Fused conjugated structures for organic electronics

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2019
Cevher, Şevki Can
In the first application, to investigate the organic light emitting diode device performances three different polymers were synthesized in which fused phenantroimidazole ring was combined with benzotirazole based polymeric backbone. P1 incorporated electroluminescent device exhibited superior performance. The highest luminance efficiency for P1 based device was 3.01 cd/A with a luminance value of 140,180 cd/m2. In the second part, monomer M1 was synthesized and functionalized from ketone (M1) to oxime (M2) and enamine (M3) for laccase based catechol biosensors. Laccase immobilized by crosslinking with glutaraldehyde on bare polymer coated galssy carbon electrode. M1 based electrode exhibited superior performance linear range between 0.005-0.175 mM with detection limit of 9.86 μM without need of any additional support material. In the final part, four similar polymers were synthesized where the effect of chalcogens or effect of electron donating/withdrawing ability of substituents were investigated separately. PO gave the highest power conversion efficiency among others with a value of 4.72 %. Hence preliminary studies of polymers exhibited promising properties for efficient solar cells. Two more polymers were synthesized to enlarge the absorption of conjugated polymers to infrared region. Optical band gaps of polymers were calculated from absorption on set values of 870 and 760 nm as 1.42 and 1.63 eV respectively for PIQBDT and PIQCAR. The last study covered the synthesis of polymeric material, which can covalently bond to plasmonic nanoparticles. In this way morphological distribution of plasmonic nanoparticles could be in close proximity to polymer in solar cells.

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Citation Formats
Ş. C. Cevher, “Fused conjugated structures for organic electronics,” Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Chemistry., Middle East Technical University, 2019.