Organic transistors

Illustration of our research into dual-gated polymer devices for independently controlling electronic and ionic charge to study non-equilibrium transport.

Using dual-gated polymer devices, we freeze the counterion distribution while independently tuning the carrier density to study non-equilibrium electron-ion transport. This allows us to probe the Coulomb gap under controlled conditions and reveal how conductivity and thermopower can be enhanced [1].

Graph illustrating our research into improving the operational stability of polymer field-effect transistors by reducing threshold-voltage shifts with molecular additives.

We investigate how water, oxygen and electrical stress create charge traps and degrade organic transistors. By controlling polymer microstructure, molecular additives and encapsulation, we aim to suppress instability and achieve reliable operation while revealing intrinsic transport behaviour [2].

Graph illustrating our research into the stable operation of electrolyte-gated organic transistors in aqueous environments for long-term biosensing.

Using electrolyte-gated organic transistors, we investigate charge transport in aqueous and biologically relevant environments. By improving materials, interfaces and device design, we aim to achieve reliable, long-lived operation for sensing, bioelectronics and healthcare applications [3].

  1. Tjhe, D. H. L. et al. Non-equilibrium transport in polymer mixed ionic–electronic conductors at ultrahigh charge densities. Nat. Mater. 23, 1712–1719 (2024).
  2. Nikolka, M. et al. High operational and environmental stability of high-mobility conjugated polymer field-effect transistors through the use of molecular additives. Nat. Mater. 16, 356–362 (2017).
  3. Simatos, D. et al. Electrolyte-gated organic field-effect transistors with high operational stability and lifetime in practical electrolytes. SmartMat 5, e1291 (2024).