Photopatterning of organic mixed ionic electronic conductors for monolithic complementary inverter

High-resolution semiconductor patterning is critical for integrated organic complementary logic circuits. We report a photopatterning strategy based on the rational blending of conjugated polymers and photo-crosslinkable small molecules. The systematic optimization of crosslinker ratio reveals a critical window that yields 151% enhancement in charge carrier mobility for the n-type organic mixed ionic electronic conductor (OMIEC). The crosslinked films achieve enhanced charge carrier mobility (μ = 0.212 cm² V^-1 s^-1) by balancing ion penetration and charge carrier transport through the formation of tailored, dense crosslinking networks. The films exhibit exceptional solvent resistance for over 1 h, enabling sequential multilayer circuit integration without interfacial degradation. This optimized system enables the fabrication of a cofacially integrated organic complementary inverter with a peak gain of 221 VV^-1. This work provides mechanistic insight into photo-crosslinkable OMIECs optimization and a practical route to monolithic organic circuits.