Nanoscopic structure model of hydrogenated amorphous silicon (gray haze) from x-ray, neutron, and TEM data. Dense ordered domains and voids are shown as blue and red spheres, respectively. Closeups show specific atomic models.

From the article:

Quantification of Nanoscale Density Fluctuations in Hydrogenated Amorphous Silicon
Eike Gericke, Jimmy Melskens, Robert Wendt, Markus Wollgarten, Armin Hoell, and Klaus Lips
Phys. Rev. Lett. 125, 185501 (2020)

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