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5 August 2021 Structural characterization of a polycrystalline epitaxially-fused colloidal quantum dot superlattice by electron tomography
Xiaolei Chu, Hamed Heidari, Alex Abelson, Matthew Law, Caroline Qian, Gergely Zimanyi, Davis Unruh, Chase Hansen, Adam J. Moule
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Proceedings Volume 11802, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVIII; 1180204 (2021) https://doi.org/10.1117/12.2595872
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
We analyze the 3D structure of a 120×38 nm disc-shaped region of a PbSe QD epi-SL using full-tilt high-angle annular dark-field electron tomography. The high spatial resolution enables determination of the center-of-mass coordinates of all 1846 QDs in the sample as well as the size and shape of the thousands of epitaxial connections (necks) between the QDs. A map of the neck network is used to quantify relationships between neck number (the number of necks each QD possesses), average neck diameter, QD location in the film, and the nearest neighbor inter-QD distance and distance distribution. An electronic model demonstrates how neck distribution and SL defects reduce charge mobility.
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Xiaolei Chu, Hamed Heidari, Alex Abelson, Matthew Law, Caroline Qian, Gergely Zimanyi, Davis Unruh, Chase Hansen, and Adam J. Moule "Structural characterization of a polycrystalline epitaxially-fused colloidal quantum dot superlattice by electron tomography", Proc. SPIE 11802, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVIII, 1180204 (5 August 2021); https://doi.org/10.1117/12.2595872
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KEYWORDS
Neck
Electron tomography
Quantum dots
Superlattices
Solids
Spatial resolution
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