PCB Fabrication via Self-Assembly Membranes

The patent introduces a self-assembled monolayer (SAM) as an intermediary between the substrate and metal catalyst particles. The SAM, formed by immersing the substrate in a silane solution, provides a chemical bridge that enhances metal adhesiveness. The silane molecules self-assemble on the substrate surface, creating a controlled interface that improves metal circuit reliability without requiring roughness enhancement through polishing or etching.

The patent replaces mechanical polishing and chemical etching processes with a self-assembled monolayer formation process. Instead of physically or chemically modifying the substrate surface to increase roughness, the invention uses chemical self-assembly of silane molecules to create a uniform, controllable interface layer. This substitution eliminates complex fabrication steps and makes the process applicable to various substrate types without requiring surface roughness enhancement.

The patent extracts and eliminates the photoresist coating, masking exposure, developing, and etching steps from the conventional PCB fabrication process. By directly forming metal circuits through catalytic chemical vapor deposition on predefined substrate areas, the invention removes the complex photoresist-based patterning sequence while maintaining circuit pattern precision. This extraction of unnecessary steps simplifies the manufacturing process and reduces the need for repeated testing and repairs.

The patent employs parameter changes in the catalytic chemical vapor deposition process to enable high-density packaging. By controlling deposition temperature, pressure, and catalyst distribution, the invention can precisely form fine lines and mini holes with consistent metal adhesiveness. The self-assembled monolayer provides a uniform foundation that allows reliable metal circuit formation at high density, making fine-line fabrication easier and more cost-effective while reducing PCB size.