Project details


Research Topic B

B1 Charge-transporting polymers and dendrimers for OPV and OFET applications
DOT-KTU is involved in the development of various synthetic methods and techniques for the preparation of chargetransporting polymers. DOT-KTU developed the patented methods of anionic polymerization of oxiranes with electroactive substituents using potassium derivatives and crown-ethers or cryptands (Polish patent 306366). It was also involved in the development of the industrial method of synthesis of poly[9-(2,3-epoxypropyl)carbazole] by cationic and anionic polymerisations of the corresponding epoxy monomer. Recently, DOT-KTU has been gaining experience in the field of design, synthesis and characterisation of dendritic materials through its participation in the FP7 Marie Curie Initial Training Network project “Functional liquid crystal dendrimers: synthesis of new materials, resource for new applications”.

DOT-KTU uses modern techniques for characterisation of electroactive polymeric materials e.g., electron photoemission spectroscopy for estimation of ionization potentials, time-of-light method for estimation of charge carrier mobilities, luminescence spectrometry to explore photophysical characteristics. Such characterisation is of great importance in the efforts to improve organic electronic device efficiency (OFET, OPV), reduce energy payback time of OPV and decrease power consumption of OFET. Also, DOT-KTU has substantial experience in the synthesis and characterisation of new electroactive polymeric materials which have been successfully applied in the FP7 project “Dendreamers” and in other international collaborative projects.

However, in order to remain at the cutting-edge of synthesis and characterisation of polymeric semiconductors as well as in (opto)electronic device formation, DOT-KTU will need to upgrade some of its laboratory equipment (i.e. spincoating equipment, dielectric spectrometer).

Through the equipment upgrades and knowledge-exchange with twinning partners, the CEOSeR project will boost DOT-KTU’s capacity to design and synthesise multifunctional polymeric/dendritic materials for OPV/OFET applications. The multifunctional polymeric/dendritic materials will include:

> B1.1 Low-molar-mass electroactive building blocks’ which possess the necessary properties such as high charge mobilities, processability and solubility (see scheme below). This will require deeper understanding of ways to optimize the relationship between structure and photoelectrical properties (charge transport properties and ionization potentials).
> B1.2 Electroactive monomers for use in the synthesis of homopolymers (see scheme below) by modern synthetic approaches (controlled polymerization techniques - ATRP, ROMP, etc.) After the thorough characterization, the selected homopolymers will be used in the synthesis of multifunctional block copolymers. The special attention will be paid to the influence of the main chains on the physical, dielectrical and photoelectrical properties, p-p stacking, liquid crystallinity. Knowledge of the influence of block size/sequence on the device characteristics will be exchanged.

DOT-KTU is involved in the development of an approach to circumvent this problem by rendering the material insoluble using cross-linking reactions. Up to now, mainly cationically photo-cross-linkable hole-transporting molecules have been reported in international research papers. Consequently, via the CEOSeR project, DOT-KTU aims to develop its capacity to render materials insoluble using cross-linking reactions:

> B2.1 Synthesis of reactive charge-transporting molecules which can be photo-cross-linked in the presence of free radical initiators or by heating without any initiator.
> B2.2 Photo-cross-linking of the synthesised, charge transporting molecules (monomers) with at least two reactive functional groups.

(REGPOT-2012-2013-1 REGPOT-2012-2013-1 ICT) UNDER GRANT AGREEMENT NO. 316010
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