Angle-resolved UV photoelectron spectra (UPS) of thin films of perylene-3,4,9,10-tetracarboxylic dianhydride on MoS2
- 1 May 1998
- journal article
- spectroscopy
- Published by International Union of Crystallography (IUCr) in Journal of Synchrotron Radiation
- Vol. 5 (3) , 1044-1046
- https://doi.org/10.1107/s0909049597016877
Abstract
Angle-resolved UV photoelectron spectra (ARUPS) were measured for thin films of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) deposited on cleaved MoS2 surfaces. The take-off angle (θ) dependence of the photoelectron intensity of the highest π band showed a sharp maximum at θ = 32–34°. A spectral feature of the binding energy at ∼8.9 eV, which is believed to originate from a π state, showed a remarkably different θ dependence from that of the π band. A quantitative analysis of the observed θ dependencies clearly indicates that (a) the feature at ∼8.9 eV originates from the oxygen 2p non-bonding states and (b) the molecules lie flat on the substrate surface.Keywords
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