Synthesis, characterizations and photovoltaic applications of dithienothiophene and benzotriazole containing conjugated polymers

Cevher, Şevki Can
Fused bithiophene containing conjugated polymers are recently used in different applications; for example organic light emitting diodes, solar cells, electrochromic devices and organic field effect transistors. Fused bithiophene derivatives increase the planarity, charge mobility and decrease band gap when incorporated into the polymer backbone. Connecting atom between the bithiopheneunit can be phosphorous, silicon, nitrogen and sulphur. In this thesis, dihienothiophene was coupled with benzotriazole via Stille Coupling and synthesized polymers were used in optoelectronic applications. Molecular weight and thermal behavior were investigated with GPC, TGA and DSC analysis. Oxidation and reduction behaviors of the polymers were studied with cyclic voltammetry. The absorption properties of the conjugated polymers in solution and film were investigated. After optimizing thickness and morphologies of polymer:PCBM, device production and current/voltage property measurements were conducted in a nitrogen-filled glovebox system (moisture <0.1 ppm; oxygen <0.1 ppm). The analysis of the photovoltaic devices (ITO/PEDOT:PSS/polymer:PCBM/Metal) was performed by means of the energy conversion efficiency measured under standard AM1.5 G illumination (


Synthesis, electrochemical characterization and organic solar cell applications of selenophene containing conjugated polymers
Yaşa, Mustafa; Toppare, Levent Kamil; Department of Polymer Science and Technology (2017)
Donor-Acceptor (D-A) type conjugated polymers are very popular for potential applications such as organic light emitting diodes, solar cells, electrochromic devices and organic field effect transistors. In literature, cyclopentadithiophene and its derivatives are commonly used electron donor units for organic solar cells. The incorporation of selenium atom into polymer backbone results in low band gap polymers as compared to sulfur and oxygen counterparts. In this study, selenophene containing conjugated po...
Syntheses and optoelectronic applications of thiadiazolo quinoxaline bearing alternating conjugated copolymers
Ataoğlu, Emre; Çırpan, Ali; Ünalan, Hüsnü Emrah; Department of Polymer Science and Technology (2016)
Donor-acceptor type conjugated polymers containing thiadiazolo quinoxaline and benzodithiophene derivatives were used as photoactive material for organic solar cell. The alkoxy- substituted benzo[1,2-b;4,5-b’]dithiophene (BDT) monomer, 2,6bis(trimethyltin)-4,8-di(2-ethylhexyloxyl)benzo[1,2-b;4,5-b’]dithiophene, was polymerized with 4,9-dibromo-[1,2,5]thiadiazolo[3,4-g]quinoxaline through a Pd(0)catalyzed Stille coupling reaction. In order to improve the interchain interactions between polymer chains, an alk...
Synthesis and optoelectronic applications of benzotriazole and dibenzosilole based alternating copolymers
Erlik, Ozan; Çırpan, Ali; Department of Chemistry (2014)
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 conj...
Synthesis of new conjugated donor-acceptor type polymers for photovoltaic device applications
Akpınar, Hava Zekiye; Toppare, Levent Kamil; Özkan, Necati; Department of Polymer Science and Technology (2015)
Electrochromism and photoelectric effect are the mostly investigated areas of conducting polymers. In electrochromism, electrochemical parameters of the polymers are firstly examined. Spectroelectrochemical studies are performed with specified wavelengths. Parameters, such as optical contrast and switching times of the polymer films are explored. In bulk heterojunction polymer solar cells, semiconducting polymer materials in combination with fullerene are used as the active layer. Photons are absorbed by co...
Syntheses and investigation of optoelectronic properties of benzothiadiazole and benzotriazole containing conjugated polymers
Keleş, Duygu; Çırpan, Ali; Arslan Udum, Yasemin; Department of Polymer Science and Technology (2017)
Benzothiadiazole is one of the most widely used acceptor units in Donor–Acceptor copolymers for organic solar cells (OSCs) with its strong electron withdrawing ability. It is also known that fluorine atom substitution directly to the backbone of conjugated polymers can improve the important parameters such as power conversion efficiency (PCE), open-circuit voltage (Voc), short-circuit current density (Jsc), and fill factor (FF) of OSCs. Besides benzothiadiazole, benzotriazole is another acceptor moiety whic...
Citation Formats
Ş. C. Cevher, “Synthesis, characterizations and photovoltaic applications of dithienothiophene and benzotriazole containing conjugated polymers,” M.S. - Master of Science, Middle East Technical University, 2013.