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arXiv · 1710.03537

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 Molina-Mendoza·Lucia Aballe·Michael Foerster·Tobias Korn·Miguel Angel Niño·David Perez de Lara·Emilio M. Pérez·Joaquín Fernandéz-Rossier·Andres Castellanos-Gomez
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Abstract

Two-dimensional semiconducting materials are particularly appealing for many applications. Although theory predicts a large number of two-dimensional 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 spectros-copy 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.

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Riccardo Frisenda, Joshua O. Island, Jose L. Lado, Emerson Giovanelli, Patricia Gant, Philipp Nagler, Sebastian Bange, John M. Lupton, Christian Schüller, Aday Molina-Mendoza, Lucia Aballe, Michael Foerster, Tobias Korn, Miguel Angel Niño, David Perez de Lara, Emilio M. Pérez, Joaquín Fernandéz-Rossier, Andres Castellanos-Gomez. 2017-10-10. Characterization of highly crystalline lead iodide nanosheets prepared by room-temperature solution processing. https://doi.org/10.1088/1361-6528%2Faa8e5c

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