Bearing a tert-butyl bulky group, t-butylammonium bromide (tBABr) is commonly used to alter perovskite structures to promote material solubility and device stability - by making them less sensitive to moisture (compared to 3D methylammonium-based perovskites).

Plate-like 2D-phase crystallites were observed standing up between the 3D perovskite grains, and crystallinity was remarkably enhanced by precursors with bulky alkyl groups present in the perovskite structure.

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