Optical and optoelectronic characterization of novel diketopyrrolopyrroles for organic electronics and photonics

摘要

Organic molecules are potential materials for cheap organic electronics and photonics. Small molecules have some major benefits when compared to polymeric materials (a perfectly defined chemical structure, purification of a single molecule is easier, the analysis of the relationship between structure and properties is more straightforward, etc.) and this has led to greater interest in these materials. The aim of this study was to synthesize and characterize novel DPP with N,N-substitution for use in organic electronics and photonics. The easy solubility of some prepared materials facilitates the preparation of thin film structures, e.g. by printing technology which is appropriate for their possible future commercial production. The materials were characterized with respect to their molecular structure. Optical and electrical properties of the devices were investigated. These small molecule thin films were prepared by spin-coating and vacuum evaporation. Their optical properties were studied by absorption and fluorescence spectroscopy, the electrical conductivity was studied by steady state current-voltage characterization. Photoluminescence quantum yield (PLQY) and photoluminescence lifetime was measured as well. Subsequently, the different structures of organic solar cells were prepared and their photovoltaic properties were studied.