Macroscopic transition metal dichalcogenides monolayers with uniformly high optical quality

Qiuyang Li, Adam Alfrey, Jiaqi Hu, Nathanial Lydick, Eunice Paik, Bin Liu, Haiping Sun, Yang Lu, Ruoyu Wang, Stephen Forrest and Hui Deng ()
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Qiuyang Li: University of Michigan
Adam Alfrey: University of Michigan
Jiaqi Hu: University of Michigan
Nathanial Lydick: University of Michigan
Eunice Paik: University of Michigan
Bin Liu: University of Michigan
Haiping Sun: University of Michigan
Yang Lu: University of Michigan
Ruoyu Wang: University of Michigan
Stephen Forrest: University of Michigan
Hui Deng: University of Michigan

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The unique optical properties of transition metal dichalcogenide (TMD) monolayers have attracted significant attention for both photonics applications and fundamental studies of low-dimensional systems. TMD monolayers of high optical quality, however, have been limited to micron-sized flakes produced by low-throughput and labour-intensive processes, whereas large-area films are often affected by surface defects and large inhomogeneity. Here we report a rapid and reliable method to synthesize macroscopic-scale TMD monolayers of uniform, high optical quality. Using 1-dodecanol encapsulation combined with gold-tape-assisted exfoliation, we obtain monolayers with lateral size > 1 mm, exhibiting exciton energy, linewidth, and quantum yield uniform over the whole area and close to those of high-quality micron-sized flakes. We tentatively associate the role of the two molecular encapsulating layers as isolating the TMD from the substrate and passivating the chalcogen vacancies, respectively. We demonstrate the utility of our encapsulated monolayers by scalable integration with an array of photonic crystal cavities, creating polariton arrays with enhanced light-matter coupling strength. This work provides a pathway to achieving high-quality two-dimensional materials over large areas, enabling research and technology development beyond individual micron-sized devices.

Date: 2023
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DOI: 10.1038/s41467-023-37500-1

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