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Figure 8
The absorption spectra for monoclinic silicon allotropes with (a) direct and (b) quasi-direct band gaps. The absorption spectra were calculated using the HSE06 hybrid functional.

IUCrJ
Volume 10| Part 4| July 2023| Pages 464-474
ISSN: 2052-2525
https://doi.org/10.1107/S2052252523004207