Matrix Organization and Merit Factor Evaluation as a Method to Address the Challenge of Finding a Polymer Material for Roll Coated Polymer Solar Cells

Eva Bundgaard, Francesco Livi, Ole Hagemann, Jon Eggert Carlé, Martin Helgesen, Ilona Maria Heckler, Natalia Klaudia Zawacka, Dechan Angmo, Thue Trofod Larsen-Olsen, Gisele Alves dos Reis Benatto, Bérenger Roth, Morten Vesterager Madsen, Mats Andersson, Mikkel Jørgensen, Roar R. Søndergaard, Frederik C Krebs

Research output: Contribution to journalJournal articleResearchpeer-review


The results presented demonstrate how the screening of 104 light-absorbing low band gap polymers for suitability in roll coated polymer solar cells can be accomplished through rational synthesis according to a matrix where 8 donor and 13 acceptor units are organized in rows and columns. Synthesis of all the polymers corresponding to all combinations of donor and acceptor units is followed by characterization of all the materials with respect to molecular weight, electrochemical energy levels, band gaps, photochemical stability, carrier mobility, and photovoltaic parameters. The photovoltaic evaluation is carried out with specific reference to scalable manufacture, which includes large area (1 cm 2 ), stable inverted device architecture, an indium-tin-oxide-free fully printed flexible front electrode with ZnO/PEDOT:PSS (poly(3,4-ethylenedioxythiophene):polystyrene sulfonate), and a printed silver comb back electrode structure. The matrix organization enables fast identification of active layer materials according to a weighted merit factor that includes more than simply the power conversion efficiency and is used as a method to identify the lead candidates. Based on several characteristics included in the merit factor, it is found that 13 out of the 104 synthesized polymers outperformed poly(3-hexylthiophene) under the chosen processing conditions and thus can be suitable for further development.
Original languageEnglish
Article number1402186
JournalAdvanced Energy Materials
Issue number10
Number of pages16
Publication statusPublished - 2015

Bibliographical note

This work was supported by the Villum Foundation’s Young Investigator Programme (2nd round, project: Materials for Energy Production). Partial financial support was also received from the Eurotech Universities Alliance project “Interface science for photovoltaic (ISPV),” the EUIndian framework of the ‘‘Largecells’’ project that received funding from the European Commission's Seventh Framework Programme (FP7/2007–2013. Grant No. 261936), the European Commission as part of the Framework 7 ICT 2009 collaborative project ROTROT (Grant No. 288565), (Project No. 10728), the EUDP ( 64012-0202), and the Danish National Research Foundation in the project “Danish Chinese Center for organic based solar cells with morphological control.”

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