Emerging perovskite monolayers

• Published in: Nature materials Vol. 20; no. 10; pp. 1325 - 1336
• Main Authors: Ricciardulli, Antonio Gaetano, Yang, Sheng, Smet, Jurgen H., Saliba, Michael
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01-10-2021; Nature Publishing Group
• Subjects: 639/301/1005; 639/638/298; Absorptivity; Biomaterials; Chemistry and Materials Science; Condensed Matter Physics; Crystals; Electronic structure; Ferroelectricity; High temperature; Magnetoresistance; Magnetoresistivity; Materials Science; Metal halides; Molecular structure; Monolayers; Nanotechnology; Optical and Electronic Materials; Perovskites; Physics; Playgrounds; Review Article; Semiconductors; Superconductivity; Two dimensional materials
• ISSN: 1476-1122; 1476-4660
• DOI: 10.1038/s41563-021-01029-9

The library of two-dimensional (2D) materials has been enriched over recent years with novel crystal architectures endowed with diverse exciting functionalities. Bulk perovskites, including metal-halide and oxide systems, provide access to a myriad of properties through molecular engineering. Their tunable electronic structure offers remarkable features from long carrier-diffusion lengths and high absorption coefficients in metal-halide perovskites to high-temperature superconductivity, magnetoresistance and ferroelectricity in oxide perovskites. Emboldened by the 2D materials research, perovskites down to the monolayer limit have recently emerged. Like other 2D species, perovskites with reduced dimensionality are expected to exhibit new physics and to herald next-generation multifunctional devices. In this Review, we critically assess the preliminary studies on the synthetic routes and inherent properties of monolayer perovskite materials. We also discuss how to exploit them for widespread applications and provide an outlook on the challenges and opportunities that lie ahead for this enticing class of 2D materials.
Metal-halide and oxide perovskites are a rich playground for fundamental studies and applications. This Review focuses on the opportunities opened by reducing the dimensionality of these materials to two-dimensional monolayers.