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A series of N-dioctylmethyl-2,7-carbazole-alt-5,7-bis(thiophen-2-yl)-2,3-biphenylthieno[3,4-b]pyrazine(PCz-3Th Pz-Ph)copolymeric derivatives appending various donor units in two phenyl rings,namely,PCz-3Th Pz-Ph Th,PCz-3Th Pz-Ph Fl,PCz-3Th Pz-Ph Cz,and PCz-3Th Pz-Ph Tpa were synthesized and characterized.The effect of these appending donor units,e.g.,thiophene(Th),fluorene(Fl),carbazole(Cz),and triarylamine(Tpa),was investigated on dispersible,optical,electrochemical,and photovoltaic properties for their polymers.The copolymers of PCz-3Th Pz-Ph Cz and PCz-3Th Pz-Ph Tpa containing Cz or Tpa units exhibited higher short-circuit current density(Jsc)and power conversion efficiency(PCE)in their bulk heterojunction polymeric solar cells.The highest PCE of 1.66%and Jsc of 7.16 m A cm 2 were obtained in a device with the PCz-3Th Pz-Ph Cz/PC61BM blend under AM 1.5 G irradiation(100 m W cm 2);these values are 1.78 and 1.59 times higher than the corresponding values for the PCz-3Th Pz-Ph-based device.When PC61BM was placed by PC71BM,the PCz-3Th Pz-Ph Cz-based device displayed an enhanced PCE of 2.98%and a Jsc of 10.88 m A cm 2.This work demonstrated that appending additional hole-transporting units of Cz and Tpa into the side-chain of a polymer with a D-A backbone can significantly enhance the photovoltaic performance of their resultant polymers.
A series of N-dioctylmethyl-2,7-carbazole-alt-5,7-bis (thiophen-2-yl) -2,3-biphenylthieno [3,4- b] pyrazine (PCz-3Th Pz- derivatives appending various donor units in two phenyl rings, namely, PCz-3Th Pz-Ph Th, PCz-3Th Pz-Ph Fl, PCz-3Th Pz-Ph Cz, and PCz-3Th Pz-Ph Tpa were synthesized and characterized. effect of these appending donor units, eg thiophene (Th), fluorene (Fl), carbazole (Cz), and triarylamine (Tpa), was investigated on dispersible, optical, electrochemical, and photovoltaic properties for their polymers. -3Th Pz-Ph Cz and PCz-3Th Pz-Ph Tpa containing Cz or Tpa units implied higher short-circuit current density (Jsc) and power conversion efficiency (PCE) in their bulk heterojunction polymeric solar cells. The highest PCE of 1.66% and Jsc of 7.16 m A cm 2 were obtained in a device with the PCz-3Th Pz-Ph Cz / PC61BM blend under AM 1.5 G irradiation (100 m W cm 2); these values are 1.78 and 1.59 times higher than the corresponding values for the PCz-3Th Pz-Ph-based de the PC61BM was placed by PC71BM, the PCz-3Th Pz-Ph Cz-based device displayed an enhanced PCE of 2.98% and a Jsc of 10.88 m A cm 2. This work demonstrates that appending additional holes-transporting units of Cz and Tpa into the side-chain of a polymer with a DA backbone can significantly enhance the photovoltaic performance of their resultant polymers.