Trace-level oxygen doping in organic semiconductors: mechanistic insights and precise modulations

• • Trace oxygen doping (typically <1% by volume) can pre-empt donor-like traps, improving OFET mobility by up to 2× and stability, as evidenced by recent studies; industrial impact: enables low-cost, high-performance wearable electronics with extended operational lifetimes. • • Prolonged air exposure leads to oxygen adsorption and penetration into the OSC channel, creating traps that degrade device performance; operational threshold: even 10 ppm oxygen can shift threshold voltage by >5 V, necessitating hermetic encapsulation or controlled doping. • • Modulation strategies such as molecular additives and interfacial engineering have achieved optimized device mobility and stability, with reported improvements in on/off ratio by an order of magnitude; industrial impact: reduces manufacturing costs by minimizing stringent oxygen-free processing. • • Oxygen doping effects are concentration-dependent: at trace levels (<100 ppm), performance enhancement occurs, while higher concentrations (>1000 ppm) cause irreversible degradation; precise control is critical for commercial viability, requiring in-situ monitoring and feedback control systems.