Organic Field-Effect Transistor Technologies and Materials

Organic field-effect transistors (OFETs) exploit carbon-based semiconductors to deliver low-cost, mechanically flexible and large-area electronics. These devices typically comprise a thin organic semiconductor layer sandwiched between source, drain and gate electrodes, with the conduction channel formed near the interface under an applied gate bias. Progress in conjugated small molecules, polymers and single crystals has driven field-effect mobilities from 10^–4 to over 10 cm² V^–1 s^–1, aided by control of molecular packing and energetic disorder. Key challenges now centre on minimising contact resistance to enable radio-frequency operation, mitigating bias-stress instabilities for operational stability, and ensuring environmental robustness through encapsulation and solvent-compatible processing. Interfacial engineering—via self-assembled monolayers, high-work-function domains and additive-induced crystallinity—has proven critical to achieving steep subthreshold swings, low operating voltages and reproducible threshold voltages. Applications span flexible displays, wearable bioelectronics, printed sensors and active-matrix backplanes, underscoring the global significance of organic transistor technologies for next-generation electronics.

Research from Nature Portfolio

Recent studies have demonstrated orbital hybridisation at the metal–semiconductor interface to achieve total contact resistances as low as 14 Ω·cm in n-channel OFETs, by employing transferred platinum contacts that catalyse side-chain dehydrogenation and narrow the van der Waals gap. Complementary work on inverted coplanar architectures has achieved record-low contact resistances of 29 Ω·cm and subthreshold swings near 62 mV dec^–1, enabling ring oscillator delays below 140 ns per stage at low operating voltages. In parallel, studies of operational degradation have identified trap-state distributions during bias stress and have implemented bespoke encapsulation strategies to limit threshold-voltage shifts to below 0.1 V under high bias in air, thereby securing both polymeric and small-molecule OFETs for practical deployment.

Organic Field-Effect Transistor Technologies and Materials publication trend

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

Technical terms

Organic Field-Effect Transistor (OFET): A transistor in which an organic semiconductor layer controls current between source and drain electrodes under a gate electric field.

Charge-Carrier Mobility: A measure of how quickly electrons or holes move through a semiconductor under an electric field, typically given in cm² V^–1 s^–1.

Contact Resistance: The resistance to charge injection at the interface between the semiconductor and the metallic electrodes, often limiting device speed.

Subthreshold Swing: The voltage required to change the drain current by one order of magnitude in the subthreshold regime, reflecting gate-control efficiency.

Bias Stress: The change in device characteristics (e.g. threshold voltage) under prolonged electrical bias, indicating operational stability.

References

1. Ultralow contact resistance in organic transistors via orbital hybridization. Nature Communications (2023).
2. Small contact resistance and high-frequency operation of flexible low-voltage inverted coplanar organic transistors. Nature Communications (2019).
3. Suppressing bias stress degradation in high performance solution processed organic transistors operating in air. Nature Communications (2021).
4. Improving OFF‐State Bias‐Stress Stability in High‐Mobility Conjugated Polymer Transistors with an Antisolvent Treatment. Advanced Materials (2023).
5. 270 nm ultra-thin self-adhesive conformable and long-term air-stable complimentary organic transistors and amplifiers. npj Flexible Electronics (2023).
6. Low Contact Resistance Organic Single‐Crystal Transistors with Band‐Like Transport Based on 2,6‐Bis‐Phenylethynyl‐Anthracene. Advanced Science (2024).