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Issue 1, 2000
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Unoccupied electronic structure in organic thin films studied by inverse photoemission spectroscopy

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Abstract

Inverse photoemission spectroscopy (IPES) in the vacuum ultraviolet region was applied to directly observe unoccupied electronic structures in a few kinds of organic thin films. The genuine IPE spectrum for the lowest unoccupied states in a long-chain alkane film was first obtained with a fairly low level of electron irradiation. The electronic structure around the energy gap in a perylene-3,4:9,10-tetracarboxylic dianhydride (PTCDA) film was examined by combining the observed IPE spectrum with previous ultraviolet photoemission spectra, to discuss its charge carrier characteristics. IPE measurements of PTCDA films were further extended to study electron injection behaviours due to alkali metal doping into those films, and by analysing the observed results the amount of injected electrons per molecule was evaluated with relation to the dopant concentration. The derived relationship has been explained with the aid of DV-Xα calculations of the energy levels concerned.

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Publication details

The article was received on 05 May 1999, accepted on 15 Jun 1999 and first published on 22 Dec 1999


Article type: Discussion
DOI: 10.1039/A903578H
Citation: J. Mater. Chem., 2000,10, 85-89
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    Unoccupied electronic structure in organic thin films studied by inverse photoemission spectroscopy

    N. Sato, H. Yoshida and K. Tsutsumi, J. Mater. Chem., 2000, 10, 85
    DOI: 10.1039/A903578H

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