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. 2017 Jul 24;7:6205. doi: 10.1038/s41598-017-06566-5

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© The Author(s) 2017

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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Comparison of the spectral linewidths measured from quantum dots found in correspondence to surface morphological features and smooth surfaces. (a) and (d): Photoluminescence spectra, collected under non-resonant laser excitation at a temperature of 4 K, from single QDs aligned with surface features [dip-like (Sample II) in (a) and crater-like (Sample III) in (d)]. (b) and (e): Photoluminescence spectra from single QDs, collected from the same samples as the corresponding spectra in (a) and (d), but from areas not showing any surface features. (c) and (f): Linewidths, extracted from Lorentzian fits of single emission lines measured in photoluminescence spectra like the ones shown in panels (a), (b), (d), and (e), of QDs found in correspondence to morphological features (filled red symbols) and to smooth surfaces (open blue symbols). The error bars are obtained from one standard deviation uncertainties in the Lorentzian fits.