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

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2016
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.

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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.