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Charge Carrier Injection Electroluminescence with CO-Functionalized Tips on Single Molecular Emitters. | LitMetric

AI Article Synopsis

  • The study explores the electroluminescence of single molecules, specifically zinc phthalocyanine (ZnPc), on NaCl-supported silver (Ag(111)) and gold (Au(111)) surfaces, using advanced scanning probe microscopy techniques.
  • It highlights how the type of probe tip used (metal vs. CO-functionalized) affects the resolution and contrast of photon maps by influencing the overlap of electronic orbitals of the tip and the molecule.
  • The research suggests that the interaction between the frontier orbitals of ZnPc and the Fermi levels of the metal surfaces impacts the mechanisms of electron and hole injection into ZnPc, emphasizing the critical role of the tip's state in understanding photophysical behavior on surfaces.

Article Abstract

We investigate electroluminescence of single molecular emitters on NaCl on Ag(111) and Au(111) with submolecular resolution in a low-temperature scanning probe microscope with tunneling current, atomic force, and light detection capabilities. The role of the tip state is studied in the photon maps of a prototypical emitter, zinc phthalocyanine (ZnPc), using metal and CO-metal tips. CO-functionalization is found to have an impact on the resolution and contrast of the photon maps due to the localized overlap of the p-orbitals on the tip with the molecular orbitals of the emitter. The possibility of using the same CO-functionalized tip for tip-enhanced photon detection and high resolution atomic force is demonstrated. We study the electroluminescence of ZnPc, induced by charge carrier injection at sufficiently high bias voltages. We propose that the distinct level alignment of the ZnPc frontier orbitals with the Au(111) and Ag(111) Fermi levels governs the primary excitation mechanisms as the injection of electrons and holes from the tip into the molecule, respectively. These findings put forward the importance of the tip status in the photon maps and contribute to a better understanding of the photophysics of organic molecules on surfaces.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7116301PMC
http://dx.doi.org/10.1021/acs.nanolett.9b03180DOI Listing

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