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Issue 23, 2012
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CdSe–CdSexTe1−x nanorod heterostructures: tuning alloy composition and spatially indirect recombination energies

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Abstract

In exploiting enhanced/new properties of the emerging class of heterostructured nanocrystals, challenges remain in the synthetic control over crystal size, composition and morphology. Parallel advances in characterization that provides atomic-level details of structure and composition along with their effects on materials' properties are necessary to be able to tailor nano-heterostructures for high-end applications. Here, we develop a synthetic strategy for forming type-II nanorod heterostructures with tunable band offsets by growing CdSexTe1−x alloys of variable composition on the tips of CdSe seeds. Composition in the nanorod heterostructures is quantified with atomic column resolution using aberration-corrected high-resolution STEM Z-contrast. The combination of Z-contrast analysis, high-resolution bright-field TEM imaging and photoluminescence studies reveals the energy of charge transfer transition across the heterointerface to be linearly dependent on both lattice constant and composition. The ability to vary the valence band offset, which is difficult to achieve by quantum size effect alone due to the effective mass of the hole often being large, is also demonstrated.

Graphical abstract: CdSe–CdSexTe1−x nanorod heterostructures: tuning alloy composition and spatially indirect recombination energies

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Publication details

The article was received on 09 Mar 2012, accepted on 30 Apr 2012 and first published on 30 Apr 2012


Article type: Paper
DOI: 10.1039/C2JM31464A
Citation: J. Mater. Chem., 2012,22, 11621-11628
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    CdSe–CdSexTe1−x nanorod heterostructures: tuning alloy composition and spatially indirect recombination energies

    H. McDaniel, N. Oh and M. Shim, J. Mater. Chem., 2012, 22, 11621
    DOI: 10.1039/C2JM31464A

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