[3PS-175]
Substituent Engineering of Difluorobenzotriazole-Based Conjugated Polymers for Enhanced Solar Energy Conversion
발표자이재훈 (국립부경대학교)
연구책임자진영읍 (국립부경대학교)
Abstract
A series of difluorobenzotriazole-based conjugated polymers—P(BDTTH-TfFPzT), P(BDTTCl-TfFPzT), P(BDTTF-TfFPzT), and P(BDTTS-TfFPzT)—were synthesized via Stille coupling with BDT derivatives bearing H, Cl, F, or S substituents. All polymers showed broad UV–Vis absorption (300–800 nm) and optical bandgaps of 1.75–1.80 eV due to π–π* and intramolecular charge transfer (ICT) transitions. Substituents significantly affected optoelectronic properties and morphology: fluorine and sulfur enhanced ICT and packing, chlorine gave moderate improvement. Photovoltaic devices exhibited PCEs of 3.85–7.79%, with P(BDTTF-TfFPzT) achieving the highest efficiency due to fluorine’s electron-withdrawing effect. These results highlight the critical role of substituent engineering in optimizing polymer properties for solar energy applications.