DataVXChemistry of MaterialsPaper
journal article·2016-12-27Open access

Elucidating Batch-to-Batch Variation Caused by Homocoupled Side Products in Solution-Processable Organic Solar Cells

Tim Vangerven, Pieter Verstappen, Nilesh Patil, Jan D’Haen, Ilaria Cardinaletti, Johannes Benduhn, Niko Van den Brande, Maxime Defour, Vincent Lemaur, David Beljonne, Roberto Lazzaroni, Benoit Champagne, Koen Vandewal, Jens W. Andreasen, Peter Adriaensens, Dag W. Breiby, Bruno Van Mele, Dirk Vanderzande, Wouter Maes, Jean Manca

Chemistry of Materials· Volume 28· Issue 24
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Source abstract

Abstract

Conjugated polymers and small molecules based on alternating electron-donating (D) and electron-accepting (A) building blocks have led to state-of-the-art organic solar cell materials governing efficiencies beyond 10%. Unfortunately, the connection of D and A building blocks via cross-coupling reactions does not always proceed as planned, which can result in the generation of side products containing D-D or A-A homocoupling motifs. Previous studies have reported a reduced performance in polymer and small molecule solar cells when such defect structures are present. A general consensus on the impact of homocouplings on device performance is, however, still lacking as is a profound understanding of the underlying causes of the device deterioration. For differentiating the combined effect of molecular weight and homocouplings in polymer solar cells, a systematic study on a small molecule system (DTS(FBBTh 2 ) 2 ) is presented. The impact of homocouplings on nanomorphology, thermal, and electro-optical properties is investigated. It is demonstrated that small quantities of homocouplings (<10%) already lead to suboptimal device performance, as this strongly impacts the molecular packing and electronic properties of the photoactive layer. These results highlight the importance of material purity and pinpoint homocoupling defects as one of the most probable reasons for batch-to-batch variations.
Source: openalex_inverted_index · Quality: baseline

Research context

PolymersNanomaterials

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Thin-Film Transistor Technologies

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

Affiliations

Material Physics Division, Institute for Materials Research (IMO-IMOMEC), Hasselt University, Universitaire Campus, Wetenschapspark 1, 3590 Diepenbeek, Belgium

Design & Synthesis of Organic Semiconductors (DSOS)/Nuclear Magnetic Resonance Spectroscopy Group (NMR), Institute for Materials Research (IMO-IMOMEC), Hasselt University, Universitaire Campus, Agoralaan 1, 3590 Diepenbeek, Belgium

Department of Physics, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, 7491 Trondheim, Norway

Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, George-Bähr-Straße 1, 01069 Dresden, Germany

Physical Chemistry and Polymer Science, Materials and Chemistry, Faculty of Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium

Laboratory for Chemistry of Novel Materials, Université de Mons (UMONS), Place du Parc 20, 7000 Mons, Belgium

Department of Chemistry, Université de Namur (UNamur), Rue de Bruxelles 61, 5000 Namur, Belgium

Department of Energy Conversion and Storage, Technical University of Denmark (DTU), Frederiksborgvej 399, PO Box 49, 4000 Roskilde, Denmark

Imec vzw, Division IMOMEC, Universitaire Campus, Wetenschapspark 1, 3590 Diepenbeek, Belgium

X-LaB, Hasselt University, Universitaire Campus, Agoralaan 1, B-3590 Diepenbeek, Belgium

Funding

Bundesministerium für Bildung und Forschung · European Regional Development Fund · Federaal Wetenschapsbeleid · Fonds Wetenschappelijk Onderzoek · Agentschap voor Innovatie door Wetenschap en Technologie · Fonds De La Recherche Scientifique - FNRS · H2020 European Research Council · Région Wallonne

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