Preparation And Characterization Of Metal-phthalocyanine Nanomaterials By PVD

Organic optoelectronic materials are a class of optical activity of organic material, widely used in organic light-emitting diodes, organic field-effect transistors, organic solar cells, organic memory devices, and other fields. Compared with inorganic materials, organic photovoltaic materials can be prepared by solution method to achieve large area and flexible device fabrication. In addition, organic materials have a wide variety of composition and performance tuning space, where molecules can be designed to obtain the required performance, to bottom-up self-assembly method to prepare nano-device assembly devices and molecular devices. Organic single crystal can not only reveal the intrinsic nature of the material, but also to be one of the best choices to build high-performance optoelectronic devices, in recent years by the widespread concern, so explore the performance of controlled morphology and preparation method of organic nano-materials with important research value.In this thesis, organic low dimensional materials with controllable morphologies and properties were fabricated from several model compounds through simple vapor phase deposition. The optical and electrical properties of the as-prepared organic nanomaterials were investigated in detail. Successfully prepared three kind of organic one-dimensional materials, it has laid a good foundation for the design of nano-electronic devices. The cobalt phthalocyanine (CoPc) as a model compound, prepared CoPc nanowires by physical vapor deposition (PVD). In specific growth conditions, gained a high percentage of multi-helix structure of CoPc. Through inducing Al₂O₃ as the absorption, get a monodispersity and surface support CoPc nanowires. Some fundamental and novel properties of CoPc nanomaterials and devices have been studied, such as the flexibility of organic crystals, photovoltaic properties, which indicated potential applications of the sub-micro/nanomaterials in electronic and optoelectronic devices. For example, based on the flexibility high-performance all organic nanotransistors were fabricated, indicating a huge potential for future miniature organic integrated circuit. Then, single-crystal nikel-phthalocyanine (NiPc) nanorods were synthesized by a facile vapor transfer deposition method and investigated by various techniques such as SEM, TEM, XRD, and FT-IR. The deposited NiPc nanorods were found to be theβ-phase single crystals. Moreover, the NiPc nanorods-based devices were fabricated and exhibited high photocurrent upon white-light illumination, the result shows that at an applied voltage of 12 V is of about 2×10-7 A. This indicates that the NiPc nanorods can be considered as a candidate material for fabricating photoelectric devices. At last, Alq₃ nanowires were prepared by physical vapor deposition (PVD). The results indicate that the as-prepared Alq₃ nanowires are single crystals, monodispersity,and surface bound on the silica waffer. Moreover, the cathode fluorescent spectrum of the Alq₃ nanowires exhibits a strong fluorescence emission at 510 nm. The conducting-probe atomic force microscopy (CP-AFM) measurements reveal that the current flow along the physically contacted probe increases monotonically with the bias above a critical value Vbias≈5.0 V.The results show that the organic one-dimensional materials prepared by the physical vapor deposition (PVD) is a viable approach, one-dimensional organic materials in the field of organic optoelectronic devices has broad application prospects.