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

Author

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

Published
2016
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8. Elucidating Batch-to-Batch Variation Caused by Homocoupled Side Products in Solution-Processable Organic Solar Cells

Author

David Beljonne, Vincent Lemaur, Ilaria Cardinaletti, Dag W. Breiby, Bruno Van Mele, Johannes Benduhn, Jan D'Haen, Jean Manca, Wouter Maes, Roberto Lazzaroni, Nilesh Patil, Maxime Defour, Peter Adriaensens, Dirk Vanderzande, Benoît Champagne, Tim Vangerven, Koen Vandewal, Pieter Verstappen, Niko Van den Brande, Jens Wenzel Andreasen, VANGERVEN, Tim, VERSTAPPEN, Pieter, Patil, Nilesh, D'HAEN, Jan, CARDINALETTI, Ilaria, Benduhn, Johannes, Van den Brande, Niko, Defour, Maxime, Lemaur, Vincent, Beljonne, David, Lazzaroni, Roberto, Champagne, Benoît, VANDEWAL, Koen, Andreasen, Jens W., ADRIAENSENS, Peter, Breiby, D.B., Van Mele, Bruno, VANDERZANDE, Dirk, MAES, Wouter, MANCA, Jean, Materials and Chemistry, Physical Chemistry and Polymer Science, Faculty of Engineering, and Faculty of Economic and Social Sciences and Solvay Business School

Subjects
chemistry.chemical_classification, Materials science, Organic solar cell, General Chemical Engineering, Nanotechnology, 02 engineering and technology, General Chemistry, Polymer, Conjugated system, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Small molecule, Chemical reaction, Polymer solar cell, 0104 chemical sciences, Chemical engineering, chemistry, Thermal, Materials Chemistry, Molecule, 0210 nano-technology
Abstract

Conjugated polymers and small molecules based on alternating electron-donating (D) and electronaccepting (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(FBBTh2)2) is presented. The impact of homocouplings on nanomorphology, thermal, and electro-optical properties is investigated. It is demonstrated that small quantities of homocouplings (

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