Managing Growth and Dimensionality of Quasi 2D Perovskite Single-Crystalline Flakes for Tunable Excitons Orientation.

Thanks to this technique and to the high optical quality of the crystals, we obtained detailed information on the quantitative excitonic components (in‐plane and out‐of‐plane), so that we can easily identify a clear trend of such contributions in n = 2, 3, 4, and 5 perovskites (Figure S9 , Supporting Information).

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