By Vvon Engineering Team | Published
A procurement guide to permanent versus temporary bonding, alignment, wafer compatibility and acceptance tests, with SUSS SB8 Gen2 as a research-platform example.
A wafer bonder should be selected for a defined stack and process, not wafer diameter alone. A MEMS cavity seal, a temporary carrier for thinning and a hybrid interconnect require different preparation, alignment and inspection. Use a representative stack to establish which equipment and supporting processes belong in the project.
| Requirement | Decision to resolve | Evidence for the enquiry |
|---|---|---|
| Permanent assembly | The bond remains in the finished structure | Substrate materials, bond interface, thermal budget and functional requirements |
| Temporary support | A device wafer is attached to a carrier, then released | Carrier, adhesive or release system, downstream temperatures and allowable residue |
| Aligned integration | Features on the two surfaces must meet a specified tolerance | Alignment marks, optical access and acceptable post-bond overlay |
These are procurement distinctions, not interchangeable machine modes. Temporary bonding needs a complete debonding and cleaning route. A stand-alone bond chamber may require a separate aligner and compatible transfer tooling. Ask who is responsible for each interface before comparing equipment prices.
SUSS describes the SB8 Gen2 as a semi-automated universal bonder for wafers up to 200 mm and other substrate shapes and sizes. Its published process options include fusion, eutectic, diffusion, anodic and adhesive bonding. Suitability for your stack still depends on the fitted tooling and demonstrated recipe; the platform description does not qualify every material combination.
SUSS also publishes separate temporary-bonding equipment, including the DB12T debonder. A permanent bonder and a debonder perform different parts of a workflow. For thin-wafer research, include the release method and wafer handling in the equipment comparison from the beginning.
An aligner specification describes one stage of the process. Heating, contact and transfer can change the final alignment, so a pre-bond number alone cannot establish post-bond performance. Define where and how overlay will be measured on the completed stack, including edge and centre locations when relevant.
Choose acceptance evidence for the device: bond coverage or void inspection, strength, electrical continuity, hermeticity or release quality may be relevant. These tests require different methods and may require additional equipment or an external laboratory. Ask the manufacturer which tests can be included in sample evaluation and which remain the institution's responsibility.
Price cleaning, surface preparation, coating, alignment, bond tooling, inspection and any downstream release alongside the bonder. Confirm cooling, gas, extraction, electrical and floor-space requirements from the installation document. The responsible facility team should assess chemicals, high voltage and heated or pressurised equipment for the chosen process; procurement guidance is not an operating procedure.
For a shared laboratory, record recipe permissions, approved material lists and the method for qualifying a new user or material. Contamination from an exploratory project can affect the next user, so define cleaning responsibilities and changeover evidence before the facility opens.
Send Vvon the stack brief, alignment target, intended acceptance tests and existing equipment list. Ask for a quotation that identifies the bonder, aligner or transfer tooling, training, site responsibilities and current manufacturer support. If the process is still exploratory, request a sample-feasibility discussion before fixing a performance guarantee. View the nano-fabrication range, call +880 1819-101810 or email info@vvon.com.bd.
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