Research On Preparation Of Electrospun Zno Nanofibers And Its Photocurrent Property

As an important multifunctional semiconductor material, zinc oxide (ZnO) has a wide band gap (3.37 eV) and a high exciton binding energy (60 MeV). Nano-ZnO has a range of excellent electrical, optical, magnetic and chemical properties for its small size and large specific surface area. The photoelectric properties of ZnO can be adjusted by doping with proper elements, making it has a broad development prospect in fields of electronics, optics, biology and medicine. ZnO and aluminum (Al)-doped ZnO (AZO) nanofibers were prepared by electrospinning, and the influence of Al on the microstructure and photoelectrical properties of ZnO were researched. Based on ZnO and AZO nanofibers, after immersing absorption in the chloroform solution of poly (3-dodecylthiophene) (PAT12), ZnO/PAT12 and AZO/PAT12 composite films were synthesized, then the influence of PAT12 on the photoelectrical properties of ZnO nanofibers were researched.The average diameter of ZnO nanofibers prepared with optimum experimental parameters was 169nm. The increase of Al content brought the decrease of fiber diameter, the reduction of particle size, the blue shift of UV-Vis absorption spectrum, and the enhancement of fluorescence spectrum, then the reason of these phenomenons was researched. Beside, through the UV-Vis absorption spectrum, we got that the band gap of ZnO increased with Al doped. These mean that the physical property can be controlled through regulating the experimental process and Al doping.In the research, ZnO nanofibers prepared by electrospinning had photocurrent response under white light irradiation. As the Al content increased, the conductivity of ZnO nanofibers first increased and then decreased, and the photocurrent response of ZnO nanofibers had the same trend. The 1 at%-doped AZO has the strongest photocurrent and the weakest attenuation. The photocurrent was improved by about 100% compared to ZnO nanofibers, and the ratio of photocurrent and dark current was about 30. The introduction of PAT12 broadened the absorption range in UV-Vis absorption spectrum of ZnO, and the photocurrent response of ZnO nanofibers was enhanced significantly with the presence of PAT12 with an about 80% improvement in photocurrent. The AZO nanofibers and the composite films synthesized in the research have a potential application in the field of photoelectric conversion.