Interface properties and electronic structure of thiophene-based materials for organic solar cells

低带隙材料仍然是改善有机太阳能电池中活性层的一个问题。基于以前的研究结果和现有技术水平，我们将进一步强调合成和研究新的低带隙施主材料与潜在的应用在“体异质结”型太阳能电池，以实现一个改进的基本理解的有机太阳能电池中的活性有机层（共混物），包括它们的界面的电子特性。噻吩衍生的给体材料将成为研究新分子的焦点。为了系统地研究界面性质，如反应性和电子性质在明确定义的系统，低聚物模型分子的合成。薄膜和界面进行了比较，相应的聚合物和聚合物共混物，系统。研究了有机材料性质、薄膜沉积参数、界面性质（偶极子、势垒、电离势）之间的相关性。选择性修改的界面电极材料的界面上的电子性质，以改善电荷注入的条件的影响进行了研究。调查将使用补充光谱技术，应提供广泛和详细的实验信息，这些物理特性进行。

Low band gap materials remain an issue for the improvement of active layers in organic solar cells. Based on results of the previous investigations and present state of the art we will put further emphasis on synthesis and investigation of new low band gap donor materials with potential for application in “bulk heterojunction”-type solar cells in order to achieve an improved basic understanding of electronic properties of active organic layers (blends) in organic solar cells including their interfaces. Thiophene derived donor materials will be in the focus for the studied new molecules. In order to study interface properties such as reactivity and electronic properties systematically at well defined systems, oligomer model molecules are synthesized. Thin films and interfaces are compared to those of corresponding polymer and polymer blends, systematically. Correlations between organic materials properties, thin film deposition parameters; interface properties (dipoles, barriers, ionization potential) are studied. Selective modifications of interfaces to electrode materials are investigated regarding their influence on the interface electronic properties to improve the conditions for charge injection. The investigations will be carried out using complementary spectroscopic techniques that shall provide wide and detailed experimental information on these physical properties.