No Colloquium 11/23. Back next week!
Nov16
Abstract: Layered heterostructures, formed one monolayer at a time, have been shown to host exotic emergent properties at the interfaces where two monolayers meet. Although impressive advances have been made in controlling these exquisite architectures, these approaches do not readily lead to scalable and reproducible syntheses of well-defined interfaces. This motivates the synthesis of bulk crystalline solids, where the solution-state chemistry, and not the fabrication method, forms the heterostructure. We recently reported a synthetic strategy for the self-assembly of layered perovskite–non-perovskite heterostructures as single crystals in solution, where organic molecules directed the assembly [1]. I will present various layered heterostructures that form as an interleaving of perovskite slabs with a different inorganic slab and describe the unusual optoelectronic [2,3] and magnetic [4] phenomena that arise in these materials. I will also discuss the reactivity of coordination complexes placed within these nonporous solids.
[1] “Directed assembly of layered perovskite heterostructures as single crystals” Aubrey, Saldivar Valdes, Filip, Connor, Lindquist, Neaton, Karunadasa, Nature, 2021, 597, 355.
[2] “Tuning the quantum-well structure of single-crystal layered perovskite heterostructures” Deshmukh, Chen, Cleron, Tie, Wen, Heinz, Filip, Karunadasa, J. Am. Chem. Soc. 2025, 147, 40171.
[3] “Twisted tin-chloride perovskite single-crystal heterostructures” Cleron, Chen, Pan, Saha, Marlton, Stolz, Li, Dionne, Liu, Filip, Karunadasa, Angew. Chem. Int. Ed., 2025, e20140.
[4] “Isolation of diamond spin chains in a layered halide perovskite heterostructure” Caniglia, Li, Wen, Brueggemeyer, Lee, Solomon, Fisher, Karunadasa, J. Am. Chem. Soc. 2025, 147, 28340.
About Hemamala (Hema) Karunadasa
Hemamala (Hema) Karunadasa is the J. G. Jackson and C. J. Wood Professor of Chemistry, and Professor of Materials Science and Engineering, by courtesy, at Stanford University. She is a Faculty Scientist at the SLAC National Lab and a Senior Fellow of the Precourt Institute for Energy. She received her A.B. from Princeton University and her Ph.D. in inorganic chemistry from UC Berkeley, with postdoctoral training at the Lawrence Berkeley National Lab and at the California Institute of Technology. Her group uses solution-state methods for the self-assembly of solid-state materials, with an emphasis on halide perovskites and their derivatives. Her recent awards include the Brown Science Foundation Investigator award (2022) and the American Chemical Society Harry Gray award (2020) and the Inorganic Lectureship (2022). She is an Associate Editor for Chemical Science (Royal Chemical Society).
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