Controlled morphologies by molecular design and nano-embossing

到目前为止，有机太阳能电池的效率还不能与传统的半导体光伏电池竞争。一个主要的挑战是控制供体-受体材料之间的界面区域。在本项目中，合成和设计相自发分离的有机材料以及在导电玻璃衬底上的新型模板沉积方法将实现超分子到纳米尺度的有序。先进的散射实验，如掠射广角和小角x射线散射，将提供所安装纳米结构的完整细节。这种对结构的完全控制和了解将使我们能够系统地研究器件性能对薄膜形态的依赖。利用开尔文力显微镜和导电扫描探针显微镜等高分辨率扫描探针技术来探测活性材料的电学性质。更深入地了解器件物理和潜在的光电过程与界面形态的关系将有助于找到理想的有机太阳能电池结构。

Up to now the efficiencies of organic solar cells cannot compete with conventional semiconductor photovoltaics. One major challenge is the control of the interfacial area between donor-acceptor materials. In this project, the synthesis and design of organic materials that phase separate spontaneously and a novel template deposition method on conducting glass substrates will enable supramolecular to nanometer scale ordering. Advanced scattering experiments such as grazing incidence wide- and small-angle X-ray scattering will give full details about the installed nanostructure. This full control and knowledge about the structure will allow us a systematic investigation of the dependence of device performance on the thin film morphology. The electrical properties of the active materials will be probed with high resolution scanning probe techniques such as Kelvin force microscopy and conductive scanning probe microscopy. Deeper understanding of the device physics and underlying optoelectronic processes in connection to the interface morphology will help to find the ideal organic solar cell structure.