A-D-A-type S,N-Heteropentacenes: Next-Generation Molecular Donor Materials for Efficient Vacuum-Processed Organic Solar Cells

摘要

Conjugated oligomers, often referred to as "small molecules", come more and more into focus as organic semiconductors in organic solar cells (OSC). Not only do the power conversion efficiencies (PCE), up to 9%, reach those of corresponding polymer solar cells, but also high reproducibility is achieved due to the defined molecular structure. Besides common processing from solution, oligomers furthermore allow processing by evaporation, which leads to highly controlled and well-defined layers of high purity. An additional advantage is that vacuum techniques are solvent-free, while especially the frequently used chlorinated solvents are a critical technical issue in solution-processing and printing of organic solar cells.