Services / Thin Film Deposition / Custom Film Stacks
Custom Film Stacks
Custom multilayer thin film stack development for electrical, optical, protective, and interface-driven applications. We help design and integrate metal / dielectric architectures based on device function, substrate compatibility, process sequence, and downstream fabrication requirements. Whether the goal is adhesion improvement, diffusion blocking, contact engineering, optical tuning, or environmental protection, multilayer stacks can be built around practical research and prototype-scale needs.
Key capabilities
01
Multilayer stack design
Stack architectures are built around the required device function rather than a single deposition step. This allows each layer to serve a distinct purpose within the full film system.
- Metal / dielectric combinations
- Bilayer, trilayer, and complex multilayer structures
- Functional layer-by-layer design logic
- Stack tuning for conductivity, insulation, or optics
- Integration with research and prototype process flows
02
Interface and barrier engineering
Thin intermediate layers are often critical for improving adhesion, suppressing diffusion, stabilizing interfaces, and increasing long-term device reliability.
- Adhesion layers between substrate and top metal
- Barrier layers for diffusion and contamination control
- Interface tuning between metal, oxide, and nitride films
- Protection against oxidation, delamination, and reaction
- Improved stack integrity for downstream processing
03
Application-driven process integration
Film stacks are evaluated together with lithography, etching, lift-off, annealing, bonding, and packaging requirements to avoid incompatibility later in the process flow.
- Compatible with lift-off or blanket deposition routes
- Designed with etch selectivity and process order in mind
- Thermal budget and substrate sensitivity considered
- Support for electrical, optical, and protective stack goals
- Useful for MEMS, sensors, photonics, and device prototyping
Stack design workflow
How custom film stacks are developed
Define the functional objective
The first step is identifying what the stack must do: carry current, isolate electrically, block diffusion, improve adhesion, control reflectivity, protect a surface, or stabilize an interface. A good multilayer design starts with the end-use requirement rather than only the deposition method.
Select materials by role
Each layer is assigned a purpose within the stack. For example, Ti or Cr may serve as an adhesion layer, Au or Pt as a conductive or noble top layer, and oxides or nitrides as insulating, barrier, or optical control layers. Material selection also depends on substrate type, environment, and downstream processing.
Determine thickness architecture
Layer thickness strongly affects performance. Thin adhesion layers may only need a few nanometers to tens of nanometers, while conductive, barrier, passivation, or optical layers may need much greater thickness. Thickness planning balances function, stress, process time, and patterning strategy.
Match the stack to the process flow
A stack that works in theory may fail in practice if it is incompatible with lift-off, etching chemistry, annealing temperature, wafer handling, or packaging. Multilayer stacks should be evaluated as part of the full device process, including deposition order, patterning route, and post-deposition treatment.
Iterate for performance and manufacturability
Prototype work often requires adjustments to improve adhesion, reduce cracking, tune resistance, stabilize interfaces, or improve repeatability. Small thickness changes or the addition of an interface layer can significantly change final device behavior and process robustness.
Technical considerations
Key parameters for multilayer stack design
| Parameter | Typical consideration | Engineering note |
|---|---|---|
| Stack architecture | Bilayer, trilayer, or custom multilayer sequence | Defined by function of each individual layer |
| Layer role | Adhesion, barrier, conductive, insulating, optical, protective | One stack may combine multiple functions |
| Thickness distribution | Thin interface layers to thicker functional coatings | Thickness strongly affects stress, adhesion, and performance |
| Material compatibility | Metal / oxide / nitride / transparent conductive combinations | Interfacial reaction and diffusion must be considered |
| Substrate type | Si, glass, quartz, sapphire, ceramics, metals, selected polymers | Thermal expansion and surface condition matter |
| Deposition route | PVD, CVD, PECVD, or mixed process sequence | Selected per layer function and material class |
| Patterning route | Lift-off, blanket deposition + etch, or masked deposition | Stack design should anticipate the chosen pattern strategy |
| Thermal budget | Low-temperature to elevated-temperature workflows | Important for polymer, MEMS, and completed device layers |
| Electrical objective | Contact resistance, isolation, leakage control, conductivity | Depends on both material and interface quality |
| Optical objective | Reflectivity, transparency, absorption control, refractive tuning | Layer thickness and index contrast are critical |
| Mechanical stability | Film stress, cracking, bow, delamination risk | Often improved through thickness balancing and interface layers |
| Project scale | R&D, prototype development, engineering iteration | Best suited for custom research and device development programs |
Typical materials and layer roles
Typical applications
Microelectronics
Electrode stacks, adhesion-promoted contacts, barrier layers, and integrated metal / dielectric systems for device and interconnect development.
MEMS
Multilayer films for structural interfaces, bond pads, protective layers, and integrated process flows involving metals and dielectrics.
Photonics & optics
Reflective, transparent, and optical-control stack architectures for photonic devices, windows, waveguide platforms, and sensor optics.
Sensors & packaging
Barrier, passivation, interface, and conductive layers for sensors, hybrid devices, environmental protection, and packaging-related film needs.
Engineering considerations
Why custom stacks matter
A single film often cannot meet all performance requirements at once. For example, a noble metal may provide excellent conductivity and chemical stability but poor adhesion to the substrate, while a dielectric may provide insulation but introduce stress or integration challenges. Custom multilayer stacks solve this by assigning different functions to different layers. In practice, good stack design must consider not only material properties, but also deposition order, interface chemistry, thermal exposure, patterning route, and final device environment. Sharing these details early makes it much easier to build a stack that performs well and integrates cleanly into the full fabrication workflow.
Need a custom multilayer film architecture?
Tell us your substrate, target function, material preferences, and process constraints. We can help define a practical stack design for research, prototyping, and device development.