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- Title
Ligand‐Induced Chirality in ClMBA<sub>2</sub>SnI<sub>4</sub> 2D Perovskite.
- Authors
Coccia, Clarissa; Morana, Marta; Mahata, Arup; Kaiser, Waldemar; Moroni, Marco; Albini, Benedetta; Galinetto, Pietro; Folpini, Giulia; Milanese, Chiara; Porta, Alessio; Mosconi, Edoardo; Petrozza, Annamaria; De Angelis, Filippo; Malavasi, Lorenzo
- Abstract
Chiral perovskites possess a huge applicative potential in several areas of optoelectronics and spintronics. The development of novel lead‐free perovskites with tunable properties is a key topic of current research. Herein, we report a novel lead‐free chiral perovskite, namely (R/S−)ClMBA2SnI4 (ClMBA=1‐(4‐chlorophenyl)ethanamine) and the corresponding racemic system. ClMBA2SnI4 samples exhibit a low band gap (2.12 eV) together with broad emission extending in the red region of the spectrum (∼1.7 eV). Chirality transfer from the organic ligand induces chiroptical activity in the 465–530 nm range. Density functional theory calculations show a Rashba type band splitting for the chiral samples and no band splitting for the racemic isomer. Self‐trapped exciton formation is at the origin of the large Stokes shift in the emission. Careful correlation with analogous lead and lead‐free 2D chiral perovskites confirms the role of the symmetry‐breaking distortions in the inorganic layers associated with the ligands as the source of the observed chiroptical properties providing also preliminary structure‐property correlation in 2D chiral perovskites.
- Subjects
PEROVSKITE; CHIRALITY of nuclear particles; INTRAMOLECULAR proton transfer reactions; CHIRALITY; DENSITY functional theory; BAND gaps; STOKES shift
- Publication
Angewandte Chemie, 2024, Vol 136, Issue 10, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202318557