1. Department of Chemistry and Centre for Processable Electronics, Imperial College London, 80 Wood Lane, London W12 0BZ, U.K.
2. Department of Physical Sciences and Engineering, KAUST Solar Centre (KSC) 4700 KAUST, 23955 Thuwal, Saudi Arabia
3. Department of Chemistry and Materials Innovation Factory, University of Liverpool, 51 Oxford Street, Liverpool L7 3NY, U.K.
4. National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan