Development of Low Turn‐On Voltage Wet‐Processed Organic Rectifier Diodes Based on a <scp>P3HT</scp> : <scp>Y6</scp> Bulk‐Heterojunction

ABSTRACT We report the development of low turn‐on voltage organic rectifier diodes based on a bulk‐heterojunction (BHJ) film of regio‐regular P3HT and Y6. Encouraged by the low open‐circuit voltage observed in P3HT:Y6‐based organic solar cells, we fabricated rectifier diodes with the same architecture as P3HT:Y6‐based organic solar cells. The rectifier diodes achieved a turn‐on voltage ( V f ) of 344 mV, a low value compared to those of other solution‐processed organic rectifier diodes. Although initial devices exhibited a low rectifier ratio (RR) of 1.7 × 10 2 , substituting a laminated Au electrode for the PEDOT:PSS layer improved RR to 2.5 × 10 3 . Mechanistic analysis revealed that rectification originates from the p–n junction formed between P3HT and ZnO rather than the BHJ‐P3HT:Y6 interface. Interestingly, Y6 plays a secondary role in enhancing forward current by modifying the molecular orientation of P3HT. AC–DC conversion simulations at 13.56 kHz yielded a 127 mV output from a 400 mV input, establishing potential for radio‐frequency identification applications.