TiO2 nanotube templated electron donor/acceptor architectures

我们计划利用最近的进展，在制备良好的定义，空间分离的TiO 2纳米管的光活性有机分子的沉积到墙壁上，并进入管的内部和外部空间。这种模板方法将使我们能够在前所未有的环境中研究光致电子转移，并最终导致难以捉摸的叉指型异质结太阳能电池的制造。TiO 2纳米管将在Schmuki的小组中生长，TiO 2纳米管的内壁将装饰有由von Delius制备的定制有机电子供体的单层。在这些简单的架构中，我们将合作研究分子性质，如间隔长度或锚定基团，如何影响光诱导电子转移（光谱和动力学）到半导体衬底的动力学和效率。虽然冯Delius将设计和合成电子受体/锚基团共轭物，Schmuki将采用他的小组最近开发的软木塞协议，选择性地将电子供体存款到内壁和电子受体到外壁的二氧化钛纳米管。“元素映射”的EDS-TEM手段，最近证明的原理实验，将发挥核心作用，提供所需的选择性固定的证据。除了结构表征，我们将研究在何种程度上和与供体/受体对，光诱导电子转移发生在整个二氧化钛墙。在项目的最后阶段，von Delius将利用他在正交动态共价反应方面的丰富经验，设计和合成复杂的双功能分子，用于选择性填充Schmuki的TiO 2纳米管的内部和外部空间。供体/受体域的尺寸将协同微调，以优化激子寿命，从而潜在地为实现叉指型异质结太阳能电池铺平道路。

We plan to make use of recent progress in the preparation of well-defined, spatially separated TiO2 nanotubes for the deposition of photoactive organic molecules onto the walls and into the inner and outer space of the tubes. This template approach will allow us to study photoinduced electron transfer in an unprecedented environment and could ultimately lead to the fabrication of the elusive interdigitated heterojunction solar cell. TiO2 nanotubes will be grown in the group of Schmuki, and the inner wall of TiO2 nanotubes will be decorated with monolayers of tailor-made organic electron donors prepared by von Delius. In these simple architectures, we will collaboratively investigate how molecular properties such as spacer length or anchoring group, affect the kinetics and the efficiency of photoinduced electron transfer (spectroscopy and kinetics) to the semiconductor substrate. While von Delius will design and synthesize electron acceptor/anchor group conjugates, Schmuki will employ a corking protocol recently developed in his group to selectively deposit electron donors onto the inner walls and electron acceptors onto the outer walls of the TiO2 nanotubes. "Elemental mapping" by means of EDS-TEM, as recently demonstrated in proof-of-principle experiments, will play a central role in providing evidence for the desired selective immobilization. In addition to the structural characterization, we will study to which extent and with which donor/acceptor pairs, photoinduced electron transfer occurs across the TiO2 walls. In the final stage of the project, von Delius will make use of his extensive experience with orthogonal dynamic covalent reactions to design and synthesize sophisticated bifunctional molecules for the selective filling of the inner and outer space of Schmuki's TiO2 nanotubes. The size of donor/acceptor domains will be fine-tuned collaboratively, in order to optimize exciton lifetime, thus potentially paving the way towards the realization of an interdigitated heterojunction solar cell.