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Final solution of the last quiz:
correct answer: 2D flake of a lead iodide single crystal
From the publication:
G Grinblat, I Abdelwahab, M P Nielsen, P Dichtl, K Leng, R F Oulton, K P Loh, S A Maier. Ultrafast All-Optical Modulation in 2D Hybrid Perovskites. ACS Nano, 13 (8), pp. 9504-9510, 2019, ISSN: 1936-0851.
NOTE: Your e-mail address will only be used to run this competition and will be deleted after the winner has been determined. The winner will be drawn from all participants providing the correct answer. Please participate only once per quiz question.