Synthesis and optoelectronic applications of benzotriazole and dibenzosilole based alternating copolymers

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2014
Erlik, Ozan
Dibenzosilole synonym of silafluorene based polymers have been extensively used as the donor moiety in D-A approach for several years for optoelectronic applications like electrochromic (EC) devices, organic light emitting diodes (OLEDs), organic field effect transistors (OFETs) and most widely organic photovoltaics (OPVs). Moreover, chalcogenophenes such as thiophene and selenophene are used as an energy bridge between the donor and acceptor units to adjust the electronic and optical properties of the conjugated polymers (CPs). In this study, benzotriazole moieties functionalized by different alkyl chains were used as the acceptor unit. Thiophene and selenophene groups were used as π-bridge molecules with their donor character. A silafluorene derivative was used as the donor molecule in the polymer backbone. In this manner, four different p-type conjugated polymers were synthesized via Suzuki coupling reaction. The electrochromic and photovoltaic studies of these polymers were performed. The thermal characterizations of these polymers were conducted using TGA (Thermal Gravimetric Analysis) and DSC (Differential Scanning Calorimetry) techniques. The redox behaviors of the polymers were investigated by CV (cyclic voltammetry) and optical properties were determined by UV-Vis spectrophotometer. In the device fabrication, all components were integrated into ITO coated glass substrate in a moisture free glove box container. In this manner, power conversion efficiencies (PCE) of the polymer:PC71BM active layers were measured under standard AM 1.5 Global illumination (100mW/cm2). The highest PCE value was found as 2.57 % for PBTBTSif in the illumination of the photovoltaic studies.

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Citation Formats
O. Erlik, “Synthesis and optoelectronic applications of benzotriazole and dibenzosilole based alternating copolymers,” M.S. - Master of Science, Middle East Technical University, 2014.