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Electron depletion and accumulation regions in n-type copper-hexadecafluoro-phthalocyanine and their effects on electronic properties
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Figures

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FIG. 1.

(Color online) UPS spectra showing the secondary electron cutoff (left panels) and the HOMO region (right panels) near the Fermi level as a function of increasing coverage of (a) MoO3 and (b) PbO on F16CuPc. Zero binding energy corresponds to the Fermi level of the substrate.

Image of FIG. 2.

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FIG. 2.

Schematic energy level diagrams of (a) F16CuPc-MoO3 and (b) F16CuPc-PbO heterojunctions. All the values shown are in unit of eV.

Image of FIG. 3.

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FIG. 3.

(Color online) Transfer curves of the PbO/F16CuPc FETs (circle), the single-layer F16CuPc FET (square), and the MoO3/F16CuPc (triangle) at a drain voltage of 50 V.

Image of FIG. 4.

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FIG. 4.

(Color online) Transfer curves of a single layer CuPc FET and a PbO/CuPc heterojunction FET at a drain voltage of −50 V. A schematic energy level diagram of the F16CuPc-PbO heterojunction and the corresponding device structures are given in the insets. Hole depletion region was observed in CuPc layer.

Tables

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Table I.

Space charge regions in organic layers based on organic-inorganic heterojunctions and corresponding features.

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/content/aip/journal/apl/100/10/10.1063/1.3691257
2012-03-06
2014-04-25

Abstract

We investigated interfacial electronic structures of organic/inorganic heterojunctions formed between copper-hexadecafluoro-phthalocyanine (F16CuPc) and molybdenum trioxide or lead monoxide by ultraviolet and x-ray photoemission spectroscopies. Obvious energy level bending in F16CuPc shows the formation of electron depletion and accumulation regions in its contact with molybdenum and lead oxides, respectively. Effects of these depletion/accumulation zones were studied via electronic characteristics of field-effect transistors constructed with these heterojunctions as active layers. Finally, a summary about the heterojunction including organic semiconductor (n-type and p-type) and metal oxide was given, which demonstrated that organic semiconductors can form various space charge regions like conventional inorganic semiconductors.

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Scitation: Electron depletion and accumulation regions in n-type copper-hexadecafluoro-phthalocyanine and their effects on electronic properties
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/10/10.1063/1.3691257
10.1063/1.3691257
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