Abstract
Two low band gap polymers (PIDT2FBT and PIDT4FBZ), which are composed of fluorinated elctron donor units (dithienyldifluorobenzothiadiazole (DT2FBT) and dithienyltetrafluorobenzene (DT4FBZ)) and a isoindigo electron accepting unit were implemented in a photoactive layer to invesitigate thier photovoltaic performance. Both low band gap polymers possess exhibit low-lying energy levels and extended light absorption range, which are essential to generate high open circuit voltage and short circuit current density of polymer solar cell. In addition, the blend with PC71BM formed affirmative bulk heterojunction mrophology, resulting in promising power conversion efficiency up to 4.1% with high openc circuit voltage exceeding 1.1 V. Furthremore, the low-lying energy levels of the polymers leaded to good ambient stability of the devices up to 250 h, enabling PIDT2FBT and PIDT4FBZ to be promising candidates for photoactive layer of ambient stable polymer solar cells.
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