1. Department of Physics and Centre for Plastic ElectronicsImperial College London South Kensington London SW7 2AZ UK
2. Department of Materials and Centre for Plastic ElectronicsImperial College London South Kensington London SW7 2AZ UK
3. Division of Physical Sciences and EngineeringKing Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia
4. Department of Chemistry and Centre for Plastic ElectronicsImperial College London South Kensington London SW7 2AZ UK
5. Department of PhysicsNational Technical University of Athens Athens GR‐15780 Greece
6. Core LabsKing Abdullah University of Science and Technology Thuwal 23955‐6900 Saudi Arabia