Organic Semiconductor Thin Films and Devices

Organic semiconductors form a class of carbon-based materials whose delocalised π-electron systems enable semiconducting behaviour when organised into thin films. The fabrication of these films by solution processing, vacuum deposition and templated epitaxial growth has unlocked flexible, lightweight and large-area devices including transistors, sensors, displays and photovoltaic cells. Central to performance are the molecular packing motifs, charge-carrier mobility, exciton dynamics and film morphology, all of which hinge on deposition parameters and post-deposition treatments. Recent advances demonstrate that fine-tuning of interfacial layers whilst embracing hybrid automation accelerates device optimisation, and emerging biocompatible and even edible semiconductors point to novel healthcare and environmental applications. Together, these efforts propel organic electronics towards commercial scalability and sustainable manufacturing, fostering applications from wearable diagnostics to next-generation energy harvesting.

Research from Nature Portfolio

Recent studies have provided direct evidence of photogenerated free carriers in crystalline small-molecule semiconductors. Ultrafast spectroscopy experiments revealed that interband excitation in epitaxial zinc phthalocyanine films produces delocalised electron–hole pairs that diffuse over nanometre scales before localising as charge-transfer excitons. This observation challenges traditional excitonic frameworks and underscores the importance of crystalline order in promoting efficient charge generation, with implications for enhanced performance in organic photovoltaics and photodetectors.

Organic Semiconductor Thin Films and Devices publication trend

The graph below shows the total number of articles in organic semiconductor thin films and devices across all publications each year (not limited to Nature Index journals).

Technical terms

Organic semiconductor: A carbon-based material with delocalised π-electron systems capable of conducting charge when organised into solid films.

Thin film: A layer of material, typically ranging from nanometres to micrometres in thickness, used to construct electronic devices.

Field-effect transistor (FET): A device in which an electric field modulates the conductivity of an organic semiconductor channel.

Carrier mobility: A measure of how swiftly charge carriers (electrons or holes) move through a semiconductor under an electric field.

Exciton: A bound state of an electron and a hole generated by optical excitation, relevant in charge-generation processes.

π–π stacking: Non-covalent interactions between aromatic systems that govern molecular packing and charge transport in organic films.

References

1. Photogenerated Intrinsic Free Carriers in Small-molecule Organic Semiconductors Visualized by Ultrafast Spectroscopy. Scientific Reports (2015).
2. High Throughput Characterization of Organic Thin Film Transistors. Advanced Materials (2024).
3. Engineering the Template Layer for Silicon Phthalocyanine‐Based Organic Thin Film Transistors. Advanced Functional Materials (2024).
4. A Fully Edible Transistor Based on a Toothpaste Pigment. Advanced Science (2024).