Syntheses of conjugated polymers and investigation the effect of gold nanoparticle - thiol interaction for organic solar cell application

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Selin Gülmez-MS Thesis.pdf

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2022-8-31

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Gülmez, Selin

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In this thesis, five benzo[c][1,2,5] thiadiazole-based conjugated polymers were synthesized. Four of them were synthesized via Stille and Suzuki coupling reactions and the remaining one was synthesized by post-polymerization. The effect of functional groups of the tip of the alkyl chain was analyzed. Moreover, thiol group and gold nanoparticle interaction on the organic solar cell efficiency for P1-SH were investigated. Electronic and optical band gaps of polymers were found as 1.85/1.81, 1.95/1.85, 1.83/1.95, 1.87/1.87, and 1.83/1.85 eV respectively for P1, P1-Br, P1-SH, P2, and P3. Furthermore, the effect of the addition of gold nanoparticles to the active layer of organic solar cells on photovoltaic properties was investigated. Gel permeation chromatography (GPC), thermal gravimetric analysis (TGA), differential scanning calorimeter (DSC), and UV-Vis-NIR spectroscopy were used to evaluate the synthesized polymers. By using the cyclic voltammetry (CV) technique, redox behaviors and electronic band gaps of polymers were examined. In a nitrogen-filled glovebox setup, device manufacture and current/voltage property measurements were performed. Synthesized polymers served as the donor units for the typical type device structure of ITO/PEDOT:PSS/polymer:PC71BM/LiF/Al, with PC71BM serving as the acceptor unit. Under 100 mW cm-2 light, the photovoltaic characteristics of the built-in devices were measured. Best device performances in terms of PCE were found as 2.06 % for P1, 1.52 % for P1-Br, 1.22 % for P1-SH. Photovoltaic studies of P1-SH:AuNPs were investigated and the best device performances in terms of PCE were found as 1.08 %.

Subject Keywords

Conjugated polymers, Gold nanoparticles, Benzothiadiazole, Power conversion efficiency

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https://hdl.handle.net/11511/99230

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. Gülmez, “Syntheses of conjugated polymers and investigation the effect of gold nanoparticle - thiol interaction for organic solar cell application,” M.S. - Master of Science, Middle East Technical University, 2022.