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Atom Probe Tomography Analysis of Ag Doping in 2D Layered Material (PbSe)5(Bi2Se3)3



Arunima Singh, Albert Davydov, Francesca M. Tavazza, Lincoln J. Lauhon, Xiaochen Ren, Mercouri G. Kanatzidis, Lei Fang


Impurity doping in two-dimensional (2D) materials can provide a route to tuning electronic properties, so it is important to be able to determine the distribution of dopant atoms within and between layers. Here we report the tomographic mapping of dopants in layered 2D materials with atomic sensitivity and sub-nanometer spatial resolution using atom probe tomography (APT). APT analysis shows that Ag dopes both Bi2Se3 and PbSe layers in (PbSe)5(Bi2Se3)3, and correlations in the position of Ag atoms suggest a pairing across neighboring Bi2Se3 and PbSe layers. Density functional theory (DFT) calculations confirm the favorability of substitutional doping for both Pb and Bi, and provide insights into the observed spatial correlations in dopant locations.
Nano Letters


atom probe tomography, doping, 2D materials, DFT, materials genome initiative


Singh, A. , Davydov, A. , Tavazza, F. , Lauhon, L. , Ren, X. , Kanatzidis, M. and Fang, L. (2016), Atom Probe Tomography Analysis of Ag Doping in 2D Layered Material (PbSe)5(Bi2Se3)3, Nano Letters, [online], (Accessed July 19, 2024)


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Created September 7, 2016, Updated November 10, 2018