Polarization Optical Properties Of Low Dimensional ZnO And Its Application In Photoelectric Detection

Because more dimensional information can be get from the polarization phenomenon of light,polarized light detection is of great value in military,medical,environmental science and other fields.Therefore,researchers pay more attention to the regulation and detection of light polarization.At present,the infrared and visible polarization detection technology is relatively mature,but the ultraviolet band polarization detection technology still needs to be improved.One of the problems to be solved in this field is to develop a new type of UV polarization sensitive element with low cost and controllable polarization optical properties and related detection technology.In order to solve the above problems,a series of studies have been carried out in this thesis,focusing on the control of the morphology and the polarization optical properties of ZnO,which is a wide band gap semiconductor,and also contains the UV polarization photoelectric detection technology based on low dimensional ZnO.The main results are as follows:（1）A variety of low dimensional ZnO structures were prepared by hydrothermal method and atomic layer deposition,and their physical properties and polarization luminescence properties were analyzed.The influence of dimension and morphology on polarization optical properties of the samples was clarified.The results show that the ratio of length to diameter of one-dimensional structure can be controlled by hydrothermal method.One dimensional structure of polar surface can be obtained by atomic layer deposition and laser interferometry.Compared with three-dimensional ZnO particles and two-dimensional ZnO films,one-dimensional ZnO structure is the most sensitive to polarized light and has a higher degree of polarization.Comparative analysis shows that the mechanism of the polarization luminescence includes the synergistic effect of morphological anisotropy and structural anisotropy,among which the effect of morphological anisotropy is greater.The above results laid a foundation for the construction of ZnO based UV polarization photoelectric detection.（2）Er³⁺doped ZnO microrods were prepared by hydrothermal method,and their basic physical properties and the polarization optical properties were characterized.The results show that Er³⁺doping leads to the decrease of the intrinsic luminescence in the UV band and the enhancement of the defect luminescence in the visible band.Analysis of polarization shows that the visible luminescence of Er³⁺doped ZnO is also sensitive to the polarization state of incident light.The above results make it possible to use ZnO low dimensional structure to realize ultraviolet polarization detection with visible optical system.（3）Ultra long ZnO microwires were prepared by a two-step method including an atomic layer deposition and a chemical vapor deposition,and the ultraviolet polarization photodetector was constructed.The results show that the length of the sample is visible to the naked eye,and it has excellent polarization luminescence characteristics.The I-V characteristics of the photoelectric detection device based on the ZnO low dimensional structure obviously depend on the polarization state of the incident UV light,which proves the feasibility of using the ZnO low dimensional structure device to realize polarized UV detection.