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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Shishi Jiang & Sheneve Butler & Elisabeth Bianco & Oscar D. Restrepo & Wolfgang Windl & Joshua E. Goldberger, 2014. "Improving the stability and optical properties of germanane via one-step covalent methyl-termination," Nature Communications, Nature, vol. 5(1), pages 1-6, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4389
    DOI: 10.1038/ncomms4389
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