Abstract
In order to investigate the relationships between chemical structures of conjugated polymers and their properties with respect to photovoltaic applications, two new copolymers consisting of an electron-deficient tetrazine unit and either an electron-rich carbazole (PCTz) or fluorene (PFTz) along with thiophene spacers were synthesized. The estimated electrochemical bandgap and HOMO level of PCTz and PFTz were 2.23/−5.32eV and 2.48/−5.60eV, respectively. PCTz had a very high absorption coefficient, which was even higher than poly(3-hexyltiophene) in chloroform solution. The bulk heterojunction photovoltaic devices fabricated using PCTz and [6,6]-phenyl-C71-butyric acid methyl ester had a high open-circuit voltage (1.0V) under AM 1.5G illumination at 100mW/cm2 with a power conversion efficiency of 2.13%.
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