Characterization of highly crystalline lead iodide nanosheets prepared by room-temperature solution processing

Riccardo Frisenda, Joshua O. Island, Jose L. Lado, Emerson Giovanelli, Patricia Gant, Philipp Nagler, Sebastian Bange, John M. Lupton, Christian Schüller, Aday J. Molina-Mendoza, More Authors

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

Two-dimensional (2D) semiconducting materials are particularly appealing for many applications. Although theory predicts a large number of 2D materials, experimentally only a few of these materials have been identified and characterized comprehensively in the ultrathin limit. Lead iodide, which belongs to the transition metal halides family and has a direct bandgap in the visible spectrum, has been known for a long time and has been well characterized in its bulk form. Nevertheless, studies of this material in the nanometer thickness regime are rather scarce. In this article we demonstrate an easy way to synthesize ultrathin, highly crystalline flakes of PbI2 by precipitation from a solution in water. We thoroughly characterize the produced thin flakes with different techniques ranging from optical and Raman spectroscopy to temperature-dependent photoluminescence and electron microscopy. We compare the results to ab initio calculations of the band structure of the material. Finally, we fabricate photodetectors based on PbI2 and study their optoelectronic properties.

Original languageEnglish
Article number455703
JournalNanotechnology
Volume28
Issue number45
DOIs
Publication statusPublished - 2017

Keywords

  • ab initio calculations
  • direct bandgap
  • lead iodide
  • optoelectronics
  • PbI
  • transition metal halides
  • two-dimensional materials

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