Single-Crystal Halide Perovskite Heterostructures

Arundhati Deshmukth^a, Jamie Cleron^a, Caravaggio Caniglia^a, Yinan Chen^b, Santanu Saha^b, Marina Filip^b, Hemamala Karunadasa^a

^aStanford University, Stanford, CA 94305, United States

^bUniversity of Oxford, Clarendon Laboratory, Parks rd, Oxford, 0, United Kingdom

Proceedings of MATSUS Fall 2026 Conference (MATSUSFall26)

A3 Single-Crystal Halide Perovskites: From Growth to Device Applications

Palma, Spain, 2026 October 26th - 30th

Organizer: Daniela Marongiu

Invited Speaker, Hemamala Karunadasa, presentation 159
Publication date: 22nd July 2026

Layered heterostructures, formed one monolayer at a time, have been shown to host emergent properties at the interfaces where the monolayers meet. Although impressive advances have been made in controlling these exquisite architectures, these approaches do not readily lead to inexpensive, scalable, and reproducible syntheses of well-defined interfaces. This motivates the development of one-pot syntheses of heterostructures as crystalline solids, where the precise 3D atomic coordinates of the interfaces can be resolved through single-crystal X-ray diffraction. We recently reported a synthetic strategy for the self-assembly of layered perovskite–non-perovskite heterostructures into single crystals in solution, using bifunctional organic molecules as structure-directing agents [1]. I will present various layered heterostructures synthesized in our labs and discuss how the interleaving of two different inorganic layers can markedly transform the electronic band structure [2], optical properties [3], and low-dimensional magnetism [4].

References:

[1] “Directed assembly of layered perovskite heterostructures as single crystals” Aubrey, M. L.; Saldivar Valdes, A.; Filip, M. R.; Connor, B. A.; Lindquist, K. P.; Neaton, J. B.; Karunadasa, H. I. Nature, 2021, 597, 355.

[2] “Tuning the quantum-well structure of single-crystal layered perovskite heterostructures” Deshmukh, A. P.; Chen, Y.; Cleron, J. L.; Tie, M.; Wen, J.; Heinz, T. F.; Filip, M. R.; Karunadasa, H. I. J. Am. Chem. Soc. 2025, 147, 40171.

[3] “Twisted tin-chloride perovskite single-crystal heterostructures” Cleron, J. L.; Chen, C.-Y.; Pan, F.; Saha, S.; Marlton, F. P.; Stolz, R. M.; Li, J.; Dionne, J. A.; Liu, F.; Filip, M. R.; Karunadasa, H. I. Angew. Chem. Int. Ed., 2025, e20140.

[4] “Isolation of diamond spin chains in a layered halide perovskite heterostructure” Caniglia, C. D.; Li, Y.; Wen, J.; Brueggemeyer, M. T.; Lee, Y. S.; Solomon. E. I.; Fisher, I. R.; Karunadasa, H. I. J. Am. Chem. Soc. 2025, 147, 28340.

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