Improving the stability and optical properties of germanane via one-step covalent methyl-termination

Shishi Jiang, Sheneve Butler, Elisabeth Bianco, Oscar D. Restrepo, Wolfgang Windl and Joshua E. Goldberger ()
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Shishi Jiang: The Ohio State University
Sheneve Butler: The Ohio State University
Elisabeth Bianco: The Ohio State University
Oscar D. Restrepo: The Ohio State University
Wolfgang Windl: The Ohio State University
Joshua E. Goldberger: The Ohio State University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Two-dimensional van der Waals materials have shown great promise for a variety of electronic, optoelectronic, sensing and energy conversion applications. Since almost every atom in these two-dimensional crystals is exposed to the surface, covalent surface termination could provide a powerful method for the controlled tuning of material properties. Here we demonstrate a facile, one-step metathesis approach that directly converts CaGe2 crystals into mm-sized crystals of methyl-terminated germanane (GeCH3). Replacing –H termination in GeH with –CH3 increases the band gap by ~0.1 eV to 1.7 eV, and produces band edge fluorescence with a quantum yield of ~0.2%, with little dependence on layer thickness. Furthermore, the thermal stability of GeCH3 has been increased to 250 °C compared with 75 °C for GeH. This one-step metathesis approach should be applicable for accessing new families of two-dimensional van der Waals lattices that feature precise organic terminations and with enhanced optoelectronic properties.

Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4389

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DOI: 10.1038/ncomms4389

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