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Instruments / Technical Area	Publication Details	Published	Actions
I07-Surface & interface diffraction	Thickness-dependent energy-level alignment at the organic–organic interface induced by templated gap states Jan Hagenlocher , Katharina Broch , Matthias Zwadlo , Daniel Lepple , Jonathan Rawle , Francesco Carla , Satoshi Kera , Frank Schreiber , Alexander Hinderhofer Advanced Materials Interfaces 133 DOI: 10.1002/admi.202101382 Diamond Proposal Number(s): [18570] Open Access Show Abstract ▼ Abstract: Planar organic heterostructures are widely explored and employed in photovoltaic cells, light-emitting diodes, and bilayer field-effect transistors. An important role for device performance plays the energy level alignment at the inorganic–organic and organic–organic interfaces. In this work, incremental ultraviolet photoelectron spectroscopy measurements and real-time X-ray scattering experiments are used to thoroughly investigate the thickness-dependent electronic and structural properties of a perfluoropentacene (PFP)-on-[6]phenacene heterostructure. For both materials an incremental increase of the material work function (positive interface dipole) is found. For [6]phenacene, this can be assigned to a thickness-dependent change of molecular arrangement evident from a change of the unit cell volume and a consequential alteration of the ionization energy. In the case of PFP the interface dipole stems from charge transfer from the substrate into unoccupied molecular orbitals resulting in an electrostatic potential on the surface. The magnitude of this potential can be correlated with an increased gap state density resulting from templated structural defects mediated by the bottom layer.	Dec 2021

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I07-Surface & interface diffraction

Thickness-dependent energy-level alignment at the organic–organic interface induced by templated gap states

Jan Hagenlocher , Katharina Broch , Matthias Zwadlo , Daniel Lepple , Jonathan Rawle , Francesco Carla , Satoshi Kera , Frank Schreiber , Alexander Hinderhofer

Advanced Materials Interfaces 133

DOI: 10.1002/admi.202101382

Diamond Proposal Number(s): [18570]