Atomic structure and defect dynamics of monolayer lead iodide nanodisks with epitaxial alignment on graphene

Sapna Sinha, Taishan Zhu, Arthur France-Lanord, Yuewen Sheng, Jeffrey C. Grossman, Kyriakos Porfyrakis and Jamie H. Warner ()
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Sapna Sinha: University of Oxford
Taishan Zhu: Massachusetts Institute of Technology
Arthur France-Lanord: Massachusetts Institute of Technology
Yuewen Sheng: University of Oxford
Jeffrey C. Grossman: Massachusetts Institute of Technology
Kyriakos Porfyrakis: University of Greenwich, Central Avenue, Chatham Maritime
Jamie H. Warner: University of Texas at Austin

Nature Communications, 2020, vol. 11, issue 1, 1-13

Abstract: Abstract Lead Iodide (PbI2) is a large bandgap 2D layered material that has potential for semiconductor applications. However, atomic level study of PbI2 monolayer has been limited due to challenges in obtaining thin crystals. Here, we use liquid exfoliation to produce monolayer PbI2 nanodisks (30-40 nm in diameter and > 99% monolayer purity) and deposit them onto suspended graphene supports to enable atomic structure study of PbI2. Strong epitaxial alignment of PbI2 monolayers with the underlying graphene lattice occurs, leading to a phase shift from the 1 T to 1 H structure to increase the level of commensuration in the two lattice spacings. The fundamental point vacancy and nanopore structures in PbI2 monolayers are directly imaged, showing rapid vacancy migration and self-healing. These results provide a detailed insight into the atomic structure of monolayer PbI2, and the impact of the strong van der Waals interaction with graphene, which has importance for future applications in optoelectronics.

Date: 2020
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DOI: 10.1038/s41467-020-14481-z

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