1. State Key Laboratory of Luminescent Materials and DevicesInstitute of Polymer Optoelectronic Materials and DevicesSchool of Materials Science and EngineeringSouth China University of Technology 381 Wushan Road Guangzhou 510640 P. R. China
2. Innovation Center of Printed PhotovoltaicsSouth China Institute of Collaborative Innovation Dongguan 523808 P. R. China
3. Institute of Materials for Electronics and Energy Technology (i‐MEET)Friedrich‐Alexander‐University Erlangen‐Nuremberg Martensstraße 7 Erlangen 91058 Germany
4. Helmholtz Institut Erlangen Nürnberg (HI‐ErN)Forschungszentrum Jülich Immerwahrstrasse 2 Erlangen D‐91058 Germany
5. National Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou University Zhengzhou 450002 China