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Influence of film thickness and air exposure on the transport gap of manganese phthalocyanine
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Figures

Image of FIG. 1.

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FIG. 1.

UP (a, b, c) and IP (d) spectra of MnPc at different thicknesses deposited onto Co foil. The spectra are normalized and a vertical offset is introduced for clarity. UP spectra: secondary electron cutoff (a), an overview of the valence band region (b), and the HOMO region (c). The inset exemplifies the HOMO and LUMO onset determination. For each spectrum the HOMO and LUMO onsets are marked by vertical bars (c, d).

Image of FIG. 2.

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FIG. 2.

Fitted UP and IP spectra of a 20 nm thick MnPc film before and after air exposure, as well as after annealing the sample (a). Thickness dependent energy band diagram of the MnPc/Co interface and energy levels after air exposure and heating (b).

Image of FIG. 3.

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FIG. 3.

The imaginary part of the dielectric function of MnPc (green line), air exposed MnPc (gray line) and CuPc (red dashed line). The data for CuPc (Ref. ) were divided by a factor of 4. The vertical dashed lines mark the most important peak positions for MnPc.

Tables

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Table I.

Work function (), ionization energy (IE), electron affinity (EA), transport gap ( ), and interface dipole () as plotted in Fig. 2(b) for MnPc on Co and CuPc for comparison.

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/content/aip/journal/adva/3/6/10.1063/1.4812230
2013-06-19
2014-04-19

Abstract

The interface formation between manganese phthalocyanine (MnPc) and cobalt was investigated combining ultraviolet photoelectron spectroscopy and inverse photoelectron spectroscopy. The transport band gap of the MnPc increases with the film thickness up to a value of (1.2 ± 0.3) eV while the optical band gap as determined from spectroscopic ellipsometry amounts to 0.5 eV. The gap values are smaller compared to other phthalocyanines due to metallic Mn 3d states close to the Fermi level. The transport band gap was found to open upon air exposure as a result of the disappearance of the occupied 3d electronic states.

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Scitation: Influence of film thickness and air exposure on the transport gap of manganese phthalocyanine
http://aip.metastore.ingenta.com/content/aip/journal/adva/3/6/10.1063/1.4812230
10.1063/1.4812230
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