Synthesis and Characterization of Donor-Acceptor Semiconducting Polymers Containing 4-(4-((2-ethylhexyl)oxy)phenyl)-4H-dithieno[3,2-b:2',3'-d]pyrrole for Organic Solar Cells

In this study, new donor-acceptor (D-A) conjugated polymers based on 4-(4-((2-ethylhexyl)oxy)phenyl)-4H-dithieno[3,2-b:2',3'-d]pyrrole (EPDP) and 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-ethylhexyl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (BTBP) or 4,7-bis(5-bromothiophen-2-yl)benzo[c][1,2,5]thiadiazole (BT) have been synthesized successfully via direct(hetero)arylation polymerization using Pd(OAc)¬2 and PCy3.HBF4 as catalyst system. The obtained D-A conjugated polymers have been characterized via 1H NMR, GPC, FTIR, DSC, XRD, PL and UV-Vis methods. Afterward, the D-A conjugated polymers have been applied for the fabrication of organic solar cells based on bulk-heterojunction (BHJ) structures.