title: High-Performance Phototransistors Based on PDIF-CN2 Solution-Processed Single Fiber and Multifiber Assembly.
abstract: Here we describe the fabrication of organic phototransistors based on either single or multifibers integrated in three-terminal devices. These self-assembled fibers have been produced by solvent-induced precipitation of an air stable and solution-processable perylene di-imide derivative, i.e., PDIF-CN2. The optoelectronic properties of these devices were compared to devices incorporating more disordered spin-coated PDIF-CN2 thin-films. The single-fiber devices revealed significantly higher field-effect mobilities, compared to multifiber and thin-films, exceeding 2 cm(2) V(-1) s(-1). Such an efficient charge transport is the result of strong intermolecular coupling between closely packed PDIF-CN2 molecules and of a low density of structural defects. The improved crystallinity allows efficient collection of photogenerated Frenkel excitons, which results in the highest reported responsivity (R) for single-fiber PDI-based phototransistors, and photosensitivity (P) exceeding 2 × 10(3) AW(-1), and 5 × 10(3), respectively. These findings provide unambiguous evidence for the key role played by the high degree of order at the supramolecular level to leverage the material's properties toward the fabrication of light-sensitive organic field-effect transistors combining a good operational stability, high responsivity and photosensitivity. Our results show also that the air-stability performances are superior in devices where highly crystalline supramolecularly engineered architectures serve as the active layer.
authors.affiliation: Nanochemistry Laboratory, ISIS & icFRC, Université de Strasbourg & CNRS , 8 allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Wassima
authors.initials: W
authors.lastname: Rekab
authors.affiliation: Nanochemistry Laboratory, ISIS & icFRC, Université de Strasbourg & CNRS , 8 allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Marc-Antoine
authors.initials: MA
authors.lastname: Stoeckel
authors.affiliation: Nanochemistry Laboratory, ISIS & icFRC, Université de Strasbourg & CNRS , 8 allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Mirella
authors.initials: M
authors.lastname: El Gemayel
authors.affiliation: Nanochemistry Laboratory, ISIS & icFRC, Université de Strasbourg & CNRS , 8 allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Marco
authors.initials: M
authors.lastname: Gobbi
authors.affiliation: Nanochemistry Laboratory, ISIS & icFRC, Université de Strasbourg & CNRS , 8 allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Emanuele
authors.initials: E
authors.lastname: Orgiu
authors.affiliation: Nanochemistry Laboratory, ISIS & icFRC, Université de Strasbourg & CNRS , 8 allée Gaspard Monge, 67000 Strasbourg, France.
authors.forename: Paolo
authors.initials: P
authors.lastname: Samorì
keywords: organic field-effect transistor; perylene di-imide; photoconductivity; phototransistor; single fiber