Charge Conduction Properties at the Contact Interface between (Phthalocyaninato)nickel(II) and Electron Acceptor Single Crystals

Takahashi, Yukihiro; Hayakawa, Katsuyuki; Takayama, Katsuya; Yokokura, Seiya; Harada, Jun; Hasegawa, Hiroyuki; Inabe, Tamotsu

doi:10.1021/cm403033b

Cited by 24 publications

(31 citation statements)

References 21 publications

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“…With the exception of TTF‐TCNQ, the interfacial hole density in F 16 CoPc/rubrene is the highest among all studied organic charge transfer interfaces . The fact that the obtained value is higher than the one of F 4 ‐TCNQ/rubrene interface (1.0 × 10 13 cm −2 ), while the mobility values are very similar (F x ‐TCNQ/rubrene interfaces: μ ≈ 1.5 cm 2 V −1 s −1 ), is consistent with the lower resistivity of F 16 CoPc/rubrene.…”

supporting

confidence: 77%

“…The phenomenon of charge transfer in molecular materials is of a particular interest both in fundamental and applied research in the field of organic electronics . Especially when considering interfaces formed by two different organic semiconductors, charge transfer from one semiconductor to the other can have dramatic effects and lead to interfacial electronic properties that differ drastically from the properties of the individual constituent materials . Indeed, the interfaces between two large‐gaps, initially insulating organic semiconductors can exhibit significantly enhanced electrical conductivity and in some cases even metallic behavior, as it has been observed in interfaces formed by single crystals of TTF (tetrathiofulvalene) and TCNQ (tetracyanoquinodimethane) .…”

mentioning

confidence: 99%

“…At the current stage, with no previous experiments reported, our work aims at identifying promising combinations of different molecular materials enabling the experimental realization of magnetic and conducting organic interfaces. This is essential because so far the number of conducting organic interfaces that have been investigated experimentally is limited, in no cases involving magnetic ions, and among all systems studied, only one was found to exhibit metallic interfacial electrical conductivity …”

mentioning

confidence: 99%

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Charge Transfer, Band‐Like Transport, and Magnetic Ions at F₁₆CoPc/Rubrene Interfaces

Krupskaya

Rückerl

Knupfer

et al. 2016

Adv Materials Inter

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and among all systems studied, only one was found to exhibit metallic interfacial electrical conductivity. [ 5 ] We investigate heterostructures formed by a rubrene (tetraphenyltetracene) single crystal and an F 16 CoPc (fl uorinated Co-phthalocyanine) fi lm by means of charge transport and photoelectron spectroscopy. We fi nd that the F 16 CoPc/rubrene interface has signifi cantly enhanced electrical conductance. With the exception of TTF/TCNQ, [ 5 ] the room temperature resistivity of this interface is the lowest reported so far, and temperature dependent measurements show a decrease of the resistivity upon cooling (down to ≈130 K) indicating the occurrence of band-like transport. [20][21][22][23][24][25][26][27][28][29][30] By means of Hall effect measurements, we establish that charge transport is dominated by holes in the rubrene crystal and we fi nd that the value of the hole mobility virtually coincides with that measured in a class of recently investigated organic interfaces based on F x -TCNQ (fl uorinated tetracyanoquinodimethane) and rubrene single crystals. [ 13 ] As compared to all interfaces studied in this family, on the contrary, the hole density is higher in F 16 CoPc/rubrene, which explains the low value of the F 16 CoPc/rubrene resistivity. The results of the transport measurements are corroborated by Kelvin probe microscopy experiments that enable the alignment of the chemical potential across the F 16 CoPc/rubrene interface to be determined, and confi rm that a large transfer between the two materials should be expected. Finally, we perform photoelectron spectroscopy (PES) measurements on thin fi lm F 16 CoPc/rubrene heterostructures to show that the charge transfer at the interface involves electronic orbitals centered on the magnetic Cobalt ion of the F 16 CoPc molecules. We therefore conclude that the investigated system does allow the high electrical conductivity with the presence of magnetic ions to be combined at the interface.F 16 CoPc/rubrene interface devices were formed on a polydimethylsiloxane substrate. First, a rubrene single crystal (grown by physical vapor transport) was laminated on the substrate and then a 70-nm F 16 CoPc fi lm was evaporated (under high vacuum conditions) on top of the rubrene crystal. The transport properties of rubrene single crystals (identical to those used to assemble the interfaces) were investigated via fi eldeffect transistor (FET) measurements [ 31 ] as a characterization step, and showed a room temperature mobility between 12 and 20 cm 2 V −1 s −1 in devices in which the crystal was suspended on top of a gate electrode, in agreement with previous studies. [32][33][34] In order to maintain its quality, the rubrene crystal was kept at room temperature throughout the deposition of the evaporated fi lm. As a result, the morphology of the F 16 CoPc fi lm was expected to be far from ideal, as indeed indicated by atomic force microscopy measurements showing F 16 CoPc fi lms with rather rough surfaces, consisting of small grains with irregular orientation...

