Thin Film & Roll-to-Roll Sputtering: Processes and Benefits

As demand grows for lighter, smarter, and more functional products, technologies like sputtering are utilized across a variety of industries including electronics, medical, energy, packaging, and industrial manufacturing. Marian uses roll-to-roll sputtering technologies alongside our precision converting capabilities to support applications requiring ultra high-performance films. 

In this article, we’ll explore the thin film sputtering process, the common materials and substrates used, and the industries that rely on these advanced coating capabilities.

What is Sputtering?

Sputtering is one of many types of physical vapor deposition (PVD) processes used to coat extremely thin layers of material to a substrate surface.

Manufacturers use thin film sputtering to produce coatings with specialized electrical, optical, thermal, or barrier properties.

Thin film sputtering is commonly used to produce:

• • Conductive coatings
  • Metallic films
  • Optical coatings
  • EMI shielding layers
  • Battery current collector films
  • Functional packaging materials
  • Sensor components

How Does Sputtering Work?

In the sputtering process, a target material is bombarded with energized particles inside a vacuum chamber. The target material is ejected toward the substrate where it then bonds to the surface. The thickness of the thin film layer is controlled by regulating the power of the energized particles, adjusting gas flow rate/pressure, and the substrate speed moving past the target material.

Target Materials and Common Substrates

It’s important to correctly pair substrates and target materials to achieve the desired thin film performance. Coating adhesion to the substrate and the interaction between different thin film layers can be adversely affected by either target material choice or substrate incompatibility.

Marian specializes in sputtering non-reactive target materials. Non-reactive targets utilize UHP (ultra-high purity) gases such as argon as the energized particle. Non-reactive sputtering is preferred when stable composition, high conductivity, and process simplicity are required.

Common sputtering target materials include:

• • Pure metals
  • Precious metals
  • Metal alloys*
  • Semiconductors*
  • Dielectrics*

*Materials noted with an asterisk (*) often include materials that require reactive sputtering which utilize oxygen, nitrogen or other gas combinations that not only eject the target material but alter the chemistry of the thin film concurrently.

Commonly used substrates are often flexible materials like PET films, PEN films, PI films, flexible polymers, and metal foils. These materials are also some of the same used in Marian’s core converting capabilities.

Marian has direct working relationships with many of the major film suppliers such as Mylar Specialty Films (formerly Dupont Teijin Films), SKC, 3M™, Toray, and many others.

Examples of sputtering targets showing characteristic erosion patterns created as material is removed during the deposition process

Advantages of Sputtering

Thin film sputtering offers several advantages for manufacturers who require precise, reliable high-performance coatings.

Key benefits include:

• Excellent thin film thickness control
• Uniform coating deposition
• Strong adhesion between the coating and substrate
• High-purity metallic and conductive films
• Compatibility with flexible and temperature-sensitive materials
• Scalable manufacturing for industrial production
• Consistent electrical and optical performance
• Repeatability for precision applications

What is Roll-to-Roll Sputtering?

Roll-to-roll (R2R) sputtering is a type of thin film sputtering that uses a continuous vacuum coating process designed for flexible substrates such as films and foils.

The R2R process begins with the substrate loaded into the vacuum chamber and the vacuum chamber pumped down to a pre-determined base level pressure. The material is then unwound from the input roll, passed by the target materials and coated, then rewound onto another roll. Upon completion of the process, the vacuum chamber is vented to atmosphere and the roll unloaded for further processing.

Roll-to-roll sputtering is ideal for large-scale production because it supports continuous manufacturing with excellent down web and cross web coating consistency.

Advantages of Roll-to Roll Sputtering

Roll-to-roll sputtering offers several important manufacturing advantages including:

• • Continuous high-volume production
  • Excellent coating thickness uniformity
  • Consistent cross-web and down-web performance
  • Compatibility with flexible substrates
  • Scalable manufacturing for large-area films
  • High-quality conductive and metallic coatings
  • Precision process control
    

What Applications Use Thin Film & Roll-to-Roll Sputtering?

Thin film and R2R sputtering play a critical role across many advanced manufacturing industries.

Common applications that use sputtering include:

Sputtering Quality Control and Process Consistency

Some applications that use sputtered parts are critical for day-to-day life. With that in mind, maintaining coating consistency is crucial in thin film manufacturing to ensure reliable performance.

As with all manufacturing at Marian, we maintain strict quality controls for sputtered parts. This includes thin film thickness measurement via state-of-the-art XRF (X-Ray Fluorescence) and automated surface resistivity instruments 4-point probe. Down web coating uniformity is also monitored using in-line, non-contact resistance systems.

Our quality systems also include Installation and Operational Qualification (IQ/OQ), process characterization, and test method development and validation. We can provide customers with documentation and technical collaboration to fulfill compliance requirements as necessary.

Partner with Marian for Thin Film and Roll-to-Roll Sputtering

Sputtering plays an important role in today’s advanced manufacturing applications. Choosing the right coating process, substrate, and material configuration can have a major impact on product performance and manufacturing scalability.

At Marian, we provide precision sputtering capabilities along with advanced converting and material expertise to help customers develop reliable multi-layer custom components for demanding applications. Our team works closely with customers to support material selection, process development, quality validation, and scalable production.

Whether you’re in need of conductive coatings, flexible material processing, or precision converting services before or after sputtering, Marian can manufacture the best solution for your application.

Contact our team to discuss your project requirements and learn more about our roll-to-roll sputtering capabilities.