THIENOTHIOPHENE Π-BRIDGE MODIFIED QUINOXALINE BASED CONJUGATED POLYMERS FOR ORGANIC SOLAR CELLS

Date

2025-6-25

Author

Arslan Ünver, Gizem

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In this study, novel thienothiophene π-bridged three different quinoxaline based monomeric acceptor units and two different benzodithiophene based monomeric donor units were polymerized via Stille Cross-Coupling reactions to synthesize six different conjugated donor polymers (P1, P2, P3, P4, P5, and P6). These polymers were used in the active layer of organic solar cell by bulk heterojunction type mixture with non-fullerene type acceptors. Moreover, the effect of different halogen and side chain substitutions to the polymers on optical, electrochemical, and photovoltaic properties were investigated. According to the UV-Vis spectrometry, the optical band gaps of P1, P2, P3, P4, P5, and P6 were calculated as 1.70, 1.75, 1.95, 1.64, 1.71, and 1.89, respectively. Based on the DPV results that are similar to the CV results, the HOMO/LUMO energy levels of the polymers were found as -5.55/-3.67, -5.49/-3.72, -5.94/-3.74, -5.79/-3.73, -5.60/-3.68, and -5.96/-3.74 for P1, P2, P3, P4, P5, and P6, respectively. The conventional type organic solar cell devices were fabricated with the structure of ITO/PEDOT:PSS/Donor:Acceptor/PDINN/Ag. Using a solar simulation system with AM 1.5 G light, current-voltage characteristics of the constructed devices were investigated. According to the calculated power conversion efficiencies of the devices, the best device performances were found as 2.87% for P1, 3.78% for P2, 3.58% for P3, 4.00% for P4, 5.98% for P5, and 1.39% for P6.

Subject Keywords

Quinoxaline, Benzodithiophene, Halogen Effect, Conjugated Polymer, Organic Solar Cell

URI

https://hdl.handle.net/11511/115179

Collections

Graduate School of Natural and Applied Sciences, Thesis