Organic Semiconductor Thin Film Processing

Organic semiconductor thin film processing encompasses the strategies and techniques used to deposit, structure and optimise layers of conjugated small molecules or polymers on substrates. Central to this field is the control of film morphology, crystallinity and molecular orientation, which dictate charge transport, optical absorption and device stability. Solution-based approaches—such as spin-coating, slot-die coating, inkjet printing and meniscus-guided deposition—offer low-cost, scalable routes for flexible, large-area electronics. Vapour-phase methods, including organic vapour phase deposition, yield high purity and single-crystal films but at greater cost. Process parameters such as solvent choice, concentration, coating speed, temperature and substrate surface energy interact to influence nucleation, phase separation and π–π stacking. Advances in guiding fluid flow and dynamic templating have enabled centimetre-scale alignment of polymer chains, while novel post-deposition treatments refine film order. These developments underpin progress in organic field-effect transistors, solar cells, light-emitting diodes and stretchable electronics that promise lightweight, conformable and cost-effective technologies.

Research from Nature Portfolio

Recent studies have elucidated the fundamental fluid mechanics and polymer physics underlying meniscus-guided deposition, demonstrating how shear-induced flow at the contact line can be tuned to achieve uniform semiconducting polymer films with enhanced charge mobility. Dynamic-template strategies have introduced reconfigurable surfaces that accelerate polymer nucleation and produce highly aligned, crystalline films over large areas, improving anisotropic transport in thin-film transistors. Further work has revealed the mechanisms of nucleation and strain-stabilisation during solution deposition of acene-based semiconductors, showing that supersaturated precursor states and controlled cooling can lock in favourable lattice parameters and suppress cracking, thereby enhancing thermal stability and carrier mobility.

Organic Semiconductor Thin Film Processing publication trend

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

Technical terms

Meniscus-guided coating: A solution deposition method that uses the moving contact line between liquid and substrate to direct film crystallisation and alignment.

π–π stacking: Face-to-face interactions between aromatic rings in organic semiconductors that facilitate charge transport.

Dynamic templating: A strategy employing reconfigurable surfaces to promote controlled nucleation and assembly of polymer chains.

Spherulitic domain: Spherical crystalline regions that grow radially during solution crystallisation of small molecules.

Bulk heterojunction: A blend of donor and acceptor materials in a thin film architecture, commonly used in organic solar cells to optimise charge separation.

Organic field-effect transistor (OFET): A transistor in which an organic semiconductor layer governs current flow between source and drain electrodes under a gate electric field.

References

1. Morphology control strategies for solution-processed organic semiconductor thin films. Energy & Environmental Science (2014).
2. The meniscus-guided deposition of semiconducting polymers. Nature Communications (2018).
3. Dynamic-template-directed multiscale assembly for large-area coating of highly-aligned conjugated polymer thin films. Nature Communications (2017).
4. Nucleation and strain-stabilization during organic semiconductor thin film deposition. Scientific Reports (2016).
5. Optimized Charge Transport in Molecular Semiconductors by Control of Fluid Dynamics and Crystallization in Meniscus‐Guided Coating. Advanced Functional Materials (2021).