Syntheses of new multifunctional donor acceptor type polymers for electrochromic and organic solar cell applications /

Özdemir Hacıoğlu, Şerife
Combining donor and acceptor moieties in the polymer backbone enhances D–A interactions and helps in developing the most efficient polymers for various applications. Besides obtaining low band gap polymers, the D–A approach is also useful in producing polymers with improved optical, mechanical and electronic properties. Changing both or either of the donor/acceptor groups is an effective method to design these alternating systems. For this purpose different acceptors units such as; benzothiodiazole, benzotriazole, quinoxaline and benzimidazole were coupled with different donor units but the desired properties could not be combined up to now. In this thesis firstly it is aimed to design a new acceptor unit which is the combination of benzotriazole and quinoxaline units (triazoloquinoxaline unit). After synthesis of this new acceptor unit, it was coupled with donor units and electrochemical and spectroelectrochemical characterization were performed. Furthermore affect of π bridge on electrochemical behaviors were also investigated via synthesizing benzotriazole and triphenylamine bearing random copolymers. Cyclic Voltammetry (CV) and UV–Vis-NIR spectrohotometer were used to investigate electrochemical behaviors of the the monomers and conducting polymers. Finally while triazoloquinoxaline derivatives were used for electrochromic device applications, triphenylamine bearing copolymers were used for organic solar cell applications as donor materials.  


Development of P and N type donor acceptor conjugated polymers for electrochromic and organic solar cell applications /
Akbaşoğlu Ünlü, Naime; Çırpan, Ali; Department of Chemistry (2015)
Donor-acceptor (D-A) approach is highly efficient to obtain p-type and n-type materials with desired intrinsic optical and electrochemical properties. Therefore, in this study a series of p-type and n- type DA type conjugated polymers was synthesized with combination of electron donating and electron-withdrawing heterocyclics to understand the effects of structural modifications on electrochemical, optoelectronic and photovoltaic properties. Synthesized polymers were utilized for electrochromic and organic ...
Investigation the effect of π bridge and side chain on photovoltaic properties of benzodithiophene and quinoxaline based conjugated polymers
Taşkaya Aslan, Sultan; Alemdar, Eda; Hacıefendioğlu, Tuğba; UDUM, YASEMİN; Toppare, Levent Kamil; Yıldırım, Erol; Çırpan, Ali (2022-04-15)
© 2022 Elsevier LtdA series of donor–acceptor type alternative polymers containing 2D-BDT and 1D-BDT as the donors and quinoxaline as the acceptor were successfully obtained by Stille coupling reactions. Synthesized polymers containing selenophene and thiophene as π-bridges in their backbones and 2-ethylhexylselenophene and 2-ethylhexylalkoxy side groups on the BDT structure were named as P1, P2, P3 and P4, respectively. Eonsetox and Eonsetred were investigated for P1, P2, P3, and P4, respectively. Onset ox...
Syntheses and characterization of benzotriazole, thienopyrroledione and benzodithiophene containing conjugated random terpolymers for organic solar cells
Göksu, Kardelen.; Çırpan, Ali; Department of Chemistry (2019)
Two random terpolymers, PBTS and PBTSe were designed and synthesized successfully as the donor units for polymer organic solar cell. Desired terpolymers contain alkoxy-benzodithiophene as an electron rich unit and Noctylthieno[3,4,c]pyrrole-4,6-dione (TPD) as the electron deficient group. Furthermore, thiophene and selenophene π bridges were introduced to benzotriazole unit as the acceptor moieties into copolymer backbone. The properties of synthesized terpolymers solar cell device were investigated by opti...
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...
Syntheses of functional materials for organic photovoltaic and electrochromic device applications
Varlıoğlu, Figen; Günbaş, Emrullah Görkem; Department of Polymer Science and Technology (2017)
Thienothiophene based moities are widely investigated for organic solar cell applications. In this study, after synthesizing 2-ethylhexyl 4,6-dibromothieno [3,4-b]thiophene-2-carboxylate successfully, copolymerization with commercially available donor 4-(2-ethylhexyl)-2,6-bis(trimethylstannyl)-4H-dithieno[3,2-b:2',3'-d]pyrrole, DTPy, was performed via Stille coupling. At each step, Nuclear Magnetic Resonance (NMR) Spectroscopy were performed for structural analysis. Cyclic voltammogram was used for investig...
Citation Formats
Ş. Özdemir Hacıoğlu, “Syntheses of new multifunctional donor acceptor type polymers for electrochromic and organic solar cell applications /,” Ph.D. - Doctoral Program, Middle East Technical University, 2016.