Synthesis and characterization of phenanthro-imidazole based conjugated copolymer for optoelectronic applications

Sohrabnia, Nima
Benzodithiophene and flourene represent tremendous promise as donor moieties in donor-acceptor approach for optoelectronic applications. The strong intermolecular π-π stacking, coplanar and rigid structure as well as symmetric configuration of these moieties enhance charge mobility and reduce band gap when incorporate in back bone of polymer within pull and push system. In order to decrease angle torsion and adjusting the optoelectronic properties of polymers, chalcogenophenes utilize as bridge between donor and acceptor. In this study, three different phenanthro imidazole containing conjugated copolymers (P1,P2 and P3) were synthesized using benzodithiophene and flourene via Suzuki and Stille condensation reactions. The structural characterizations of polymers were performed by NMR and the molecular weight of these polymers was measured via GPC. P1 utilized as active layer in single layer organic light emitting diode with device structure of ITO/PEDOT:PSS/P1/LiF:Al. The observed color was cyan with luminance of 5560 cd/m2 at 13 volts. For photovoltaic application P2 and P3 were used as active layer with device structure of ITO/PEDOT:PSS/Polymer:PC71BM/Ca:Al. The best of OPVs devices showed 0.94% PCE for P2 and 0.91% for P3 under standard AM 1.5 (100 mW/cm2) condition. 


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Citation Formats
N. Sohrabnia, “Synthesis and characterization of phenanthro-imidazole based conjugated copolymer for optoelectronic applications,” M.S. - Master of Science, Middle East Technical University, 2016.