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2-Phenylethylamine Hydroiodide (Phenethylammonium iodide, PEAI) is an electronic material widely employed in organic synthesis, pharmaceuticals, and materials science. PEAI can be used as a precursor for preparing perovskite devices (such as perovskite solar cells) and also participates in other reactions, as an important intermediate for synthesising bioactive compounds and fine chemicals.

2-Phenylethylamine Hydroiodide can be used in the post-treatment of perovskite films for hysteresis-less perovskite solar cells.