Organic Field-Effect Transistor Sensors for Chemical Detection

Organic field-effect transistor (OFET) sensors are emerging as a transformative class of chemical detectors that leverage the unique electronic properties of organic semiconductors. These devices consist of an organic semiconducting layer interfaced with source, drain and gate electrodes, often deposited on flexible substrates. When target analytes—such as gases, volatile organic compounds or biomolecules—interact with the semiconductor or dielectric interface, they induce changes in charge-carrier density or mobility, causing a measurable variation in transistor current. The solution processability and mechanical compliance of organic materials enable low-cost fabrication techniques, including inkjet printing and roll-to-roll coating, facilitating large-area and disposable sensor arrays. Advances in molecular design, interface engineering and device architecture have yielded sensors with sub-parts-per-billion sensitivity, rapid response times and high selectivity under ambient conditions. Integration of OFET sensors with flexible circuitry and signal-processing units paves the way for wearable environmental monitors, electronic noses and in situ biomedical diagnostics, underscoring their global significance for air-quality surveillance and point-of-care health screening in resource-limited settings.

Research from Nature Portfolio

Recent studies have demonstrated the seamless integration of OFET sensors into compact electronic platforms for real-time chemical detection. One investigation showcased an all-solution-processed OFET with an unencapsulated channel, achieving stable, low-voltage operation and reliable ammonia vapour sensing at nanowatt power consumption. A separate effort described a fully integrated electronic nose on a single substrate, utilising an array of OFETs with monolayer-thick active layers to attain detection limits down to tens of parts per billion in humid air, combined with data-driven discrimination of multiple airborne pollutants. Another development presented a printed organic thin-film transistor immunosensor on an ultra-thin film, functionalised for protein biomarker recognition; this flexible device exhibited quantifiable responses to immunological targets with low detection limits, illustrating its potential for wearable diagnostic tools.

Organic Field-Effect Transistor Sensors for Chemical Detection publication trend

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

Technical terms

Organic field-effect transistor (OFET): A transistor employing organic semiconducting materials as the active channel, where an applied gate voltage modulates current between source and drain electrodes.

Charge-carrier mobility: The rate at which charge carriers move through a semiconductor under an electric field, indicative of device sensitivity and speed.

Solution processability: The ability of a material to be deposited from solution using techniques such as printing or coating, enabling scalable fabrication.

Limit of detection: The lowest concentration of an analyte that can be reliably distinguished from the baseline signal in a sensing device.

References

1. Electron‐Deficient Organic Molecules Based on B←N Unit: A N‐Type Room‐Temperature Chemiresistive Sensors with Moisture Resistance. Advanced Science (2024).
2. Unencapsulated Air-stable Organic Field Effect Transistor by All Solution Processes for Low Power Vapor Sensing. Scientific Reports (2016).
3. Fully integrated ultra-sensitive electronic nose based on organic field-effect transistors. Scientific Reports (2021).
4. Flexible organic thin-film transistor immunosensor printed on a one-micron-thick film. Communications Materials (2021).
5. Recent progress in organic field‐effect transistor‐based chem/bio‐sensors. View (2022).