Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge carrier injection electroluminescence with CO functionalized tips
  on single molecular emitters   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. 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 a dramatic 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 orbital 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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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg