Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.12: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Work-Function Modification of Transparent Conductive Electrodes and Investigation of Organic Electron-Transport-Layers for Use in Perovskite Solar Cells — •Berthold Wegner1,2, Federico Pulvirenti3, Jay Patel4, Nakita Noel4, Henry Snaith4, Seth Marder3, and Norbert Koch1,2 — 1Helmholtz-Zentrum Berlin, Germany — 2Humboldt-Universität zu Berlin, Germany — 3Georgia Institute of Technology, Atlanta, USA — 4University of Oxford, UK
Minimizing electron-collection losses at the electron-selective contact in organic-inorganic halide perovskite solar cells is crucial to achieve better device performance and long-term stability. Here, we report on the modification of fluorinated tin oxide (FTO) used as transparent electrode in perovskite devices, and the comparison of two classes of organic semiconductors with similar electron affinities for their use as efficient electron-transport-layers (ETL) in perovskite solar cells. Ultraviolet photoelectron spectroscopy (UPS) reveals that deposition of a moderately air-stable organometallic dimer on the FTO surface leads to a decrease in work-function (WF) by more than 1 eV. Furthermore, UPS and x-ray photoelectron spectroscopy (XPS) are used to study the energy level alignment between the dimer-modified FTO and the ETL layers, and whether the dimer reacts with or diffuses into the ETL layer. Perovskite solar cells employing such modified electron-selective contacts were fabricated showing increased power conversion efficiencies.