Open AccessPhotoswitching of azobenzene multilayers on a layered semiconductor
Author(s) -
J. Iwicki,
E. Ludwig,
M. Kalläne,
Jens Buck,
Florian Köhler,
Rainer Herges,
L. Kipp,
Kai Roßnagel
Publication year - 2010
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.3479502
Subject(s) - azobenzene , photoisomerization , valence (chemistry) , materials science , semiconductor , x ray photoelectron spectroscopy , photoemission spectroscopy , molecule , conductance , chemical physics , optoelectronics , chemistry , condensed matter physics , nuclear magnetic resonance , biochemistry , physics , organic chemistry , isomerization , catalysis
In situ photoelectron spectroscopy is used to study the adsorption and photoisomerization of
azobenzene multilayers on the layered semiconductor HfS 2 at liquid nitrogen temperatures. The
measured valence band spectra indicate weak molecule–substrate coupling and provide evidence
for reversible switching of azobenzene multilayers by light with different wavelengths. The
photoswitching manifests itself in spectral shifts due to changes in the electrical surface conductance
and in modications of the electronic structure consistent with the results of outer valence Green’s
function calculations. The photoemission results appear to establish azobenzene as an optoelectrical
molecular switch
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