The Formation And Characteristics Of Inorganic/Organic Hybrid Junction Based On N-ZnO/P-PF Structure

Because of its wide band gap (3.37eV) and relatively large exciton binding energy (60meV) at room temperature, and other unique advantages, such as good chemical stability, thermal stability, biological compatibility, ZnO has become one of the hottest research topics in advanced materials and devices.As a material, ZnO can be grown as thin films through pulsed laser deposition (PLD), magnetron sputtering, electrochemical deposition, metal organic chemical vapor deposition (MOCVD) and others, at the same time it can be prepared into nanostructures Including the nanowires, nanorods, nanotubes, nano-clusters, etc, through a variety of methods. The nanostructure have a bigger table body area, quantum size effect, and less stress on the substrate of larger lattice contrast the film materials, these features in the application of electronic components play a crucial role. Low-temperature aqueous chemical growth method has been proven to be a high performance growth technique for ZnO NRs, due to its excellent advantages such as low cost, low temperature, non-toxic operation and environmental friendliness. However, the highly efficient and reliable p-type ZnO is still difficult to be achieved, which has significantly limited the development of ZnO homojunction devices. Other p-type materials have been combined with n-ZnO to fabricate heterojunction LEDs, such as GaN, Si, diamond, even organic polymers. There are different options of the choice for the p-type polymers to be combined with n-type ZnO to form the inorganic/organic hybrid junction devices. Among the possible candidates, Polyfluorene (Pf) is a novel and promising blue light emitting materials with extremely high efficiency. The ZnO NR/PF heterostructure has the potential to emit white-light, the white-light electroluminescence is attributed to the greatly enhanced green-yellow emission associated with the ZnO surface defects at the ZnO NR/PF heterostructure and the blue emission from the PF.1. The inorganic-organic hybrid junction with n-ZnO nanorods/p-polyfluorene (PF) structure was grown with low-temperature aqueous chemical growth method. The results indicate that densely and uniformly distributed ZnO nanorods were successfully grown on the PF layer, and a p-n junction with reasonable rectifying behavior was formed at the interface between ZnO NR inorganic layer and PF organic layer.2. A comparative study was performed through quantitative analyzing the performance of the as-grown ZnO based inorganic/organic hybrid junction with film and nanorods structure, respectively. The great advantage of aqueous chemical grown ZnO nanorods over the sputtered film in view of inorganic/organic hybrid junction was quantitativel demonstrated, and a p-n junction with obviously rectifying behavior was achieved unde optimal conditions. These results indicate that the ZnO nanorods based inorganic/organi hybrid junction possess very interesting electrical and optical properties, thus they are mor suitable and promising for the fabrication of high-performance optoelectronic devices.