“…Organic phototransistors, i.e., OFETs in which an incident light is used in addition to a gate field to modulate the charge-carrier density inside the channel, have many advantages over their inorganic counterparts, such as the tunability of their optoelectronic properties via the molecular design and their possibility to be assembled on nonplanar supports opening perspectives toward their flexible thus wearable applications. − Low-dimensional organic architectures such as crystalline micro/nanowire, − microribbon and quantum dot , structures have showed high photosensitivity and high charge carrier properties. Among organic semiconducting molecules used as active components in efficient phototransistors, perylene di-imide (PDI) derivatives are particularly suitable because of their characteristic absorption in the visible region combined with the capacity to transport electrons. − One of the major limitations of organic transistors, especially those based on n -type systems, is their air sensitivity. To overcome such a limitation, we have focused our attention on air-stable n -type perylene di-imide derivative, i.e., N , N ′-1H,1H-perfluorobutyl-dicyano perylene di-imide (PDIF-CN 2 ) (Figure ), which is known to form highly crystalline fibers by solvent-induced precipitation (SIP), being a simple solution-processable method to produce high-performing crystalline structures with respect to those that are vapor-grown.…”