The Tool Desk
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What equipment works alongside lithography?
Lithography transfers a pattern onto a wafer, but other tools create, modify, remove and measure the materials that make up the device. The categories below describe their roles rather than specific machine models. Equipment makers Lam Research, Applied Materials and ASML describe these as parts of the broader wafer-manufacturing process.
| Equipment category | What it does | Why it matters |
|---|---|---|
| Deposition | Adds thin films of dielectric, metal or semiconductor material. | Builds the material layers used to form device structures and connections. |
| Etch | Removes selected material to transfer or shape features. | Creates structures in the films after they have been patterned or otherwise prepared. |
| Photoresist strip and wafer cleaning | Removes resist, residues, particles and contaminants. | Prepares the wafer surface for the next process step. |
| Ion implantation and thermal processing | Implantation introduces ions into selected wafer regions; thermal equipment heats or treats wafers. | Changes material or electrical properties as required by the device process. |
| Chemical mechanical planarization (CMP) | Uses mechanical polishing and chemistry to remove excess material and flatten a surface. | Creates a more level surface for subsequent processing. |
| Metrology and inspection | Measures films and structures and checks for defects or process variation. | Shows whether a process is producing the intended result and can inform adjustments. |
| Process automation | Coordinates or supports production activities and wafer movement. | Helps connect individual operations into a managed manufacturing flow; a standard configuration is not specified in the cited equipment overview. |
How do deposition, etch and cleaning differ?
Deposition adds material
Deposition systems place thin films onto a wafer. Depending on the material and process, the method may be atomic layer deposition (ALD), chemical vapor deposition (CVD), epitaxy, physical vapor deposition (PVD) or electrochemical deposition. Lam Research describes deposited dielectric (insulating) and metal (conducting) layers as materials used to build semiconductor devices. These methods are process families, not interchangeable settings: the choice depends on the film and device structure required.
Etch removes selected material
Etch equipment removes material selectively so features can be formed in a layer. Dry plasma etching is used for circuit-defining steps, while wet chemical processes serve some etching applications as well as cleaning. The process choice depends on the material and the structure being made.
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- Precision Wafer & Chip Handling Tool:Designed for accurate handling of silicon wafers, semiconductor chips, crystals, and other delicate flat components in laboratory and industrial environments.
- Industrial Stainless Steel Construction:Made from high-quality stainless steel with excellent rigidity, durability, and long-term stability for professional precision applications.
- Non-Magnetic & Contamination-Reducing Design:Non-magnetic structure helps ensure stable performance in sensitive electronic and microelectronic environments while reducing operational interference.
- Anti-Slip Grip for Better Control:Textured handle design improves grip stability and control during long-time precision operations, reducing slipping risks and improving handling accuracy.
- Multiple Model Options Available:Available in different VETUS precision models (e.g., 91-3T, 91-4L, 91-4T) to meet various wafer and micro-component handling requirements.
Strip and clean prepare the wafer
After patterning or other processing, strip and clean systems remove photoresist and residues, along with particles and contaminants. Cleaning can be wet or plasma-based, depending on the application. This is more than housekeeping: unwanted material left on a wafer can interfere with a later operation.
Which tools change wafer properties or surface shape?
Implantation and thermal processing modify material
Ion implantation equipment directs ions into selected wafer regions to change their electrical properties. Thermal processing and treatments are also part of semiconductor equipment categories. These operations are used where the device recipe calls for them; they are not a substitute for deposition, patterning or etching.
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CMP removes excess material and flattens layers
Chemical mechanical planarization combines polishing with chemistry to remove excess material and level the wafer surface. A flatter surface can support later processing. Applied Materials describes a system that measures film thickness and adjusts polishing force. The company says the described CMP process, including post-polish cleaning, can take as few as 60 seconds; that is vendor-specific process information, not a general fab cycle-time benchmark.
How do metrology, inspection and automation support production?
Metrology measures process results
Metrology equipment measures wafer films and structures, helping identify process variation. Inspection equipment checks for defects and errors. ASML describes wafer measurement and inspection throughout chip production and says measurements can be used to optimize and stabilize equipment. In lithography, measurement corrections can also be applied within the lithography system.
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- devised for optimal storage and transport of semiconductor wafers and single crystal substrates in cleanroom environments.
- Constructed from durable polypropylene (PP) material, ensuring maximum grip and minimal pressure during handling.
- Includes a spider ring for effective pressure retention, ensuring wafers remain secure and undamaged.
- Features a conical base devise that supports wafers at the edges, preventing direct and potential damage.
- Each pack contains 10 versatile cases in sizes ranging from 2" to 6", perfect for various wafer handling needs.
Automation connects the operations
Process automation is included as an equipment category in the OECD overview, alongside cleaning, CMP, metrology and inspection. The overview does not establish a standard automation configuration, so the term should not be read as a single required machine or a universal system design. Automation supports a fab’s production flow; the specific arrangement depends on the facility and process.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do these tools fit into a wafer process?
A simplified sequence might deposit a film, use lithography to pattern resist, etch or otherwise modify exposed regions, strip the resist, clean the wafer and measure the result. Implantation or thermal treatments may be added where the device process requires them, and CMP may flatten a layer between operations. Inspection and metrology provide feedback as the process continues. This is a conceptual example, not a fixed recipe: the actual order and choice of tools vary by chip design and materials.
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- devised with a protective insert to protect chips from collisions, ensuring safe handling and transport of delicate components.
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ASML says a manufacturing process can be repeated up to 100 times and that modern chips can have up to 100 layers. These are broad upper bounds in ASML’s explainer, whose publication date is not stated; they do not mean every chip has 100 layers or uses 100 repetitions. ASML’s 2021 manufacturing overview also gives a 3D NAND example with up to 175 layers. That is a dated example, not a current industry-wide maximum.
Does every fab need the same equipment?
No. The sources establish equipment categories, not a universal bill of equipment or a complete set of machine models for every fab. A tool mix depends on the materials, geometries and sequence needed for the device process. The number of process steps, choice of wet or dry methods and need for particular treatments or measurements therefore vary.
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This overview focuses on front-end wafer fabrication. Dicing, packaging and final test are related manufacturing stages, but they should not be confused with the wafer-fab process-tool categories above. ASML’s process overview treats dicing and packaging as later activities.
What about sub-fab and facility equipment?
Wafer-processing tools operate within a larger facility, and auxiliary equipment exists in the sub-fab. However, the cited sources do not provide a complete, current inventory of utilities and support systems or compare their specifications across fab types. It would therefore be misleading to present a definitive facility-equipment checklist from this information alone.
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