Syntheses, spectroelectrochemical and electrochemical characterizations of naphthodithiophene containing polymers for solar cell applications

Akbayrak, Merve
This study consists of synthesis of alternating donor-acceptor type hybrid monomers based on various carbazole units as the electron rich donor group and thieno[3,4c]pyrrole-4,6-dione (TPD) or 2,5-dihydro-3,6-di-2-thienyl-pyrrolo[3,4-c]pyrrole-1,4dione (DPP) as the electron poor acceptor unit. The main goal of this research was not only to synthesize new low band gap polymers but also to shed more light on the substituent and linkage side effect of carbazole units on the optoelectronic properties of monomers and polymers. For this aim, four donor-acceptor-donor type monomers were synthesized via Suzuki coupling reaction and were characterized by spectroscopic techniques. The monomers synthesized in this work were polymerized by both potentiodynamic and potentiostatic electrochemical techniques. Electrochemically obtained polymer films, exhibited quasi-reversible redox behavior due to doping/dedoping of the polymers which were accompanied by a reversible electrochromic behavior. Their band gap values (Eg) were elucidate utilizing spectroelectrochemical and electrochemical data and it was found that polymers obtained from 3,6-substituted carbazole derivatives have slightly lower band gap values than 2,7-substituted carbazole derivatives.


Syntheses and Optical Properties of Perfluorophenyl Containing Benzimidazole Derivatives: The Effect of Donor Units
ILERI, Merve; HACIOGLU, Serife O.; Çırpan, Ali; Toppare, Levent Kamil (2015-07-03)
Synthesis of two novel donor - acceptor - donor type monomers containing benzimidazole as the acceptor unit and thiophene and 3,4-ethylenedioxythiophene (EDOT) as the donor units were performed. 2-(Perfluorophenyl)-4,7-di(thiophen-2-yl)-1H-benzo[d]imidazole and 4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2-(perfluorophenyl)-1H-benzo[d]imidazole were synthesized successfully and polymerized electrochemically. The electrochemical and spectroelectrochemical studies of the polymers were studied. The effec...
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Tirkeş, Seha; Önal, Ahmet Muhtar; Department of Polymer Science and Technology (2008)
New compounds consisting of 3-thienyl and aniline units linked by polyether bridges have been synthesized and their electrochemical polymerization was performed via constant potential electrolysis and cyclic voltammetry. In the case of 3-thienyl derivatives two compounds, 1,12-di-3-thienyl-2,5,8,11-tetraoxadodecane (MI) and 1,15-di-3-thienyl-2,5,8,11,14-pentaoxapentadecane (MII) were synthesized utilizing literature methods and their corresponding polymers, poly(I) and poly(II) were prepared in an electroly...
Syntheses of novel fluorinated dibenzo[a,c]phenazine comprising polymers for electrochromic device applications
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In this study, two novel fluorinated dibenzo[a,c]phenazine derivatives, 2,7-bis(5-bromo-4-hexylthiophen2-yl)-11-fluorodibenzo[a,c]phenazine (TFBPz) and 2,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-11- fluorodibenzo[a,c]phenazine (EFBPz), were synthesized by coupling fluorodibenzo[a,c]phenazine (FBPz) with electron rich 3-hexylthiophene and ethylene dioxythiophene (EDOT) units. The monomers were polymerized electrochemically and their electrochemical, spectroelectrochemical and electrochromic behavi...
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The present study focuses on the synthesis, microstructural and magnetic properties of ternary FeNiCo nanoparticles. Nanocrystalline ternary FeNiCo particles were synthesized via hydrogen reduction assisted ultrasonic spray pyrolysis method in single step. The effect of precursor concentration on the morphology and the size of particles was investigated. The syntheses were performed at 800 degrees C. Structure, morphology and magnetic properties of the as-prepared products were characterized through X-ray d...
Synthesis and characterization of conjugated polymers with polyhedral oligomeric silsesquioxane pendant groups
Ertan, Salih; Kaynak, Cevdet; Cihaner, Atilla; Department of Polymer Science and Technology (2017)
In this thesis, a series of monomers covalently bonded to polyhedral oligomeric silsesquioxane (POSS) pendant group was designed and synthesized. POSS group is a hybrid organic-inorganic nanostructure with 1 to 3 nm diameter. POSS which has a cage structure is mainly composed of silicon (Si) (at vertices) and oxygen (O) (in the middle of the edge). POSS nanostructure can be modified through the vertices with organic functional groups. POSS groups provide different properties, such as thermal robustness, mec...
Citation Formats
M. Akbayrak, “Syntheses, spectroelectrochemical and electrochemical characterizations of naphthodithiophene containing polymers for solar cell applications,” M.S. - Master of Science, Middle East Technical University, 2016.