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An unusual self-assembly pattern was observed for highly ordered 1500-nm-thick films of monodisperse 13-nm-sized colloidal PbSe quantum dots, originating from their faceted truncated cube-like shape. Specifically, self-assembled PbSe dots exhibited attachment to the substrate by <001> planes followed by interconnection through the {001} facets in plan-view and {110} / {111} facets in cross-sectional-view, thus forming a cubic superlattice. The thermoelectric properties of the PbSe superlattice thin films were investigated by means of frequency domain thermoreflectance, scanning thermal probe microscopy, four probe measurements, and augmented by computational efforts. Thermal conductivity of the superlattice films was measured as low as 0.7 W m–1 K–1 at room temperature due to the developed nanostructure. The low values of electrical conductivity were attributed to the presence of insulating oleate capping ligands at the dots’ surface and the small contact area between the PbSe dots within the superlattice. Experimental efforts aiming at the removal of the oleate ligands were conducted by annealing or molten-salt treatment, and in the latter case, yielded a promising improvement by two orders of magnitude in thermoelectric performance. The result indicates that the straightforward molten-salt treatment is an interesting approach to derive thermoelectric dot superlattice thin films over a centimeter-sized area.

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  This is the peer reviewed version of the following article: V. Sousa, M. Goto, M. S. Claro, S. Pyrlin, L. Marques, E. B. Modin, O. I. Lebedev, S. M. Alizadeh, C. Freitas, E. M. F. Vieira, K. Kovnir, P. Alpuim, T. Mori, Y. V. Kolen'ko, PbSe Quantum Dot Superlattice Thin Films for Thermoelectric Applications. Adv. Funct. Mater. 2024, 2409216, which has been published in final form at https://doi.org/10.1002/adfm.202409216. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

Keyword: self-assembling, microstructure, molten salt, Seebeck coefficient, transport properties , thermal conductivity, PbSe

Date published: 2024-07-12

Publisher: Wiley-Blackwell

Journal:

• ADVANCED FUNCTIONAL MATERIALS (ISSN: 16163028) 2409216

Funding:

• 国立研究開発法人科学技術振興機構 JPMJMI19A1 (JST Mirai Program)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4706

First published URL: https://doi.org/10.1002/adfm.202409216

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Updated at: 2025-07-12 08:30:20 +0900

Published on MDR: 2025-07-12 08:17:30 +0900