Abstract
AbstractTernary strategy is demonstrated as an efficient approach to achieve high short‐circuit current and open‐circuit voltage to boost the performance of organic solar cells (OSCs), however, the realization of high fill‐factor (FF) in ternary OSCs has been rare. In this study, three thiophene terminated non‐fullerene acceptors (NFAs) with methyl or chlorine substitutions on their end‐groups are designed and synthesized, and further incorporated into the state‐of‐the‐art PM6:L8‐BO system to construct ternary OSCs. Subtle changes in their chemical structures significantly modify the molecular packings of these thiophene terminated NFAs. While BTP‐ThMe and BTP‐ThCl have limited forms of dimer, versatile molecular dimers, including “Z” shaped D‐D, “S” shaped A‐A, and “F” shaped A‐D packings exist in BTP‐ThMeCl, which lead to the formation of compact 3D honey‐comb network and this is analogous to the host acceptor L8‐BO. This synergetic molecular packing between BTP‐ThMeCl and L8‐BO contributes to maintain the 3D charge transport network in the ternary system via the formation of NFA co‐crystals at the molecular level, and consequently realizing a maximum power conversion efficiency of 19.1% with a superior FF of 82.2%, which is the highest FF reported so far for OSCs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.