Synthesis and optoelectronic applications of benzotriazole and dibenzosilole based alternating copolymers

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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Design, synthesis and characterization of 2,1,3-benzothiadiazole comprising polymers: the effect of bridging units on the optoelectronic properties and opv device construction
Zeytun Karaman, Cansu; Toppare, Levent Kamil; Özçubukçu, Salih; Department of Chemistry (2021-2-10)
Recently, conjugated polymers have obtained increasing popularity in a wide range of application areas such as electrochromic (EC) devices, biosensors, organic solar cells (OPVs) and organic light-emitting diodes (OLEDs). This popularity results from ease of processability, a good charge transporting capability, and broad optical absorption ability of the conjugated polymers. 2,1,3 benzothiadiazole has been commonly used in D-A type conjugated polymers since it is one of the strongest acceptor groups result...
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DPP-based conjugated polymers are recently used in organic light emitting diodes, electrochromic devices, organic field effect transistor and organic solar cell applications. Their advantageous properties, such as broad optical absorption in Near Infra Red (NIR) region, high charge carrier mobility and good film forming ability make them an excellent choice for generation of highly efficient solar cells. In this thesis, using donor-acceptor approach (D-A) we aimed to synthesize novel polymers with furan bas...
Investigation of optoelectronic properties of benzotriazole and thiazole bearing conjugated polymers
Ünay, Hakan; Çırpan, Ali; Department of Polymer Science and Technology (2019)
This thesis deals with the design, synthesis and characterization of conjugated polymers P1 and P2 that have potential application in organic solar cell. Polymer design was accomplished by using band gap engineering method. According to that, benzodithiophene (BDT) and silafluorene were chosen as donor groups in P1 and P2 respectively. The acceptor parts were the same for both polymers including benzotriazole (BTZ) and thiazole group. According to electrochemical studies both polymers were having n-dopable ...
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.