Interface properties of CoPc and CoPcF16 on graphene/nickel: influence of germanium intercalation

被引：3

作者：

Balle, David ^{[1
]}

Schedel, Christine ^{[1
]}

Chasse, Thomas ^{[1
]}

Peisert, Heiko ^{[1
]}

机构：

[1] Univ Tubingen, Inst Phys & Theoret Chem, Morgenstelle 18, D-72076 Tubingen, Germany

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2019年 / 31卷 / 17期

关键词：

phthalocyanines; interfaces; photoemission; graphene; germanium intercalation; ENERGY-LEVEL ALIGNMENT; FIELD-EFFECT TRANSISTORS; CHARGE-TRANSFER; ELECTRONIC-STRUCTURE; ORGANIC/METAL INTERFACES; AUGER PARAMETER; PHTHALOCYANINE; METAL; PHOTOEMISSION; POLARIZATION;

D O I：

10.1088/1361-648X/ab028f

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Photoelectron spectroscopy was used to investigate electronic interface properties and interactions of the organic semiconductors CoPc and CoPcF16 on graphene/nickel based substrates. Additional focus was put on the influence of germanium intercalation of graphene/nickel. The presented results demonstrate that germanium can decouple graphene from nickel and in this manner restore its buffer layer properties. No charge transfer from the substrate to the organic layer is observed in the germanium intercalated case, while interface related peaks in the Co 2p core level spectra indicate such charge transfer on graphene/nickel. Strong interface dipoles are found for CoPcF16 on graphene/nickel and on germanium intercalated graphene/nickel. Fluorine Auger parameters have been measured, and the results provide evidence for polarization and charge transfer screening effects of different amounts at the unlike film-substrate interfaces. The various contributions to the observed shifts are discussed.

引用

页数：12

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