Electronic structure, diffusion, and <i>p</i>-doping at the Au/F16CuPc interface

Shen, Chongfei; Kahn, Antoine

doi:10.1063/1.1406967

Cited by 116 publications

(63 citation statements)

References 13 publications

(19 reference statements)

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“…[26][27][28] The absence of complementary functional groups and dipolar moments in both DIP and F 16 CuPc limits the intermolecular interactions in single-component layers to weak van der Waals interactions and steric effects. In a first step, the respective film structures have been characterized by complementary STM and LEED measurements.…”

Section: Resultsmentioning

confidence: 99%

Balancing Intermolecular and Molecule–Substrate Interactions in Supramolecular Assemblies

Oteyza

Silanes

Ruiz-Oses

et al. 2009

Adv Funct Materials

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Self‐assembly of functional supra‐molecular nanostructures is among the most promising strategies for further development of organic electronics. However, a poor control of the interactions driving the assembling phenomena still hampers the tailored growth of designed structures. Here exploration of how non‐covalent molecule‐substrate interactions can be modified on a molecular level is described. For that, mixtures of DIP and F16CuPc, two molecules with donor and acceptor character, respectively are investigated. A detailed study of their structural and electronic properties is performed. In reference to the associated single‐component layers, the growth of binary layers results in films with strongly enhanced intermolecular interactions and consequently reduced molecule‐substrate interactions. This new insight into the interplay among the aforementioned interactions provides a novel strategy to balance the critical interactions in the assembly processes by the appropriate choice of molecular species in binary supra‐molecular assemblies, and thereby control the self‐assembly of functional organic nanostructures.

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Section: Resultsmentioning

confidence: 99%

Balancing Intermolecular and Molecule–Substrate Interactions in Supramolecular Assemblies

Oteyza

Silanes

Ruiz-Oses

et al. 2009

Adv Funct Materials

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“…The asymmetric characteristic of the undoped NTCDA device shows higher current density at high fields for top-contact injection, and is indicative of the formation of an inhomogeneous top contact. One possibility is that the threedimensional growth of NTCDA added to some interface diffusion of Au [20] results in the formation of sharp interface morphological features, which concentrate electric-field lines and enhance carrier injection from the top contact. In contrast, the current behavior of the doped device is uniform for both top and bottom injection.…”

Section: I-v Measurementsmentioning

confidence: 99%

Molecular n-Type Doping of 1,4,5,8-Naphthalene Tetracarboxylic Dianhydride by Pyronin B Studied Using Direct and Inverse Photoelectron Spectroscopies

et al. 2006

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Molecular n‐type doping of 1,4,5,8‐naphthalene tetracarboxylic dianhydride (NTCDA) by pyronin B (PyB) is investigated using ultraviolet photoelectron spectroscopy (UPS), inverse photoelectron spectroscopy (IPES), and current–voltage (I–V) measurements. Deposition of small amounts (< 2 Å) of PyB on pristine NTCDA films leads to a shift of all the molecular levels away from the Fermi level by nearly 0.20 eV, indicative of n‐type doping of NTCDA by PyB. Interface and bulk energy levels of films formed by co‐evaporation of host and dopant show similarly efficient n‐doping. The spectroscopic measurements are confirmed by I–V measurements, which show a four‐orders‐of‐magnitude increase in current in doped films. The comparison of data obtained from UPS of the neat PyB film with the results of density functional theory calculations confirm that two species of PyB are evaporated and condensed into the solid state, with one species primarily responsible for doping.

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“…[24] On the other hand, there is a new, 0.3 eV electron-injection barrier, due to the lowest unoccupied molecular orbital (LUMO) of F 16 CuPc (4.8 eV). [25] However, the injection barrier displays a strong dependence on the electric field, which can be reduced by increasing the gate and drain voltages in OFETs. In addition, the small injection barrier can also be overcome by charge tunneling.…”

Section: Introductionmentioning

confidence: 99%

Heterojunction Ambipolar Organic Transistors Fabricated by a Two-Step Vacuum-Deposition Process

et al. 2006

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Ambipolar organic field‐effect transistors (OFETs) are produced, based on organic heterojunctions fabricated by a two‐step vacuum‐deposition process. Copper phthalocyanine (CuPc) deposited at a high temperature (250 °C) acts as the first (p‐type component) layer, and hexadecafluorophthalocyaninatocopper (F16CuPc) deposited at room temperature (25 °C) acts as the second (n‐type component) layer. A heterojunction with an interpenetrating network is obtained as the active layer for the OFETs. These heterojunction devices display significant ambipolar charge transport with symmetric electron and hole mobilities of the order of 10–4 cm2 V–1 s–1 in air. Conductive channels are at the interface between the F16CuPc and CuPc domains in the interpenetrating networks. Electrons are transported in the F16CuPc regions, and holes in the CuPc regions. The molecular arrangement in the heterojunction is well ordered, resulting in a balance of the two carrier densities responsible for the ambipolar electrical characteristics. The thin‐film morphology of the organic heterojunction with its interpenetrating network structure can be controlled well by the vacuum‐deposition process. The structure of interpenetrating networks is similar to that of the bulk heterojunction used in organic photovoltaic cells, therefore, it may be helpful in understanding the process of charge collection in organic photovoltaic cells.

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Electronic structure, diffusion, and p-doping at the Au/F16CuPc interface

Abstract: Role of metal-molecule chemistry and interdiffusion on the electrical properties of an organic interface: The Al-F 16 CuPc case

Cited by 116 publications

References 13 publications

Balancing Intermolecular and Molecule–Substrate Interactions in Supramolecular Assemblies

Balancing Intermolecular and Molecule–Substrate Interactions in Supramolecular Assemblies

Molecular n-Type Doping of 1,4,5,8-Naphthalene Tetracarboxylic Dianhydride by Pyronin B Studied Using Direct and Inverse Photoelectron Spectroscopies

Heterojunction Ambipolar Organic Transistors Fabricated by a Two-Step Vacuum-Deposition Process

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