SYNTHESIS OF F AND Cl CONTAINING NOVEL QUINOXALINE-BASED CONJUGATED POLYMERS FOR ORGANIC SOLAR CELL

Date

2025-1-09

Author

Aydın, Sevgi

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In this study, the benzodithiophene-based donor molecules and selenophene π-bridged quinoxaline-based novel acceptor molecules were polymerized by a Stille Cross-coupling reaction to produce nine donor-conjugated polymers. (P1F, P2F, PCL, P1FD2, P2FD2, PClD2, P2FS, PCLS). Six different polymers were synthesized (P1F, P2F, PCl, P1FD2, P2FD2, and PClD2) to produce organic solar cell devices. In addition, the other three polymers (P0F, P2FS, and PClS) were synthesized only to study and compare the optical and electrochemical properties of the polymers. Polymers were characterized by gel permeation chromatography (GPC), thermal gravimetric analysis (TGA), UV-Vis spectrometry, and differential pulse voltammetry (DPV). The optical bandgap (Egopt) values, calculated from the thin-film onset values of the polymers, were determined to be 1.62, 1.70, 1.72, 1.73, 1.76, 1.90, 1.72, 1.74, and 1.97 eV, respectively, in the order of P1F, P2F, PCl, P1FD2, P2FD2, PClD2, P0F, P2FS, and PClS. The HOMO/LUMO energy levels of the polymers were found to be -5.56/-3.87, -5.65/-3.87, -5.86/-3.82, -5.79/-3.91, -5.67/-3.63, -5.84/-3.76, -5.82/-3.78, -5.40/-3.66, and -5.64/-3.64 eV, respectively, in the same order. Devices were constructed using the structure ITO/PEDOT: PSS/Donor: Acceptor/PDINN/Ag, where the active layer consisted of polymers as donor materials blended with fullerene and non-fullerene acceptors. The current-voltage characteristics of the fabricated devices were evaluated using a solar simulator illuminated with AM 1.5G light. The performance of the best devices was recorded as 7.54%, 3.87%, 3.71%, 2.36%, 1.62%, and 1.57% respectively, in the order of polymers used in the active layer: P2F, PCl, P1F, P2FD2, PClD2, and P1FD2.

Subject Keywords

Quinoxaline, Organic Solar Cell, BDT, Conjugated Polymers, Halogen

URI

https://hdl.handle.net/11511/113382

Collections

Graduate School of Natural and Applied Sciences, Thesis