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Modifications of Quinoxaline on the Polymeric Materials for Optoelectronic Devices

Cevher, Şevki Can
Temiz, Cansel
Hızalan Özsoy, Gönül
Udum, Yasemin
Toppare, Levent Kamil
Çırpan, Ali
This study demonstrates that, modifying the rigidity and structural changes on the polymeric materials dictate the optic and electronic properties. Three different conjugated quinoxaline and benzotriazole based polymers were synthesized via Stille cross coupling chemical polymerization method. All changes were localized on the quinoxaline moiety of the conjugated polymers. Characterizations of polymers were done in terms of molecular weight (GPC), absorption wavelengths (Uv-vis spec.), and electronic properties (CV). After all characterizations, polymers were used as photoactive materials, for ultimate purpose, to construct solar cell. Broad absorption of polymers were found as great candidate for electrochromic devices due to 60 % and 94 % percent transmittance in NIR region respectively P2 and P3 with less than 1s switching time. The highest PCE was reported as 2.13 % for P1 with high short circuit current (8.07 mA/cm2), moderate open circuit voltage (0.53 V), low fill factor (50%) and sufficient incident photon to current efficiency (38.33 %). P2 and P3 also showed reasonable PCE value as 1.77 % and 0.95 % respectively.