Journal
ORGANIC ELECTRONICS
Volume 50, Issue -, Pages 264-272Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2017.07.037
Keywords
Bay-annulated indigo; Conjugated polymers; Nature-inspired dye; Organic photovoltaics; Renewable energy; Sustainability
Funding
- Research Foundation - Flanders (FWO Vlaanderen) [G.0415.14N, G.0B67.15N]
- Agency for Innovation by Science and Technology in Flanders (IWT)
- Brazilian National Council for Scientific and Technological Development (CNPq)
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Although research in the field of organic photovoltaics (OPV) still merely focuses on efficiency, efforts to increase the sustainability of the production process and the materials encompassing the device stack are of equally crucial importance to fulfil the promises of a truly renewable source of energy. In this study, a number of steps in this direction are taken. The photoactive polymers all contain an electron-deficient building block inspired on the natural indigo dye, bay-annulated indigo, combined with electron-rich thiophene and 4H-dithieno[3,2-b: 2',3'-d] pyrrole units. The synthetic protocol (starting from indigo) is optimized and the final materials are thoroughly analyzed. MALDI-TOF mass spectrometry provides detailed information on the structural composition of the polymers. Best solar cell efficiencies are obtained for polymer: fullerene blends spin-coated from a pristine non-halogenated solvent (o-xylene), which is highly recommended to reduce the ecological footprint of OPV and is imperative for large scale production and commercialization. (C) 2017 Elsevier B. V. All rights reserved.
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