Photogeneration in Organic Solar Cells (Photogen)

尽管基于电子供体和电子受体材料的有机太阳能电池已经达到超过13%的功率转换效率，但这些器件的详细基本工作原理还不清楚。与无机材料相反，有机材料中光吸收时的有效自由载流子产生是由供体-受体界面处的电荷转移事件引发的，导致一定量的能量损失。通过新材料的合理设计进一步提高功率转换效率只能在了解允许最小化这种能量损失的因素的情况下发生，同时保持高的和场无关的自由电荷载流子产生产率。因此，在本项目中，我们将利用并进一步开发实验技术来测量界面电子结构和光生产率以及相关的能量损失。该项目将产生新分子、供体-受体组合和纳米形态的设计规则，以减少内部能量损失，提高工作电压，从而提高有机太阳能电池的效率。

Even though organic solar cells based on electron donor and electron acceptor materials have reached power conversion efficiencies over 13 %, the detailed fundamental working principles of these devices are not understood. In contrast to inorganic materials, efficient free carrier generation upon light absorption in organic materials is initiated by a charge transfer event at a donor-acceptor interface, resulting in a certain amount of energy losses. A further increase in power conversion efficiency through rational design of new materials can only occur with the knowledge of the factors which allow to minimize this energy loss, while maintaining a high and field independent free charge carrier generation yield. In this project, we will therefore utilize and further develop experimental techniques to measure the interfacial electronic structure and photo-generation yield with associated energy loss. This project will result in design rules for new molecules, donor--acceptor combinations and nano-morphologies for less internal energy losses, higher operating voltages and thus more efficient organic solar cells.