AUTHOR=Liu Jiangang , Wang Ergang , Zhao Kui TITLE=Editorial: Polymer Solar Cells: Molecular Design and Microstructure Control JOURNAL=Frontiers in Chemistry VOLUME=8 YEAR=2020 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00697 DOI=10.3389/fchem.2020.00697 ISSN=2296-2646