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Optical Properties and Raman-Active Phonon Modes in Two-Dimensional Honeycomb Zintl Phases

Abstract

Intermetallic Zintl phases whose structures consist of honeycomb layers of main group elements often serve as useful precursors for the two-dimensional group 14 graphane derivatives. Here, we probe how the Raman spectra and band gap evolve in these precursor intemetallic phases before they transform into their van der Waals counterparts. Through performing polarization-dependent Raman experiments on seven different group 14 and 15 Zintl phases with different stacking motifs, we show that the in-plane and out-of-plane Raman frequencies mostly depend on the reduced mass and the in-plane bond lengths of the elements constituting the honeycomb framework. From optical absorption measurements, we show that the honeycomb frameworks comprised from single elements are metallic, but when the framework is comprised of alternating elementss in a BN-like fashion, such as in NaSnP, KSnAs and KSnSb, a band gap is opened up ranging from 0.54 eV for KSnSb to 0.95 eV for NaSnP. This study allows for the determination of the structure and stacking motifs for this emerging class of 2D layered metallic and semiconducting materials.

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Publication details

The article was received on 03 May 2017, accepted on 02 Jun 2017 and first published on 02 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01907F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Optical Properties and Raman-Active Phonon Modes in Two-Dimensional Honeycomb Zintl Phases

    M. Q. Arguilla, N. D. Cultrara, M. R. Scudder, S. Jiang, R. D. Ross and J. Goldberger, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01907F

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