Daniel Ayuk Mbi Egbe
1. African Network for Solar Energy, Schillerstr. 5, 07745 Jena, Germany
2. Institute of Polymeric Materials and Testing, Johannes Kepler University Linz, Linz, Austria
3. Department of Chemistry, Material Science, Innovation and Modelling Research Focus Area, North-West University, Mafikeng. Private Bag X2046, Mmabatho 2745, South Africa.
4. College of Science and Technology, University of Rwanda, KN 7 Ave, P.O. Box 3900, Kigali, Rwanda.
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Since the discovery of electrical conductivity in doped polyacetylene by Shirakawa et al. , enormous progress has been achieved in the design, synthesis and detailed studies of the properties and applications of -conjugated polymers. The first part of this lecture will focus on the various chemical synthetic approaches which have led to efficient materials for organic solar cells, such as lowering the material energy band gap, or broadening the material absorption spectra, or adjusting the donor material HOMO and LUMO energy levels to those of the widely used acceptor materials PC60BM and PC70BM, or designing of compatible non-fullerene acceptor (NFA) materials, etc..
In the second part of the lecture, the focus will be directed on anthracene-based poly(arylene-ethynylene)-alt-poly(arylene-vinylene)s, PAE-PAVs, a new class of conjugated materials combining the interesting intrinsic properties of both poly(arylene-ethynylene)s (PAEs) and poly(arylene-vinylene)s (PAVs) in addition to structure-specific features . With these materials, we were able to demonstrate that by systematic variation of the nature (linear and/or branched), number and position of the laterally grafted alkoxy side chains and by fine tuning of the molecular-weight parameters, efficient photoactive polymers have been synthesized, which have exhibited state-of-the-art solar cells efficiencies of PPV-based materials and have served as basis in the gaining of valuable insights on the nanomorphology of solar cells active layers .
Keywords: Conjugated polymers, synthesis, band gap tuning, organic solar cells
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