Achieving 17.38% efficiency of ternary organic solar cells enabled by a large-bandgap donor with noncovalent conformational locking

A strategy was used to tune the absorption spectrum and energy levels. BTBR-2F comprehensively improved the J_sc, V_oc, and FF values of ternary OSCs. The OSC achieved one of the highest PCEs (17.38%) in ternary OSCs with a small molecular donor.