The ThinkLaser SigmaClean is an automated semiconductor wafer laser marking system designed for permanent, highly readable and low-debris wafer identification.
Unlike conventional hard-marking equipment that creates deeper marks on the wafer surface, the SigmaClean uses a controlled soft-marking process to produce shallow dot-matrix identification marks. This makes the system suitable for semiconductor manufacturing environments where wafer traceability, cleanroom compatibility and surface cleanliness are important.
The SigmaClean integrates laser marking, optical wafer alignment, cassette loading, robotic wafer handling, recipe management and production data logging into one automated platform.
Depending on the installed configuration, the system can process polished, non-coated silicon wafers from 100 mm to 200 mm.
Debris-Free Wafer Soft Marking
The main application of the ThinkLaser SigmaClean is debris-free semiconductor wafer soft marking.
Soft marking creates a shallow permanent mark on the wafer surface while minimizing the amount of particles generated during laser processing. This is particularly important in cleanroom production environments where contamination control is critical.
The SigmaClean uses SuperSoftMark technology to produce controlled dot-matrix marks with a representative depth of approximately 2.4 μm to 5 μm.
This process can help manufacturers achieve:
Permanent wafer identification
Low particle generation
Consistent dot formation
Controlled marking depth
High mark readability
Reduced contamination risk
Stable production traceability
Compatibility with cleanroom manufacturing
The final marking parameters should be qualified according to the wafer material, surface condition and downstream manufacturing process.
Permanent Wafer Identification
Semiconductor wafers pass through multiple production, inspection, cleaning, processing and logistics stages. A permanent wafer identification code allows each physical wafer to remain connected to its production records.
The SigmaClean can apply identification information such as:
Wafer ID numbers
Lot numbers
Batch numbers
Serial numbers
Manufacturing codes
Process tracking information
Dot-matrix characters
Barcodes
Two-dimensional data matrix codes
Customer-specific marking formats
Because the information is marked directly onto the wafer, it does not depend on labels, ink or other removable identification methods.
Soft Marking Compared with Hard Marking
Soft marking and hard marking are used for different semiconductor manufacturing requirements.
Hard marking normally produces deeper laser dots intended to remain visible after demanding downstream processes. Soft marking creates shallower marks and is selected when contamination control and reduced surface disturbance are higher priorities.
The ThinkLaser SigmaClean is primarily suitable for applications requiring:
Shallow permanent marks
Reduced particle generation
Cleanroom-compatible wafer processing
Polished silicon wafer marking
Controlled wafer-surface modification
High-volume wafer identification
For processes requiring deeper marks, a hard-marking system may be more appropriate. The correct marking method should be selected according to the wafer material and subsequent production process.
SuperSoftMark Technology
The SigmaClean uses a specialized soft-marking process developed to produce permanent wafer identification with minimal debris.
The system combines controlled laser pulses, precision optics and process monitoring to maintain stable dot depth and mark quality.
Benefits of the soft-marking process may include:
Reduced marking debris
Controlled laser interaction with the wafer
Shallow and uniform dot formation
Improved cleanroom compatibility
Repeatable marking results
Consistent character readability
Reduced variation between production lots
Actual mark quality depends on the laser condition, optical configuration, wafer surface, process recipe and maintenance status.
Class 1 Cleanroom-Compatible Design
The ThinkLaser SigmaClean is designed for installation in semiconductor cleanroom environments.
Its enclosed equipment structure, controlled marking area and low-debris process make it suitable for manufacturing facilities that require strict contamination management.
A typical system may include:
Enclosed laser processing area
Stainless steel equipment enclosure
Mark-point exhaust connection
Static-charge control
Internal particle-control features
Automated wafer transfer
Controlled wafer contact points
Cleanroom-compatible mechanical components
The actual cleanroom suitability of an available machine should be evaluated according to its condition, installed options and the customer’s facility standards.
Automated Wafer Handling
The SigmaClean combines laser marking with automated wafer loading, alignment, transfer and unloading.
A representative system configuration may include:
Three cassette-loading ports
Pick-and-place wafer robot
Dual robot end-effector
Optical wafer aligner
Automatic wafer loading
Automatic wafer unloading
Programmable wafer recipes
Integrated equipment control system
Automated wafer handling helps reduce manual contact with wafers and improves the consistency of wafer positioning during repeated marking jobs.
