DataVXAdvanced SciencePaper
journal article·2018-02Open access

Increasing Photovoltaic Performance of an Organic Cationic Chromophore by Anion Exchange

Donatas Gesevičius, Antonia Neels, Sandra Jenatsch, Erwin Hack, Lucas Viani, Stavros Athanasopoulos, Frank Nüesch, Jakob Heier

Advanced Science· Volume 5· Issue 2
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Abstract

Abstract A symmetrical cyanine dye chromophore is modified with different counteranions to study the effect on crystal packing, polarizability, thermal stability, optical properties, light absorbing layer morphology, and organic photovoltaic (OPV) device parameters. Four sulfonate‐based anions and the bulky bistriflylimide anion are introduced to the 2‐[5‐(1,3‐dihydro‐1,3,3‐trimethyl‐2H‐indol‐2‐ylidene)‐1,3‐pentadien‐1‐yl]‐1,3,3‐trimethyl‐3H‐indolium chromophore using an Amberlyst A26 (OH − form) anion exchanger. Anionic charge distribution clearly correlates with device performance, whereby an average efficiency of 2% was reached in a standard bilayer organic solar. Evidence is given that the negative charge of the anion distributed over a large number of atoms is significantly more important than the size of the organic moieties of the sulfonate charge carrying group. This provides a clear strategy for future design of more efficient cyanine dyes for OPV applications.
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Research context

Electronic materials

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Luminescence and Fluorescent Materials

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

Affiliations

Laboratory for Functional Polymers Swiss Federal Laboratories for Materials Science and Technology, Empa Überlandstrasse 129 8600 Dübendorf Switzerland

Institute of Chemical Sciences and Engineering, ISIC Ecole Polytechnique Fédérale de Lausanne, EPFL Station 6 CH‐1015 Lausanne Switzerland

Center for X‐ray Analytics Swiss Federal Laboratories for Materials Science and Technology, Empa Überlandstrasse 129 8600 Dübendorf Switzerland

Laboratory for Transport at Nanoscale Interfaces Swiss Federal Laboratories for Materials Science and Technology, Empa Überlandstrasse 129 8600 Dübendorf Switzerland

Institute for Fluid Dynamics Nanoscience and Industrial Mathematics Universidad Carlos III de Madrid Avenida Universidad 30 28911 Leganés Madrid Spain

Departamento de Física Universidad Carlos III de Madrid Avenida Universidad 30 28911 Leganés Madrid Spain

Institut des Matériaux Ecole Polytechnique Fédérale de Lausanne, EPFL Station 6 CH‐1015 Lausanne Switzerland

Funding

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung · Universidad Carlos III de Madrid · Seventh Framework Programme

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