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

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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.