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supporting

confidence: 77%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Charge Transfer, Band‐Like Transport, and Magnetic Ions at F₁₆CoPc/Rubrene Interfaces

Krupskaya

Rückerl

Knupfer

et al. 2016

Adv Materials Inter

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“…Also, charge transfer at interfaces of two molecular materials came into the focus of researchers triggered by the goal to advance the performance of organic electronic devices, or by the possibility for functionalities at such interfaces. Intriguingly, interfaces between two different organic semiconductors support charge transfer from one side to the other and resulted in electronic properties that differ substantially from those of the individual constituent materials . Even metallic behavior can occur at the interface of two initially insulating organic semiconductors .…”

Section: Introductionmentioning

confidence: 99%

Charge Transfer at the Interface Between MnPc and F₆TCNNQ

Waas

Rückerl

Knupfer

2018

Physica Status Solidi (b)

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Photoelectron spectroscopy in the core level as well as the valence band region has been used to determine the electronic properties of interfaces between manganese phthalocyanine (MnPc) and the strong electron acceptor F 6 TCNNQ. It is shown that charge transfer occurs at this interface which results in the oxidation (reduction) of MnPc (F 6 TCNNQ) at the interface. Our data indicate a full electron transfer with no evidence for hybrid states. The valence band data suggest that the interface remains insulating/semiconducting despite the charge transfer, which indicates localized charges.

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“…A second method to detect the charge transfer is a linear approach between neutral acceptor and fully ionized acceptor with charge of 1 e − comparing the wave numbers of the respective maximum. The wave number of the C≡N vibration for the fully ionized acceptor in alkaline salts is 2186 cm −1 for TCNQ −1 , 2188 cm −1 for TCNQ-F 2 −1 and 2190 cm −1 for TCNQ-F 4 −1 [32,34,31].…”

Section: Charge Transfer By Structural Data Analysis and Infrared Spementioning

confidence: 96%

Crystal growth of new charge-transfer salts based on π-conjugated donor molecules

Morherr

Witt

Chernenkaya

et al. 2016

Physica B: Condensed Matter

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New charge transfer crystals of π-conjugated, aromatic molecules (phenanthrene and picene) as donors were obtained by physical vapor transport. The melting behavior, optimization of crystal growth and the crystal structure is reported for charge transfer salts with (fluorinated) tetracyanoquinodimethane (TCNQ-F x , x=0, 2, 4), which was used as acceptor material. The crystal structures were determined by single-crystal X-ray diffraction. Growth conditions for different vapor pressures in closed ampules were applied and the effect of these starting conditions for crystal size and quality is reported. The process of charge transfer was investigated by geometrical analysis of the crystal structure and by infrared spectroscopy on single crystals. With these three different acceptor strengths and the two sets of donor materials, it is possible to investigate the distribution of the charge transfer systematically. This helps to understand the charge transfer process in this class of materials with π-conjugated donor molecules.

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Charge Conduction Properties at the Contact Interface between (Phthalocyaninato)nickel(II) and Electron Acceptor Single Crystals

Cited by 24 publications

References 21 publications

Charge Transfer, Band‐Like Transport, and Magnetic Ions at F₁₆CoPc/Rubrene Interfaces

Charge Transfer, Band‐Like Transport, and Magnetic Ions at F₁₆CoPc/Rubrene Interfaces

Charge Transfer at the Interface Between MnPc and F₆TCNNQ

Crystal growth of new charge-transfer salts based on π-conjugated donor molecules

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Charge Conduction Properties at the Contact Interface between (Phthalocyaninato)nickel(II) and Electron Acceptor Single Crystals

Cited by 24 publications

References 21 publications

Charge Transfer, Band‐Like Transport, and Magnetic Ions at F16CoPc/Rubrene Interfaces

Charge Transfer, Band‐Like Transport, and Magnetic Ions at F16CoPc/Rubrene Interfaces

Charge Transfer at the Interface Between MnPc and F6TCNNQ

Crystal growth of new charge-transfer salts based on π-conjugated donor molecules

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Charge Transfer, Band‐Like Transport, and Magnetic Ions at F₁₆CoPc/Rubrene Interfaces

Charge Transfer, Band‐Like Transport, and Magnetic Ions at F₁₆CoPc/Rubrene Interfaces

Charge Transfer at the Interface Between MnPc and F₆TCNNQ