Syntheses and investigation of optoelectronic properties of 5, 6- BIS (octyloxy) benzo[c][1,2,5]oxadiazole

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2014

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Göker, Seza

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As an acceptor unit, strong electron withdrawing moeities decrease LUMO levels resulting in low band gap polymers. Benzoxadiazole is one of the strongest electron acceptor units in the literature. Air stable polymers of this moeity can be synthesized on account of ability to adopt quinoid form and strong electron accepting property. 2,1,3- Benzooxadiazole bearing conjugated polymers are used for potential applications including organic light emitting diodes, solar cells, electrochromic devices and organic field effect transistor. Besides, alkoxyl substitution of benzooxadiazole unit is very helpful for the construction of the conjugated polymers with better solubility and higher molecular weight. Meanwhile, the polymer chain could have a planar conformation. On account of planar structure, π-conjugation is enhanced which results in extended absorption and low band gap when incorporated into the polymer backbone. In this thesis, 2,1,3-benzooxadizole was coupled with donor groups via both Stille and Suzuki polycondensation reactions. Oxidation and reduction behavior of the polymers were vi studied using cyclic voltammetry. The effect of thermal annealing on morphology was determined for selenophene containing polymer. After optimizing thickness and morphologies of polymer: PCBM, device production and current/voltage property measurements were conducted in a nitrogen-filled glovebox system. The analysis of the photovoltaic devices (ITO/PEDOT:PSS/Polymer:PC70BM/Metal) were performed by means of the energy conversion efficiency measured under standard AM 1.5G illumination.

Subject Keywords

Conducting polymers., Optoelectronics., Photovoltaic effect., Benzooxadiazole.

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http://etd.lib.metu.edu.tr/upload/12617631/index.pdf
https://hdl.handle.net/11511/23779

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. Göker, “Syntheses and investigation of optoelectronic properties of 5, 6- BIS (octyloxy) benzo[c][1,2,5]oxadiazole,” M.S. - Master of Science, Middle East Technical University, 2014.