Doping of C60 sub monolayers by Fermi level pinning induced electron transfer

  title={Doping of C60 sub monolayers by Fermi level pinning induced electron transfer},
  author={Jens Niederhausen and Patrick Amsalem and Andreas Wilke and Raphael Schlesinger and Stefanie Winkler and Antje Vollmer and J{\"u}rgen P. Rabe and Norbert Koch},
  journal={Physical Review B},
Fermi-level pinning of C60 (sub)-monolayers on a sexithiophene (6T) bilayer grown on Ag(111) is shown to induce electron transfer from the metal to a fraction of the C60 molecules. The electrostatic potential resulting from the charge transfer process is responsible for a potential drop within the 6T interlayer and, more remarkably, for dipole-dipole repulsion, leading to a disproportionation into coexisting neutral and charged C60 molecules. We suggest that charge ordering phenomena may occur… Expand
40 Citations

Figures from this paper

Fermi level pinning induced electrostatic fields and band bending at organic heterojunctions
The energy level alignment at interfaces between organic semiconductors is of direct relevance to understand charge carrier generation and recombination in organic electronic devices. Commonly, workExpand
Role of charge transfer, dipole-dipole interactions, and electrostatics in Fermi-level pinning at a molecular heterojunction on a metal surface
Recently, Niederhausen et al. [Phys. Rev. B 86, 081411(R) (2012)] have reported on the energy level alignment of C${}_{60}$ adsorbed on a bilayer \ensuremath{\alpha}-sexithiophene (6T) film onExpand
Seleno groups control the energy-level alignment between conjugated organic molecules and metals.
X-ray and ultraviolet photoelectron spectroscopy data are presented that demonstrate that the interfacial energy-level alignment mechanism found for chalcogenol SAMs also applies to seleno-functionalized COMs, and can be exploited to mitigate the push-back effect at metal contacts. Expand
C60 chain phases on ZnPc/Ag(111) surfaces: Supramolecular organization driven by competing interactions.
A model based on competing van der Waals attractions and electrostatic repulsions between C60 molecules as an explanation for the driving force behind these monolayer phases is investigated. Expand
From high quality packing to disordered nucleation or phase separation in donor/acceptor interfaces: ClAlPc-C60 on Au(111).
The present results contribute to understanding the influence of the dipolar nature of molecular layers on the electronic and structure of donor/acceptor heterojunctions, which is crucial for device design via engineering the energy level alignment at organic-organic and organic-metal interfaces. Expand
Molecular Orientation-Dependent Interfacial Energetics and Built-in Voltage Tuned by a Template Graphene Monolayer
Highly transparent and conductive monolayer graphene was used as a template to tune the crystal orientation of pentacene from generic standing-up (001) to lying-down (022) in neat films. SpatiallyExpand
Organic semiconductor density of states controls the energy level alignment at electrode interfaces
The shape and the energy distribution of electronic states tailing into the fundamental gap is found to determine both the minimum value of practically achievable injection barriers as well as their spatial profile, ranging from abrupt interface dipoles to extended band-bending regions. Expand
Band-bending in organic semiconductors: the role of alkali-halide interlayers.
Metal-to-organic charge transfer through the insulator, rather than doping of the organic by alkali-metal ions, is identified as the origin of the observed band-bending, which is in contrast to the localized interface dipole occurring without the insulating buffer layer. Expand
From Chiral Islands to Smectic Layers: A Computational Journey Across Sexithiophene Morphologies on C60
A theoretical investigation of the molecular organization at a sexithiophene (T6)-C60 fullerene planar heterojunction, based on atomistic molecular dynamics, is presented, in which the effect of twoExpand
Modulation of the Work Function by the Atomic Structure of Strong Organic Electron Acceptors on H‐Si(111)
Advances in hybrid organic/inorganic architectures for optoelectronics can be achieved by understanding how the atomic and electronic degrees of freedom cooperate or compete to yield the desiredExpand


Electric fields induced by energy level pinning at organic heterojunctions
We investigated the energy levels at organic heterojunctions comprising the donor diindenoperylene (DIP) on top of the acceptor C60 with photoelectron spectroscopy. The intermolecular interaction isExpand
Metal-to-Acceptor Charge Transfer through a Molecular Spacer Layer
We investigate how the thermodynamic equilibrium is reached when a strong electron acceptor molecule (hexaaza-triphenylene-hexacarbonitrile, HATCN) is deposited on Ag(111) precovered with aExpand
Energy level alignment between sexithiophene and buckminsterfullerene films
Ultraviolet photoelectron spectroscopy has been used to investigate the interface between thermally deposited α-sexithiophene (6T) and buckminsterfullerene (C60) films on gold surfaces. ChargeExpand
Optimized hole injection with strong electron acceptors at organic-metal interfaces.
The energy-level alignment at interfaces between three electroactive conjugated organic materials and Au was systematically varied by adjusting the precoverage of the metal substrate with theExpand
Understanding the Electronic Structure of Metal/SAM/Organic−Semiconductor Heterojunctions
Surprisingly, although in most cases the pinning occurs only when the metal is present, it is not related to charge transfer between the electrode and the organic layer, and charge rearrangements at the interface between the SAM and the OSC are observed. Expand
Energy level alignment and interface states at α-sexithiophene/Ag interfaces
Abstract We present a combined X-ray and ultraviolet photoemission study of the interface between the thiophene based organic semiconductor α-sexithiophene (6T) and silver. Thermally evaporatedExpand
Modulation of surface charge transfer through competing long-range repulsive versus short-range attractive interactions
We report a combined experimental and theoretical study of the modulation of surface charge transfer on the tetrathiafulvalene (TTF)/Au(111) interface as a function of coverage in the submonolayerExpand
Reversible phase transformation and doubly charged anions at the surface of simple cubic RbC60.
The simple cubic phase of a RbC60 thin film has been studied using photoelectron spectroscopy and a molecular charge state is identified in the valence band and core-level photoemission spectra which arises from C60(2-) anions and contributes to the spectral intensity at the Fermi level. Expand
Vacuum level alignment at organic/metal junctions: “Cushion” effect and the interface dipole
The electronic level alignment of various organic molecules on metal surfaces has been determined by a combined experimental and theoretical effort. Using ab initio electronic structure calculations,Expand
Second-layer induced island morphologies in thin-film growth of fullerenes.
A kinetic growth model is developed that unravels the microscopic mechanisms of the structure formation of CaF(2)(111) islands and finds a smooth transition from compact, triangular islands to branched hexagonal islands upon lowering the temperature. Expand