1. Innovative Centre for Flexible Devices (iFLEX); School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
2. Centre for Materials Science and Nanotechnology; Department of Physics; University of Oslo; P.O. Box 1048 Blindern NO-0316 Oslo Norway
3. Technische Universität München; 85748 Garching Germany
4. TUM CREATE; Singapore 138602 Singapore
5. Institute of Chemical and Engineering Sciences; 1 Pesek Road, Jurong Island Singapore 627833 Singapore
6. Department of Colloid Chemistry; Max Planck Institute of Colloids and Interfaces; 14476 Potsdam Germany