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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Sapna Sinha & Taishan Zhu & Arthur France-Lanord & Yuewen Sheng & Jeffrey C. Grossman & Kyriakos Porfyrakis & Jamie H. Warner, 2020. "Atomic structure and defect dynamics of monolayer lead iodide nanodisks with epitaxial alignment on graphene," Nature Communications, Nature, vol. 11(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14481-z
    DOI: 10.1038/s41467-020-14481-z
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    Cited by:

    1. Jingxian Zhong & Dawei Zhou & Qi Bai & Chao Liu & Xinlian Fan & Hehe Zhang & Congzhou Li & Ran Jiang & Peiyi Zhao & Jiaxiao Yuan & Xiaojiao Li & Guixiang Zhan & Hongyu Yang & Jing Liu & Xuefen Song & , 2024. "Growth of millimeter-sized 2D metal iodide crystals induced by ion-specific preference at water-air interfaces," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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