基于多壁碳纳米管/ZnO核壳结构的高性能紫外光电探测器及响应机理研究

With the soaring applications of ultraviolet in daily life, space technology, and national defence fields, the UV detection also increasingly attracts attention of various countries. The ZnO nanostructure based UV photodetectors present ultrahigh responsivity, but the slow response speed hurdles their wide application. To solve this bottleneck problem, this project proposes a new UV photodetector with both high responsivity and response speed based on multiwall carbon nanotube (MWNT)/ZnO core/shell heterostructure. The main content of this project includes 1) preparing MWNT/ZnO core/shell heterostructure using atomic layer deposition method to create radial Schottky junction between MWNT core and ZnO shell, 2) optimizing the preparation and post-treatment parameters to tune the radial Schottky junction and optimize the performance of UV photodetector; 3) investigating on mechanism of fast response of radial Schottky junction to UV illumination. This project is aim to unveil the mechanism of fast response of MWNT/ZnO core/shell heterostructure to UV illumination, and provide fundamental for rational design of high performance photodetector with fast response speed and high responsivity.

随着紫外光在日常生活，空间技术，以及国防领域的的应用日益广泛，对紫外光的探测也越来越引起各国的重视。基于ZnO纳米结构的UV探测器展示出极高的响应率，但是较慢的响应速度制约着ZnO基UV探测的进一步应用。针对这一瓶颈问题，本项目提出了一种新型基于多壁碳纳米管MWNT/ZnO核壳结构的UV探测器，同时实现ZnO基UV探测器的高响应率和高响应速度。具体内容包括利用研究原子层沉积的方法在MWNT表面生长出ZnO壳层，形成连续的径向肖脱基结，调解ZnO壳层厚度和优化制备及后处理工艺，实现对径向肖脱基势垒的调控和MWNT/ZnO核壳结构UV探测器性能的优化；研究径向MWNT与ZnO之间肖脱基结对UV快速响应。本项目旨在揭示MWNT/ZnO核壳结构对UV的响应机制，为设计高响应率，高响应速度的光电探测器提供理论指导。

随着紫外光在日常生活，空间技术，以及国防领域的的应用日益广泛，对紫外光的探测也越来越引起各国的重视。基于ZnO纳米结构的UV探测器展示出极高的响应率，但是较慢的响应速度制约着ZnO基UV探测的进一步应用。针对这一瓶颈问题，本项目提出了一种新型基于多壁碳纳米管MWNT/ZnO核壳结构的UV探测器，同时实现ZnO基UV探测器的高响应率和高响应速度。具体内容包括利用研究原子层沉积的方法在MWNT表面生长出ZnO壳层，形成连续的径向肖脱基结，调解ZnO壳层厚度和优化制备及后处理工艺，实现对径向肖脱基势垒的调控和MWNT/ZnO核壳结构UV探测器性能的优化；研究径向MWNT与ZnO之间肖脱基结对UV快速响应。本项目旨在揭示MWNT/ZnO核壳结构对UV的响应机制，为设计高响应率，高响应速度的光电探测器提供理论指导。