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

Işık, Ebru
Naphthodithiophene is a thiophene fused naphthalene with a rigid and planar structure with extended π-conjugation system. Due its electron rich nature it has been recently employed in donor-acceptor type conducting polymers which are used as active layers in organic solar cells and organic field effect transistors. In this study alkoxy functionalized naphthodithiophene bearing two new random copolymers were designed and synthesized. As acceptor moiety in the polymer backbone electron deficient benzotriazole moiety was used. Thiophene and bithiophene units were used as π-linkers to enhance electron delocalization through polymer chain. Polymers were synthesized via Stille polycondensation reaction. Investigation of optoelectronic properties of synthesized polymers were performed with cyclic voltammetry and spectroelectrochemistry studies. Moreover, colorimetric and kinetic properties of the polymers were examined. From thiophene bridge to bithiophene bridge improvements in the properties of polymers were observed. Synthesized polymers were used as donor in bulk heterojunction organic solar cell applications together with PC71BM acceptor. Polymer bearing bithiophene as π-bridge demonstrated 1.17% maximum power conversion efficiency.


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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 S...
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Ünay, Hande; Çırpan, Ali; Ünalan, Hüsnü Emrah; Department of Polymer Science and Technology (2014)
Polymers containing selenophene as a π bridge; poly(2-(2-octyldodecyl)-4-(selenophen-2-yl)-7-(5-(thiophen-2-yl)selenophen-2-yl)-2H-benzo[d][1,2,3]triazole) (P-SBTTh) and poly(2-(2-octyldodecyl)-4-(5-phenylselenophen-2-yl)-7-(selenophen-2-yl)-2H-benzo[d][1,2,3]triazole (P-SBTPh) were synthesized via Stille and Suzuki coupling, respectively. Optical and electrochemical properties were investigated and comparisons with their thiophene analogs were done. Selenophene substitution resulted in low band gap and red...
Citation Formats
E. Işık, “Syntheses, spectroelectrochemical and electrochemical characterizations of naphthodithiophene containing polymers for solar cell applications,” M.S. - Master of Science, Middle East Technical University, 2016.