Self-assembling hetero-junction structures based on perfluoroalkylated phthalocyanine and PCBM attributed to fluorophobic/fluorophilic interactions

Abstract

Perfluoroalkyl or linear alkyl chain substituted at non-peripheral position of phthalocyanines (Pcs) were synthesized and investigated the effects of the fluorophilic/fluorophobic interactions, their mesophase and electronic properties. Both Pcs exhibit columnar mesomorphism and the thermal stability of liquid crystalline phase is enhanced as incorporation of perfluoroalkyl group, probably due to the nano-segregation between the fluorinated and hydrocarbon moieties in the terminal alkyl chains. Perfluoroalkylated PCBM was also synthesized and characterized to investigate in the binary blends of perfluoroalkylated Pc and PCBM, to confirm the possibility for controlling well-ordered bulk hetero-junction structure for organic solar cells.