Silvia Pedetti, Miri Kazes, Sandrine Ithurria, Lothar Houben, Brice Nadal, Dan Oron, Benoit Dubertret

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Cadmium chalcogenide nanoplatelet (NPL) synthesis has recently witnessed a significant advance in the production of more elaborate structures such as core/shell and core/crown NPLs. However, controlled doping in these structures has proved difficult because of the restrictive synthetic conditions required for 2D anisotropic growth. Here, we explore the incorporation of tellurium (Te) within CdSe NPLs with Te concentrations ranging from doping to alloying. For Te concentrations higher than ∼30%, the CdSexTe(1-x) NPLs show emission properties characteristic of an alloyed material with a bowing of the band gap for increased concentrations of Te. This behavior is in line with observations in bulk samples and can be put in the context of the transition from a pure material to an alloy. In the dilute doping regime, CdSe:Te NPLs, in comparison to CdSe NPLs, show a distinct photoluminescence (PL) red shift and prolonged emission lifetimes (LTs) associated with Te hole traps which are much deeper than in bulk samples. Furthermore, single particle spectroscopy reveals dramatic modifications in PL properties. In particular, doped NPLs exhibit photon antibunching and emission dynamics significantly modified compared to undoped or alloyed NPLs.

Original languageEnglish
Pages (from-to)15295-15303
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number22
DOIs
Publication statusPublished - Jan 1 2016

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    Tenne, R., Pedetti, S., Kazes, M., Ithurria, S., Houben, L., Nadal, B., Oron, D., & Dubertret, B. (2016). From dilute isovalent substitution to alloying in CdSeTe nanoplatelets. Physical Chemistry Chemical Physics, 18(22), 15295-15303. https://doi.org/10.1039/c6cp01177b