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. 2020 Oct 29;11:5471. doi: 10.1038/s41467-020-19337-0

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© The Author(s) 2020

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Absorption spectra of CdTe quantum dot monolayers fabricated from colloidal quantum dot solutions with different concentrations. b Optical densities (ODs) of the absorption peaks of the monolayers (OD_mono) versus the OD of the absorption peak of the colloidal quantum dot solution (OD_sol). One of the dashed lines is proportional to OD_sol, which shows that the OD_mono is proportional to OD_sol. The other dashed line shows the value at which the OD_mono is saturated. c Dependence of the absorption peak energy of the quantum dot monolayers on OD_mono. d In-plane XRD pattern of the CdTe quantum dot monolayer with high in-plane quantum dot density (σ_in-plane), which exhibits 2D quantum resonance. The dashed line shows the peak value.