IUPAC: Poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}) CAS: 1266549-31-8 光電應用上屬低能隙聚合物,搭配 PC71BM使用,可使太陽能電池>7% PCE