Interfacial electronic structure at a metal–phthalocyanine/graphene interface：Copper–phthalocyanine versus iron–phthalocyanine

doi:10.1088/1674-1056/22/11/117301

中国物理B ›› 2013, Vol. 22 ›› Issue (11): 117301-117301.doi: 10.1088/1674-1056/22/11/117301

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Interfacial electronic structure at a metal–phthalocyanine/graphene interface：Copper–phthalocyanine versus iron–phthalocyanine

叶伟国, 刘丹, 彭啸峰, 窦卫东

Physics Department, Shaoxing University, Shaoxing 312000, China

收稿日期:2013-06-20 修回日期:2013-07-16 出版日期:2013-09-28 发布日期:2013-09-28
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61106131), the Natural Science Foundation of Zhejiang Province, China (Grant No. Y6110072), the Talents Project of Science and Technology Department of Qianjiang City, China (Grant No. 2012R10075), and the Postdoctoral Science Foundation of China (Grant No. 2012M521119).

Interfacial electronic structure at a metal–phthalocyanine/graphene interface：Copper–phthalocyanine versus iron–phthalocyanine

Ye Wei-Guo (叶伟国), Liu Dan (刘丹), Peng Xiao-Feng (彭啸峰), Dou Wei-Dong (窦卫东)

Physics Department, Shaoxing University, Shaoxing 312000, China

Received:2013-06-20 Revised:2013-07-16 Online:2013-09-28 Published:2013-09-28
Contact: Dou Wei-Dong E-mail:phyth@usx.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61106131), the Natural Science Foundation of Zhejiang Province, China (Grant No. Y6110072), the Talents Project of Science and Technology Department of Qianjiang City, China (Grant No. 2012R10075), and the Postdoctoral Science Foundation of China (Grant No. 2012M521119).

摘要/Abstract

摘要： The energy level alignment of CuPc and FePc on single-layer graphene/Ni(111) (SLG/Ni) substrate was investigated by using ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS). The highest occupied molecular orbitals (HOMOs) in a thick layer of CuPc and FePc lie at 1.04 eV and 0.90 eV, respectively, below the Fermi level of the SLG/Ni substrate. Weak adsorbate–substrate interaction leads to negligible interfacial dipole at the CuPc/SLG/Ni interface, while a large interfacial dipole (0.20 eV) was observed in the case of FePc/SLG/Ni interface, due to strong adsorbate–substrate coupling. In addition, a new interfacial electronic feature was observed for the first time in the case of FePc on SLG/Ni substrate. This interfacial state can be attributed to a charge transfer from the SLG/Ni substrate to unoccupied orbitals of FePc.

关键词: interfacial electronic structure, metal–phthalocyanine interface, graphene, workfunction

Abstract: The energy level alignment of CuPc and FePc on single-layer graphene/Ni(111) (SLG/Ni) substrate was investigated by using ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS). The highest occupied molecular orbitals (HOMOs) in a thick layer of CuPc and FePc lie at 1.04 eV and 0.90 eV, respectively, below the Fermi level of the SLG/Ni substrate. Weak adsorbate–substrate interaction leads to negligible interfacial dipole at the CuPc/SLG/Ni interface, while a large interfacial dipole (0.20 eV) was observed in the case of FePc/SLG/Ni interface, due to strong adsorbate–substrate coupling. In addition, a new interfacial electronic feature was observed for the first time in the case of FePc on SLG/Ni substrate. This interfacial state can be attributed to a charge transfer from the SLG/Ni substrate to unoccupied orbitals of FePc.

Key words: interfacial electronic structure, metal–phthalocyanine interface, graphene, workfunction

中图分类号: (Electron states at surfaces and interfaces)

73.20.-r

73.30.+y (Surface double layers, Schottky barriers, and work functions) 73.22.Pr (Electronic structure of graphene)

叶伟国, 刘丹, 彭啸峰, 窦卫东. Interfacial electronic structure at a metal–phthalocyanine/graphene interface：Copper–phthalocyanine versus iron–phthalocyanine[J]. 中国物理B, 2013, 22(11): 117301-117301.

Ye Wei-Guo (叶伟国), Liu Dan (刘丹), Peng Xiao-Feng (彭啸峰), Dou Wei-Dong (窦卫东). Interfacial electronic structure at a metal–phthalocyanine/graphene interface：Copper–phthalocyanine versus iron–phthalocyanine[J]. Chin. Phys. B, 2013, 22(11): 117301-117301.

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Interfacial electronic structure at a metal–phthalocyanine/graphene interface：Copper–phthalocyanine versus iron–phthalocyanine

Interfacial electronic structure at a metal–phthalocyanine/graphene interface：Copper–phthalocyanine versus iron–phthalocyanine

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