Thin Film Barrier Technologies for Organic Electronics

Organic electronic devices such as light-emitting diodes, solar cells and wearable sensors are inherently sensitive to oxygen and moisture, which undermine their efficiency and lifetime. Thin film barrier technologies address this vulnerability by depositing ultra-thin layers—often inorganic oxides, organic–inorganic hybrids or two-dimensional materials—onto flexible substrates. Key performance metrics include water vapour transmission rate (WVTR) and optical transparency. Conventional inorganic films such as silicon nitride or aluminium oxide provide excellent impermeability but tend to crack under mechanical stress. Hybrid architectures, including nanolaminate stacks or molecularly interspersed layers, exploit alternating sublayers to lengthen diffusion paths and enhance flexibility. Low-temperature processes such as atomic layer deposition (ALD), plasma-enhanced chemical vapour deposition (PECVD) and vacuum ultraviolet (VUV)-induced densification have enabled conformal coating of delicate organic layers without damage. Recent advances combine novel precursors, tailored plasma chemistries and multilayer designs to achieve WVTR values below 10–5 g m–2 day–1 while preserving bendability and transparency. These developments pave the way for rollable displays, stretchable photovoltaics and next-generation biointegrated electronics.

Research from Nature Portfolio

Self-limiting nanolaminate films of zirconium dioxide and organic zirconium alkoxide have been fabricated by remote plasma-enhanced ALD at low temperature. By alternating inorganic and organic layers, the path for water molecules is extended, yielding a WVTR near 3 × 10–5 g m–2 day–1 and smooth surface morphology suitable for flexible organic light-emitting diodes. Very-high-frequency PECVD has been employed to deposit silicon nitride at 80 °C using a multi-tile plasma source. A single 430 nm layer achieves a WVTR of 4.4 × 10–4 g m–2 day–1 without degrading underlying OLED electrical characteristics, demonstrating a route to damage-free moisture barriers on sensitive substrates.

Thin Film Barrier Technologies for Organic Electronics publication trend

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

Technical terms

Atomic layer deposition (ALD): A vapour-phase technique that deposits ultra-thin films one atomic layer at a time via sequential surface reactions.

Plasma-enhanced chemical vapour deposition (PECVD): A process using plasma to activate chemical reactions, enabling low-temperature growth of thin films.

Water vapour transmission rate (WVTR): The mass of water vapour passing through a film per unit area per day, a key metric for barrier efficacy.

Nanolaminate: A multilayer architecture comprising alternating inorganic and organic or inorganic sublayers to prolong permeation pathways.

Vacuum ultraviolet (VUV) irradiation: High-energy ultraviolet light used to induce rapid photochemical densification in thin films.

References

1. Polysilazane‐Coated Films Achieving Record‐High Moisture Barrier Performance with Sub‐10 Seconds Densification Using High‐Power VUV Irradiation. Advanced Science (2025).
2. Efforts of implementing ultra‐flexible thin‐film encapsulation for optoelectronic devices based on atomic layer deposition technology. SmartMat (2024).
3. Low-temperature remote plasma enhanced atomic layer deposition of ZrO2/zircone nanolaminate film for efficient encapsulation of flexible organic light-emitting diodes. Scientific Reports (2017).
4. Silicon Nitride Deposition for Flexible Organic Electronic Devices by VHF (162 MHz)-PECVD Using a Multi-Tile Push-Pull Plasma Source. Scientific Reports (2017).
5. Synergistic gas diffusion multilayer architecture based on the nanolaminate and inorganic-organic hybrid organic layer. Journal of Information Display (2018).