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Electronic structure of designed [(SnSe)1+δ]m[TiSe2]2 heterostructure thin films with tunable layering sequence

Published online by Cambridge University Press:  29 April 2019

Fabian Göhler Open the ORCID record for Fabian Göhler [Opens in a new window] ,
Danielle M. Hamann ,
Niels Rösch ,
Susanne Wolff ,
Jacob T. Logan ,
Robert Fischer ,
Florian Speck ,
David C. Johnson  and
Thomas Seyller
Fabian Göhler
Affiliation:
Institute of Physics, Chemnitz University of Technology, D-09126 Chemnitz, Germany
Danielle M. Hamann
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon 97401, USA
Niels Rösch
Affiliation:
Institute of Physics, Chemnitz University of Technology, D-09126 Chemnitz, Germany
Susanne Wolff
Affiliation:
Institute of Physics, Chemnitz University of Technology, D-09126 Chemnitz, Germany
Jacob T. Logan
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon 97401, USA
Robert Fischer
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon 97401, USA
Florian Speck
Affiliation:
Institute of Physics, Chemnitz University of Technology, D-09126 Chemnitz, Germany
David C. Johnson
Affiliation:
Department of Chemistry, University of Oregon, Eugene, Oregon 97401, USA
Thomas Seyller*
Affiliation:
Institute of Physics, Chemnitz University of Technology, D-09126 Chemnitz, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A series of ${\left\hbox[ {{{\left\hbox( {{\rm{SnSe}}} \right\hbox)}_{1 \hbox+ \delta }}} \right\hbox]_m}{\left\hbox[ {{\rm{TiS}}{{\rm{e}}_2}} \right\hbox]_2}$ heterostructure thin films built up from repeating units of m bilayers of SnSe and two layers of TiSe2 were synthesized from designed precursors. The electronic structure of the films was investigated using X-ray photoelectron spectroscopy for samples with m = 1, 2, 3, and 7 and compared to binary samples of TiSe2 and SnSe. The observed binding energies of core levels and valence bands of the heterostructures are largely independent of m. For the SnSe layers, we can observe a rigid band shift in the heterostructures compared to the binary, which can be explained by electron transfer from SnSe to TiSe2. The electronic structure of the TiSe2 layers shows a more complicated behavior, as a small shift can be observed in the valence band and Se3d spectra, but the Ti2p core level remains at a constant energy. Complementary UV photoemission spectroscopy measurements confirm a charge transfer mechanism where the SnSe layers donate electrons into empty Ti3d states at the Fermi energy.

Keywords

electronic structurenanostructureX-ray photoelectron spectroscopy (XPS)
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 12 , 28 June 2019 , pp. 1965 - 1975
Copyright
Copyright © Materials Research Society 2019 

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