Ultrafast Carrier Self-Trapping Driven by Strong Exciton–Phonon Coupling in 2D MA 3 Bi 2 I 6 Cl 3 Perovskite - Kodimana Ramakrishnan Pradeep; Paribesh Acharyya; Pronoy Nandi; Thomas S. Ie; Beiye C. Li; David J. Gosztola; Gregory S. Engel; Richard D. Schaller; Mercouri G. Kanatzidis (Journal of the American Chemical Society, 2026)