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. 2021 May 3;13:119. doi: 10.1007/s40820-021-00637-z

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a TEM image of colloidal PbSe QDs after metal chalcogenide complex treatment with a diameter of 9 nm. b ZT of the prepared PbSe(SnS₂) QD films versus temperature. c HRTEM graphs of a few (PbTe)_0.25@(PbS)_0.75 core–shell nanoparticles. d σ, S, porosity-corrected κ, and ZT at 710 K and activation energy for electrical transport in the low-temperature range (E_a), as a function of the PbS concentration in the core–shell (PbTe)_1−x (PbS)_x nanoparticles. e Synthesis of colloidal nanocrystal thin films by layer-by-layer method and strategy for optimizing TE performance. f Schematic of oleic acid ligand exchange using different iodide salts. Adapted with permission from Refs. [83–86]