Atomic resolution monitoring of cation exchange in CdSe-PbSe heteronanocrystals during epitaxial solid-solid-vapor growth
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Publication date
2014-06-11
Authors
Yalcin, Anil O.
Fan, Zhaochuan
Goris, Bart
Li, W.F.
Koster, R.S.
Fang, C. M.
Van Blaaderen, Alfons
Casavola, M.
Tichelaar, Frans D.
Bals, Sara
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Article
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Abstract
Here, we show a novel solid-solid-vapor (SSV) growth mechanism whereby epitaxial growth of heterogeneous semiconductor nanowires takes place by evaporation-induced cation exchange. During heating of PbSe-CdSe nanodumbbells inside a transmission electron microscope (TEM), we observed that PbSe nanocrystals grew epitaxially at the expense of CdSe nanodomains driven by evaporation of Cd. Analysis of atomic-resolution TEM observations and detailed atomistic simulations reveals that the growth process is mediated by vacancies.
Keywords
Cation Exchange, Colloidal Nanocrystals, Density Functional Theory, In Situ Transmission Electron Microscopy, Molecular Dynamics, Condensed Matter Physics, Bioengineering, General Chemistry, General Materials Science, Mechanical Engineering
Citation
Yalcin, A O, Fan, Z, Goris, B, Li, W F, Koster, R S, Fang, C, Van Blaaderen, A, Casavola, M, Tichelaar, F D, Bals, S, Van Tendeloo, G, Vlugt, T J H, Vanmaekelbergh, D, Zandbergen, H W & Van Huis, M A 2014, 'Atomic resolution monitoring of cation exchange in CdSe-PbSe heteronanocrystals during epitaxial solid-solid-vapor growth', Nano Letters, vol. 14, no. 6, pp. 3661-3667. https://doi.org/10.1021/nl501441w