Using Chirality and Symmetry Breaking to Tailor Hybrid Metal Halide Perovskite Structures and Properties

Hybrid organic-inorganic perovskite (HOIP) semiconductors offer unprecedented opportunity to control structure and properties using both inorganic and organic realms of chemistry and materials science,¹ and such tunability offers wide-ranging potential for applications including solar cells, light-emitting devices, detectors, transistors, spintronics, and advanced computing devices. This talk will focus on the impact of the organic cation (including use of chirality and cation mixing) on distortion and symmetry, and on how such structural control impacts properties. Exemplary topics will include recent studies exploring homochiral vs heterochiral cation mixing to impact spin splitting² and considering how isomer cation choice impacts melting and glass crystallization kinetics.³ Detailed X-ray/neutron examination of structure through crystal-crystal and glass-crystal transitions also provides opportunity for better understanding the role played by hydrogen bonding in shaping local and long-range order. The discussed symmetry-related tunability highlights the promise of using the organic component to control light, charge and spin within the wide-ranging HOIP family.<br/><br/>1. D. B. Mitzi, K. Chondroudis, C. R. Kagan, <i>IBM J. Res. & Dev. </i>45, 29 (2001).<br/>2. Y. Xie, H. Hewa-Walpitage, J. Morgenstein, V. Blum, Z. V. Vardeny, D. B. Mitzi, <i>ACS Mater. Lett. </i>https://doi.org/10.1021/acsmaterialslett.4c00558 (2024).<br/>3. A. Singh, Y. Xie, C. Adams III, B. G. Bobay, D. B. Mitzi, <i>Chem. Sci..</i>15, 6432 (2024).