Fabless Platform for Wafer Process Integration

TOYOKOU CHEMI (Japan), an affiliated company of AST, is positioned as a fabless, proposal-driven platform. It does not operate its own wafer fabrication facilities; instead, it integrates foundry resources across Japan and other parts of Asia to provide process solution design and manufacturing resource matching. The platform engages from the early stages of projects, supporting requirement analysis and process flow planning, and advances execution in coordination with partner fabs.

Leveraging Japan’s strengths in advanced materials and precision processing, together with manufacturing capabilities across Asia, TOYOKOU focuses on H-cut and thinning-bonding process routes. It supports heterogeneous integration of semiconductor and related materials, covering 4-, 6-, 8-, and 12-inch wafer projects. Process flows and foundry resources are selected and coordinated based on specific project requirements.

In terms of services, the platform provides foundry coordination for heterogeneous bonding and full-wafer processing, while also supporting upfront technical evaluation and solution development. Supported material systems include SOI, POI, SiC (single-crystal/polycrystalline structures), TFLN/TFLT, SiCOI, and other customized substrates, with applications in photonics, power devices, MEMS, and advanced packaging.

Process & Technology Coordination
Based on the established capabilities of partner fabs, TOYOKOU coordinates the implementation of process routes including room-temperature (RT) bonding, thermo-compression bonding, temporary bonding, and surface-activated bonding. Specific approaches are defined according to project requirements.

Capacity & Delivery
Relying on partner production lines, the platform supports prototyping and mid-volume manufacturing. The current delivery capability corresponds to approximately 10,000 wafers per year, subject to project requirements and resource allocation.

Team & Quality Systems
The platform focuses on project management and technical coordination. Manufacturing and quality control are executed by partner fabs in accordance with their respective quality management systems, including ISO 9001, IATF 16949, ISO 14001, and ISO 45001.