基于n-ZnO/i-ZnS径向异质结构纳米线阵列的可见盲紫外光探测器研究

项目名称： 基于n-ZnO/i-ZnS径向异质结构纳米线阵列的可见盲紫外光探测器研究

项目编号： No.61204016

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 梁瑶

作者单位： 大连交通大学

项目金额： 26万元

中文摘要： 径向异质结构纳米线阵列具有高载流子收集效率，大的异质结面积，高的晶体质量以及陷光结构等优势，在光探测领域有巨大的应用潜力。本项目拟采用简单、低成本的水热合成方法，在价格低廉的ITO玻璃和镀有ITO的柔性聚合物衬底上制备n-ZnO/i-ZnS径向异质结构纳米线阵列；通过调节反应溶液中III族金属离子的浓度，控制n-ZnO核层的掺杂浓度以及电导率；摸索在n-ZnO纳米线上外延生长高晶体质量厚度可控的i-ZnS层的生长条件。利用径向异质结构纳米线阵列制成柔性可见盲紫外光探测器，测试器件的性能，确立i-ZnS壳层的晶体质量以及厚度、n-ZnO核层的电导率、器件弯曲度等参数与探测器性能之间的关系。研究i-ZnS壳层中光生载流子的输运机制，确认异质结对光生载流子的分离、抽取、复合过程的影响。本项目为实现廉价高性能柔性的可见盲紫外光探测器奠定基础，具有很强的军事和民用价值。

中文关键词： ZnO；ZnO/ZnS；异质结构；纳米线阵列；紫外光探测器

英文摘要： Radial heterostructure nanowire arrays have a huge potential application in photodetection due to their advantages, including a high carrier collection efficiency, a large heterojunction area, an excellent crystal quality and the light trapping. The applicant plans to synthesize n-ZnO/i-ZnS radial heterostructure nanowire arrays on cheap ITO glass substrates and on flexiable ITO coated polymer substrates by the simple and low cost hydrothermal method. The doping concentration and conductivity of the n-ZnO core can be tuned by changing the group III ion concentration in the precursor solution. The optimized growth conditions will be explored to obtain the i-ZnS shell with a high crystal quality and a controllable thickness. The radial heterostructure nanowire arrays grown on the flexible conductive substrates can be used to assemble flexible visible-blind UV photodetectors. The performance of the photodetectors will be measured. Next,we will study the relationships between the performance of the photodetectors and the crystal quality and thickness of the i-ZnS shell, the conductivity of the n-ZnO core, and the curvature of the photodetector, in succession. The transport mechanisms of photogenerated carrieres in the i-ZnS shell will also be explored. We will pay special attention to the influences of the heterojun

英文关键词： ZnO；ZnO/ZnS；heterostructure；nanowire arrays；UV photodetector