Sinha, Sapna, Zhu, Taishan, France-Lanord, Arthur, Sheng, Yuewen, Grossman, Jeffrey C., Porfyrakis, Kyriakos ORCID: https://orcid.org/0000-0003-1364-0261 and Warner, Jamie H. (2020) Atomic structure and defect dynamics of monolayer lead iodide nanodisks with epitaxial alignment on graphene. Nature Communications, 11:823. ISSN 2041-1723 (Online) (doi:10.1038/s41467-020-14481-z)

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Abstract

Lead Iodide (PbI2) is a large bandgap 2D layered material that has potential for semi- conductor 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.

Item Type:	Article
Additional Information:	© The Author(s) 2020. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Uncontrolled Keywords:	2D nanomaterials, lead iodide, graphene, endohedral fullerenes
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	26 Mar 2020 21:09
URI:	http://gala.gre.ac.uk/id/eprint/27500

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