Synthesis and (photo-)electrical properties of cadmium sulphide nanowires

该项目的中心目标是详细研究硫化镉（CdS）纳米线的电学和光学特性，以评估其光电应用潜力。为此，应优化使用定义明确的分子前体的气相生长工艺，以生产长度在10-20µm范围内的高质量单晶CdS线。将进行单根CdS导线上的电气测量，以确定接触金属的影响，以及作为温度的函数的载流子迁移率。此外，线的光致发光特性的优化应通过涉及附接适当的覆盖层的表面改性来实现。为此，它将集中在电化学沉积方法，这是预期产生可控厚度的涂层。具体而言，应研究含有不同类型官能团的电聚合表面层增强发光效率和光稳定性的能力。

The central aim of this project is a detailed study of the electrical and optical properties of cadmium sulphide (CdS) nanowires, in order to assess their potential for optoelectronic applications. Towards this end, a vapour phase growth process using a well-defined molecular precursor shall be optimised to produce high-quality single-crystalline CdS wires with lengths in the range of 10-20µm. Electrical measurements on single CdS wires will be performed in order to determine the influence of the contact metal, as well as the carrier mobility as a function of temperature. Moreover, optimisation of the photoluminescence properties of the wires shall be achieved via surface modifications involving the attachment of appropriate capping layers. For that purpose, it will be focused on an electrochemical deposition approach, which is expected to yield coatings of controllable thickness. Specifically, electropolymerised surface layers containing different types of functional groups shall be investigated with respect to their ability to enhance the luminescence efficiency and photo-stability of the wires.