A2Bn-1PbnI3n+1 (A = BA, PEA; B = MA; n = 1, 2): Engineering Quantum-Well Crystals for High Mass Density and Fast Scintillators

• Published in: Journal of physical chemistry. C 2023-06, Vol.127 (22), p.10737-10747
• Main Authors: Sheikh, Md Abdul Kuddus, Kowal, Dominik, Mahyuddin, Muhammad Haris, Cala', Roberto, Auffray, Etiennette, Witkowski, Marcin Eugeniusz, Makowski, Michal, Drozdowski, Winicjusz, Wang, Hong, Dujardin, Christophe, Cortecchia, Daniele, Birowosuto, Muhammad Danang
• Format: Article
• Language: English
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/acs.jpcc.3c00824

Quantum-well (QW) hybrid organic–inorganic perovskite (HOIP) crystals, e.g., A 2 PbX 4 (A = BA, PEA; X = Br, I), demonstrated significant potentials as scintillating materials for wide energy radiation detection compared to their individual three-dimensional (3D) counterparts, e.g., BPbX 3 (B = MA). Inserting 3D into QW structures resulted in new structures, namely A 2 BPb 2 X 7 perovskite crystals, and they may have promising optical and scintillation properties toward higher mass density and fast timing scintillators. In this article, we investigate the crystal structure as well as optical and scintillation properties of iodide-based QW HOIP crystals, A 2 PbI 4 and A 2 MAPb 2 I 7 . A 2 PbI 4 crystals exhibit green and red emission with the fastest PL decay time 3.0 g/cm 3 and tunable smaller bandgaps 5 times lower than those for bromides. The lower light yields can be the drawbacks of iodide-based QW HOIP scintillators, but the promising high mass density and decay time results of our study can provide the right pathway for further improvements toward fast-timing applications.