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arXiv 1602.08885cond-mat.mtrl-sci
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F16CoPc/rubrene界面上的电荷转移、类带输运和磁性离子

Charge transfer, band-like transport, and magnetic ions at F16CoPc/rubrene interfaces

Yulia Krupskaya, Florian Rückerl, Martin Knupfer, Alberto F. Morpurgo

摘要:

有机半导体为控制界面电子系统的电子态提供了前所未有的灵活性。在这里,我们提出了实现有机电荷转移界面,结合了大的电导率和磁性离子的存在下的第一步。我们用变温电荷输运测量、霍尔效应、扫描开尔文探针显微镜和光电子能谱学等方法对F_(16)CoPc/红荧烯界面进行了详细的研究。我们的发现是,电荷转移导致显着增强的电导率和带状输运。我们测定了系统中载流子的密度、迁移率和性质(红荧烯中的空穴)。我们还发现,在F16 CoPc/红荧烯中的电荷转移量足够高,导致红荧烯晶体中的带状输运在界面处。最后,我们的XPS和UPS测量表明,在F16 CoPc/红荧烯的电荷转移涉及的酞菁分子的磁性Co离子的电子轨道为中心,导致其自旋的变化。因此,F16 CoPc/红荧烯是第一个有机界面,其中负责界面导电性的电荷转移完全涉及酞菁分子的金属Co核,提供了电荷传输和磁性之间的联系。

英文摘要:

Organic semiconductors offer an unprecedented flexibility to control the electronic state of interfacial electronic systems. Here we present a first step in realizing organic charge transfer interfaces that combine both a large electrical conductivity and the presence of magnetic ions. We have performed a detailed investigation of F16CoPc/rubrene interface by means of temperature dependent charge transport measurements, Hall effect, scanning Kelvin probe microscopy and photoelectron spectroscopy. Our finding is that the charge transfer leads to significantly enhanced electrical conductivity and the band-like transport. We have determined the density, mobility and nature of charge carriers in the system (holes in rubrene). We have also found that the amount of charge transfer in F16CoPc/rubrene is high enough to cause the band-like transport in rubrene crystals at the interface. Finally, our XPS and UPS measurements have shown that the charge transfer in F16CoPc/rubrene involves electronic orbitals centered on the magnetic Co ions of the phthalocyanine molecules causing a change in their spin. Thus, F16CoPc/rubrene is the first organic interface where the charge transfer responsible for the interfacial conductivity fully involves the metal Co core of the phthalocyanine molecules, providing a link between charge transport and magnetic properties.

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