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Tuning the interfacial hole injection barrier between p-type organic materials and Co using a MoO3 buffer layer
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10.1063/1.4740455
/content/aip/journal/jap/112/3/10.1063/1.4740455
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/3/10.1063/1.4740455
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Chemical structures for (a) CuPc and (b) pentacene molecules in the bulk. To the right of the schematics are the corresponding molecular energy level diagrams. HOMO and LUMO represent the highest occupied molecular orbital and lowest unoccupied molecular orbital.

Image of FIG. 2.
FIG. 2.

(a) and (b) The evolution of secondary electron cutoff and valence band spectra as a function of CuPc thickness on the Co substrate.

Image of FIG. 3.
FIG. 3.

(a) and (b) The evolution of secondary electron cutoff and valence band spectra as a function of CuPc thickness on 4.0 nm MoO3/Co substrate. (c) A close-up of the near EF region of the valence band spectra.

Image of FIG. 4.
FIG. 4.

(a) and (b) The evolution of secondary electron cutoff and valence band spectra as a function of CuPc thickness on 2.0 nm MoO3/Co substrate.

Image of FIG. 5.
FIG. 5.

The energy level alignment diagrams for (a) CuPc/Co, (b) CuPc/4.0 nm MoO3/Co, and (c) CuPc/2.0 nm MoO3/Co.

Image of FIG. 6.
FIG. 6.

(a) The electronic structure of 4.0 nm MoO3/Co substrate (left), 2.0 nm MoO3/Co substrate (right), and CuPc (middle), before bringing CuPc molecules in contact with substrate. (b) The energy level alignment diagrams at the interface between CuPc and 4.0 nm MoO3/Co substrate and 2.0 nm MoO3/Co after the formation of CuPc film on each substrate.

Image of FIG. 7.
FIG. 7.

(a) and (b) The evolution of secondary electron cutoff and valence band spectra as a function of pentacene thickness on the Co substrate.

Image of FIG. 8.
FIG. 8.

(a) and (b) The evolution of secondary electron cutoff and valence band spectra as a function of pentacene thickness on 4.0 nm MoO3/Co substrate.

Image of FIG. 9.
FIG. 9.

(a) and (b) The evolution of secondary electron cutoff and valence band spectra as a function of pentacene thickness on 2.0 nm MoO3/Co substrate.

Image of FIG. 10.
FIG. 10.

(a) The energy level alignment diagrams for pentacene/Co interface. (b) Illustration of charge transfer mechanism between pentacene molecules and 4.0 nm MoO3/Co substrate, 2.0 nm MoO3/Co substrate based on the ICT model. The left and right part of (b) shows the energy level alignment between pentacene and MoO3/Co substrates before and after bringing pentacene molecules in contact with substrates, respectively.

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/content/aip/journal/jap/112/3/10.1063/1.4740455
2012-08-02
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tuning the interfacial hole injection barrier between p-type organic materials and Co using a MoO3 buffer layer
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/3/10.1063/1.4740455
10.1063/1.4740455
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