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性质，以评估其在光电子应用方面的潜力。为此，应优化使用定义明确的分子前体的气相生长过程，以生产长度在10-20微米范围内的高质量单晶硫化镉线材。将对单根硫化镉线材进行电测量，以确定接触金属的影响以及载流子迁移率随温度的变化。此外，线材的光致发光性能的优化应通过表面修饰来实现，包括附着适当的盖层。为此，它将重点放在一种电化学沉积方法上，这种方法有望产生厚度可控的涂层。具体地说，应研究含有不同类型官能团的电聚合表面层提高电线的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.