A Wide Bandgap Polymer with Strong π–π Interaction for Efficient Fullerene‐Free Polymer Solar Cells

A wide bandgap polymer donor PBDTS-DTBTO is designed and synthesized, which shows an optical bandgap of 1.76 eV and strong π–π interaction. By using a low-bandgap acceptor ITIC, power conversion efficiency over 9% is achieved in the fullerene-free polymer solar cells (PSC) device. Furthermore, the PSC devices fabricated by PBDTS-DTBTO:ITIC show relatively small sensitivity to variations of the active layer thickness. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.