DataVXACS NanoPaper
journal article·2013-08-27

Understanding Energy-Level Alignment in Donor–Acceptor/Metal Interfaces from Core-Level Shifts

Afaf El-Sayed, Patrizia Borghetti, Elizabeth Goiri, Celia Rogero, Luca Floreano, Giacomo Lovat, Duncan John Mowbray, Jose Luis Cabellos, Yutaka Wakayama, Angel Rubio, Jose Enrique Ortega, Dimas G. de Oteyza

ACS Nano· Volume 7· Issue 8
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Source abstract

Abstract

The molecule/metal interface is the key element in charge injection devices. It can be generally defined by a monolayer-thick blend of donor and/or acceptor molecules in contact with a metal surface. Energy barriers for electron and hole injection are determined by the offset from HOMO (highest occupied) and LUMO (lowest unoccupied) molecular levels of this contact layer with respect to the Fermi level of the metal electrode. However, the HOMO and LUMO alignment is not easy to elucidate in complex multicomponent, molecule/metal systems. We demonstrate that core-level photoemission from donor-acceptor/metal interfaces can be used to straightforwardly and transparently assess molecular-level alignment. Systematic experiments in a variety of systems show characteristic binding energy shifts in core levels as a function of molecular donor/acceptor ratio, irrespective of the molecule or the metal. Such shifts reveal how the level alignment at the molecule/metal interface varies as a function of the donor-acceptor stoichiometry in the contact blend.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Molecular Junctions and Nanostructures · Surface Chemistry and Catalysis · Surface and Thin Film Phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departamento Fisica Aplicada I, Universidad del Pais Vasco UPV/EHU, E-20018 San Sebastian, Spain

Donostia International Physics Center, Paseo Manuel Lardizabal 4, E-20018 San Sebastian, Spain

Centro de Fisica de Materiales CSIC/UPV-EHU-Materials Physics Center, E-20018 San Sebastian, Spain

CNR-IOM, Laboratorio Nazionale TASC, Basovizza SS-14 Km. 163.5, I-34149, Trieste, Italy

Nano-Bio Spectroscopy Group and ETSF Scientific Development Center, Departamento de Fisica de Materiales, Universidad del Pais Vasco UPV/EHU, Avenida de Tolosa 7, E-20018 San Sebastian, Spain

International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

Department of Physics, University of California, Berkeley, California 94720, United States

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