Inverted organic solar cell applications of benzodithiophene and benzotriazole bearing alternating copolymers

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2018
Bolayır, Eda
In this thesis, electrochemical, optical and photovoltaic studies of two novel benzodithiophene and 1,2,3-benzotriazole bearing alternating copolymers were investigated. Benzodithiophene which has a strong electron donating ability and planar structure was used as the donor moiety. On the other hand, benzotriazole was used as an acceptor moiety due to its electron deficient nature. In order to determine the effect of л-bridges, thiophene (P1) and selenophene (P2) moieties were incorporated between the donor and acceptor units. Electrochemical studies revealed that both polymers have ambipolar character. Cyclic voltammetry analysis were carried out to calculate HOMO and LUMO energy levels of polymer P1 and P2. Inverted organic photovoltaic applications of polymers were constructed as following ITO / ZnO / POLYMER:PC71BM / MoO3 / Ag. The J-V measurements of the photovoltaic devices were performed under the standard AM 1.5G illumination. AFM and TEM techniques were used in order to examine thickness and morphology of the polymer films. As a result of several optimization studies, power conversion efficiencies were achieved as 1.30% for P1 and 1.02% for P2, respectively.

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Citation Formats
E. Bolayır, “Inverted organic solar cell applications of benzodithiophene and benzotriazole bearing alternating copolymers,” M.S. - Master of Science, Middle East Technical University, 2018.