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On-surface Synthesis of a Semiconducting 2D Metal-Organic Framework Cu3(C6O6) Exhibiting Dispersive Electronic Bands

On-surface Synthesis of a Semiconducting 2D Metal-Organic Framework Cu3(C6O6) Exhibiting Dispersive Electronic Bands

Angewandte Chemie 2019:

We have synthesized a 2D metal-organic framework (2D-MOF) on a Cu(111) substrate using benzenehexol molecules. By means of combined techniques of scanning tunneling microscopy and spectroscopy, X-ray photoelectron spectroscopy and density-functional theory, we determine the structure of the 2D-MOF to be Cu 3 (C 6 O 6 ) which is stabilized by O-Cu-O bonding motifs. We find that upon adsorption on Cu(111), the 2D-MOF features a semiconductor band structure with a direct band gap of 1.5 eV. The O-Cu-O bonds offer efficient charge delocalization which gives rise to a highly dispersive conduction band with an effective mass of 0.45 m e at the band bottom, implying a high electron mobility in this material.

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Accession: 069602312

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PMID: 31823485

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