Ambipolar Organic Field-Effect Transistor Technologies

Ambipolar organic field-effect transistors (OFETs) are devices that support balanced transport of electrons and holes within a single semiconducting layer. By enabling dual-polarity operation, they simplify circuit architecture and reduce fabrication steps for complementary logic, sensors and flexible electronics. Central to this performance is the design of donor–acceptor materials, interface engineering and innovative electrode or gate structures that fine-tune injection barriers and channel conduction. Recent efforts have explored split-gate and non-planar architectures to electrically control polarity, as well as heterojunction and bulk-heterojunction blends to establish percolation pathways for both charge carriers. The combination of solution processing, vacuum deposition and post-treatment protocols has further enhanced device uniformity, stability and drive currents. Collectively, these advances point towards scalable, low-cost production of reconfigurable logic elements, wearable sensors and low-voltage flexible electronics with environmental resilience.

Research from Nature Portfolio

High-performance non-planar ambipolar transistors have been demonstrated with electrical polarity control, achieving charge-carrier mobilities orders of magnitude higher than split-gate counterparts and enabling reconfigurable complementary logic gates on flexible substrates. Split-gate thin-film devices based on donor–acceptor polymers have been shown to achieve well-balanced n- and p-type conduction by modulating air exposure and annealing conditions, leading to complementary inverters with matched charging and discharging characteristics. More recently, interface engineering through the introduction of fullerene-doped triphenylamine buffer layers has reduced hole injection barriers to near-ohmic levels, facilitating low-voltage operation and offering a route to optimise electrode-semiconductor contacts in ambipolar architectures.

Research from all publishers

Vertically stacked organic–inorganic heterojunction ambipolar transistors have been fabricated on flexible polyimide, combining p-type dioctylbenzothieno[2,3-b]benzothiophene with amorphous indium-gallium-zinc oxide to yield complementary-like inverters that operate in multiple quadrants with minimal hysteresis. Solution-processed bulk heterojunctions of naphthalene diimide derivatives and semiconducting polymers have been tailored by solvent-vapour and thermal annealing to switch dominant conduction from electrons to holes, highlighting the interplay between morphology, phase segregation and charge transport. Ultrathin bulk-like heterojunctions formed by sublimation of n-type small molecules atop p-type polymer networks have delivered balanced ambipolar performance, demonstrating that combined solution and vacuum processing can yield ordered nanostructures supporting efficient dual-carrier pathways.

Ambipolar Organic Field-Effect Transistor Technologies publication trend

The graph below shows the total number of articles in ambipolar organic field-effect transistor technologies across all publications each year (not limited to Nature Index journals).

Technical terms

Ambipolar conduction: Simultaneous transport of electrons and holes in a single semiconductor layer.

Field-effect mobility: Measure of charge-carrier speed within the transistor channel under an applied gate field.

Bulk heterojunction: Interpenetrating network of donor and acceptor materials forming nanoscale pathways for both carriers.

Split-gate transistor: Device architecture with segmented gate electrodes enabling independent control of channel polarity.

Heterojunction: Interface between two semiconductors with differing energy levels that facilitates selective carrier injection.

Complementary logic inverter: Circuit element formed by pairing p-type and n-type transistors to switch output in response to input voltage.

References

1. Reconfigurable Complementary Logic Circuits with Ambipolar Organic Transistors. Scientific Reports (2016).
2. Balancing Hole and Electron Conduction in Ambipolar Split-Gate Thin-Film Transistors. Scientific Reports (2017).
3. Highly efficient hole injection from Au electrode to fullerene-doped triphenylamine derivative layer. Scientific Reports (2022).
4. Complementary-Like Inverter Based on Organic-Inorganic Heterojunction Ambipolar Transistors on Flexible Substrate. IEEE Journal of the Electron Devices Society (2021).
5. Electron-to Hole Transport Change Induced by Solvent Vapor Annealing of Naphthalene Diimide Doped with Poly(3-Hexylthiophene). Frontiers in Chemistry (2021).
6. Ultrathin film heterojunctions by combining solution processing and sublimation for ambipolar organic field-effect transistors. Journal of Materials Chemistry C (2018).