Illustration showing light exciting electrons in two molecules of the organic semiconductor known as buckminsterfullerene. The newly formed exciton is first distributed over two molecules before it settles on one molecule . Credit: Andreas Windischbacher, offering insights into their quantum properties and potential for improving energy conversion materials.
Understanding the quantum mechanical properties of these excitons in organic semiconductors has long been considered a major challenge – both from a theoretical and an experimental point of view.The new method sheds light on this puzzle.
Dr. Matthijs Jansen, Göttingen University, explains the significance of the findings: “The organic semiconductor that we studied was buckminsterfullerene which consists of a spherical arrangement of 60 carbon atoms. The question was whether an exciton would always be located on a single molecule or whether it could be distributed across several molecules simultaneously. This property can have a major influence on the efficiency of semiconductors in solar cells.
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