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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...
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