Publication date: 17th February 2025
Flexibility is the most prominent feature of organic solar cells (OSCs) from their inorganic photovoltaic counterparts. Flexible OSCs have been considered as one of the most promising directions in the OSC field, and have drawn tremendous attention in recent years with their potential use as flexible power sources in wearable electronics. In this study, the ternary–blend strategy based on D1–A–D1–D2–type conjugated random terpolymers containing hydrogen–bonding sites is employed to simultaneously improve device efficiency and flexibility. Notably, the PM6-ThEG:PM6-ThOH:Y6-BO ternary–blend system exhibited a remarkable PCE of 17.2% in rigid OSCs and 15.9% in flexible OSCs. Furthermore, the relationship between the efficiency and the number of bending cycles for flexible devices were also explored. Among them, the flexible ternary PSCs exhibited excellent cyclic bending durability. Even after 500 bending cycles, the ternary systems maintained 90% of their initial efficiency: much better than the binary devices. This work provides a feasible guiding idea for future wearable applications.
This work was supported by the National Research Foundation (NRF), by the National Research Council of Science and Technology, and by the Korea Research Institute of Chemical Technology (KRICT) of the Republic of Korea.
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