Strong Proquinoidal Acceptor Enables High-Performance Ambipolar Organic Electrochemical Transistors.

Ambipolar organic electrochemical transistors (OECTs) can simplify manufacturing processes and reduce device footprints, yet their performance still lags behind their p-type and n-type counterparts due to limited molecular design strategies. Here, incorporating strong proquinoidal building blocks effectively addresses this challenge is demonstrated. Using a computational acceptor screening approach, three TBDOPV-based polymers are designed and synthesized: P(bgTBDOPV-T), P(bgTBDOPV-EDOT), and P(bgTBDOPV-MeOT2), all exhibiting ambipolar behavior across various donor moieties.

Observation of anomalously large Nernst effects in conducting polymers.

As a fundamental thermoelectric phenomenon in many solid-state materials, the Nernst effect has yet to be observed in conducting polymers. This knowledge could provide important insight into their elusive mechanism, which are crucial for flexible optoelectronic and thermoelectric applications. However, within the Landau's Fermi-liquid picture, the Nernst coefficient has demonstrated to be proportional to the charge mobility, and thus should be negligible in less ordered polymers with inherent low mobility.

On-site biosignal amplification using a single high-spin conjugated polymer.

On-site or in-sensor biosignal transduction and amplification can offer several benefits such as improved signal quality, reduced redundant data transmission, and enhanced system integration. Ambipolar organic electrochemical transistors (OECTs) are promising for this purpose due to their high transconductance, low operating voltage, biocompatibility, and suitability for miniaturized amplifier design. However, limitations in material performance and stability have hindered their application in biosignal amplification.