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Ultrafast charge injection at complex interfaces: Organic-organic, organic-inorganic and organic-graphene.
Morgante A., Cvetko D., Venkataraman L., Cossaro A.
Interface processes strongly affect the performances and efficiency of organic-based devices. The integration of 2D materials like graphene in organic devices (for example as electrodes) is expected, on the other hand, to improve the overall device performances. A deeper understanding and control of processes like charge transfer (CT) at interfaces between organic films, graphene and metals is necessary. Charge injection across molecular junctions can occur at the femtosecond time scale or even shorter. We use X-ray spectroscopies to investigate, at this time scale, charge injection in complex hetero-structures that include organic molecules, graphene and metallic substrates. We determine charge dynamics in both directions (to/from the molecule) at these interfaces and can give clues on the interface parameters that can increase/decrease the charge transfer efficiency.