| ZnO is a typical direct and wide bandgap semiconductor material with a direct band gap of 3.37 eV and a large exciton binding energy of 60 meV at room temperature.One-dimensional(1D)ZnO nanostructures(e.g.,nanowire,nanorods)not only have the stable chemical,optical and electrical properties of ZnO,but also have the unique physical and chemical properties of nano-materials,have been widely utilized in many fields,such as nano-electriomechanical system,photocatalysis,light emitting diode,sensor,solar cell,photodetection and so on.At present,the development of a high-performance ultraviolet photodetector based on ZnO has been impeded by lack of stable p-type wide gap semiconductor materials.In this dissertation,adopting organic small molecule phenanthrene,organic polymer poly(2,5-dibutoxybenzene-1,4-diyl)composite ZnO nanorod arrays based on the study of ZnO nano-materials,and architecting ZnO-based organic and inorganic heterojunction UV photoelectric detector.The materials and device were characterizated and analysed by scanning electron microscope(SEM),scanning electron microscopy energy dispersive spectrometer(EDS),transmission electron microscope(TEM),atomic force miscroscope(AFM),X-ray diffraction microscope(XRD),ultraviolet-visable-near infrared(UV-Vis-NIR)absorption and fluorescence spectra(PL-PLE),Raman spectroscopy and Keithley 2400.The main contents include:1.The crystalline ZnO nanorods with good crystallinity were prepared by hydrothermal method based on the sol-gel synthesis of ZnO nano-film.The controllable growth conditions and optical properties of 1D ZnO nanomaterials were studied,and the properties of Ag/ZnO nanorods/ITO metal-semiconductor-metal ultraviolet photodetectors were further analyzed.2.The formation of ZnO nanorods/phenanthrene heterojunction photodetectors include small organic molecules phenanthrene and the ZnO nanorod arrays.The small organic molecules can enhance the absorption of ultraviolet light resulting in the increased photocurrent,which can improve the responsivity and the detectivity of ultraviolet photodetector.3.In order to further improve the stability of photodetector,using organic polymer poly(2,5-dibutoxybenzene-1,4-diyl)(Bu-PPP)composite with ZnO nanorod arrays to assembled ZnO nanorods/Bu-PPP heterojunction photodetectors.The close contact between organic polymer Bu-PPP and ZnO nanorod arrays can not only enhance the absorption of ultraviolet light,but also effectively collect and transport carriers,which greatly improves the performance of ultraviolet photodetectors. |
