1. Department of Chemistry and Centre for Plastic ElectronicsImperial College LondonSouth Kensington London SW7 2AZ UK
2. Molecular Materials and Nanosystems and Institute for Complex Molecular SystemsEindhoven University of Technology Eindhoven MB 5600 The Netherlands
3. Department of Physics and Centre for Plastic ElectronicsImperial College LondonSouth Kensington London SW7 2AZ UK
4. Department of Engineering ScienceUniversity of Oxford Oxford OX1 3PJ UK
5. AWE, Aldermaston Reading RG7 4PR UK
6. King Abdullah University of Science and Technology (KAUST)KAUST Solar Center (KSC)Division of Physical Sciences and Engineering Thuwal 23955‐6900 Saudi Arabia