CONJUGATED POLYMERS AND ORGANIC CATIONS FOR OPTOELECTRONIC APPLICATIONS

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2022-1-27
Yaşa, Mustafa
There are several studies on organic solar cells based on conjugated polymers in literature, and various new materials are being designed. The Donor-Acceptor approach has been the most common approach for designing and synthesizing conjugated polymers. In this study, thienopyrroledione bearing conjugated polymers were synthesized via Stille and Suzuki polycondensation reactions. In the first part of this thesis, the polymers obtained via Stille polycondensation were employed to fabricate organic solar cells (OSCs). Both non-fullerene and fullerene-based devices were fabricated. The best non-fullerene-based device performed a power conversion efficiency of 7.94%, whereas the best fullerene-based device performed 7.62%. In the second part, one of the polymers obtained via Stille polycondensation was used to fabricate biosensors for catechol detection. The biosensor exhibited linearity between 1.25 and 175 μM catechol, with a LOD of 1.23 μM and sensitivity of 737.4 μA.mM−1.cm−2. In the third part, the polymers obtained via Suzuki polycondensation were examined to see the effect of a second acceptor unit through random polymerization, and the study revealed that the introduction of a selenophene moiety decreased the optical band gaps of the polymers whereas the introduction of a second acceptor moiety increased the optical band gaps. As another emerging technology for energy conversion, Perovskite solar cells have been the point of attraction. Therefore, the last part covers syntheses of a series of chalcogenophene containing molecules to be employed as organic cations for surface treatment of 3D perovskite films in the fabrication of Perovskite solar cells. The best perovskite solar cell device constructed with the utilization of one of the molecules exhibited a power conversion efficieny of 22.43%.

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Citation Formats
M. Yaşa, “CONJUGATED POLYMERS AND ORGANIC CATIONS FOR OPTOELECTRONIC APPLICATIONS,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.