Atomically Resolved Band Bending Effects in a p-n
Heterojunction of Cu2O and a Cobalt Macrocycle
Version 2 2017-10-19, 19:18
Version 1 2017-10-17, 17:34
Posted on 2017-10-19 - 19:18
We present a hetero
junction based on macrocyclic hydrogen evolution
catalysts (HEC) physisorbed on a single crystalline Cu2O(111) surface. Angle-resolved X-ray photoelectron spectroscopy (ARXPS)
provides the spatial resolution of the band bending within the first
nanometer of the subsurface region. Oxygen vacancies on the Cu2O(111) surface cause a downward band bending which is conserved
upon adsorption of HEC layers of various thicknesses. This allows
photoexcited electrons to be directed toward the surface where they
can be made available for the reduction of protons by the HEC. Furthermore,
Poisson’s equation relates more subtle changes in the measured
ARXPS spectra to the local charge density profile within the first
7 Å away from the surface and with atomic resolution. All observations
are consistent with a polarization of the molecular layer in response
to the electrical field at the oxide surface, which should be a general
phenomenon at such organic-oxide heterointerfaces.
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Leuenberger, Dominik; Zabka, Wolf-D.; Shah, Oliver-F.
R.; Schnidrig, Stephan; Probst, Benjamin; Alberto, Roger; et al. (2017). Atomically Resolved Band Bending Effects in a p-n
Heterojunction of Cu2O and a Cobalt Macrocycle. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.7b02486
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AUTHORS (7)
DL
Dominik Leuenberger
WZ
Wolf-D. Zabka
OS
Oliver-F.
R. Shah
SS
Stephan Schnidrig
BP
Benjamin Probst
RA
Roger Alberto
JO
Jürg Osterwalder