The actual robot, cassette and end-effector configuration should be confirmed before purchasing a used machine.
100 mm to 200 mm Wafer Processing
The ThinkLaser SigmaClean is designed for semiconductor wafers between 100 mm and 200 mm, depending on the installed handling configuration.
Possible supported wafer sizes may include:
100 mm wafers
125 mm wafers
150 mm wafers
200 mm wafers
Not every machine is necessarily equipped for all listed wafer sizes.
The following items should be checked before purchase:
Cassette-port dimensions
Cassette compatibility
Robot end-effector size
Wafer-aligner capability
Wafer thickness range
Wafer edge profile
Wafer flat or notch compatibility
Software recipe availability
Hardware changes may be required when converting a system from one wafer size to another.
Optical Wafer Alignment
Accurate wafer identification requires precise control of the marking position and orientation.
The SigmaClean uses a high-resolution optical aligner to determine the wafer position before laser marking. This allows the machine to place identification marks relative to the wafer flat, notch or other reference feature.
Optical alignment supports control of:
Marking position
Character orientation
Distance from the wafer edge
Placement of multiple mark groups
Repeatability between wafers
Straight-line marking
Arc-shaped marking
Representative marking repeatability may reach approximately ±75 μm in the X and Y directions relative to the primary wafer reference.
Actual positioning performance depends on the wafer condition, aligner calibration, robot condition and installed software.
Straight-Line and Arc Marking
The SigmaClean supports dot-matrix soft marking in both straight-line and arc-shaped layouts.
Straight-line marks may be used when the identification code is arranged in a horizontal or angled format.
Arc marking allows characters to follow the curved circumference of the wafer.
The system can place multiple marking groups at different orientations within a defined band around the wafer edge.
Typical layout options may include:
Straight identification strings
Curved wafer-edge identification
Multiple character groups
Different mark orientations
Customer-specific mark positions
Primary and secondary wafer IDs
The available layout options depend on the installed software and production recipe.
SEMI-Compatible Marking Formats
The ThinkLaser SigmaClean can support semiconductor wafer identification formats associated with SEMI manufacturing standards.
Representative standard marking formats may include:
5 × 9 single-density dot matrix
9 × 17 single-density dot matrix
10 × 18 double-density dot matrix
T1 BC-412 barcode
T7 two-dimensional data matrix
M12 character formation
M13 character formation
User-selectable checksum
Custom marking fonts
The system may support up to 80 characters per marking group, depending on the selected font, layout and available marking field.
The required character format should be confirmed against the installed software version.
Controlled Dot Diameter and Depth
The SigmaClean is designed to maintain controlled dot dimensions for consistent wafer identification.
Representative marking specifications may include:
Dot diameter from approximately 50 μm to 90 μm
Dot-depth range from approximately 2.4 μm to 5 μm
Dot-roundness control
Multiple calibrated optical spot sizes
Programmable laser process settings
Available spot-size configurations may include approximately:
50 μm
60 μm
70 μm
90 μm
The installed optical hardware determines which spot sizes are available on an individual machine.
Consistent Mark Quality
Readable wafer identification depends on the stability of every laser-generated dot.
The SigmaClean combines an ultra-stable laser source, precision focusing optics and closed-loop system monitoring to help control:
Dot diameter
Dot depth
Dot shape
Pulse energy
Character formation
Marking position
Mark contrast
Recipe repeatability
Consistent dot formation can improve both visual readability and automated machine-vision recognition.
Mark quality should be tested using the customer’s actual wafer type before production use.
High-Throughput Automated Production
The SigmaClean is designed for production-level wafer marking rather than manually loaded individual processing.
The integrated cassette ports, dual-end-effector robot, optical aligner and laser system allow wafers to pass through an automated marking sequence.
Representative throughput may reach approximately 240 wafers per hour under a defined condition using:
Single-pulse marking
A 5 × 9 dot-matrix format
A 12-character identification mark
Actual production throughput depends on:
Wafer size
Number of characters
Marking format
Number of mark groups
Wafer alignment time
Marking depth
Robot travel sequence
Cassette configuration
Equipment condition
Host communication requirements
Production capacity should be evaluated using the intended marking recipe.
Closed-Loop Laser Control
The ThinkLaser SigmaClean may include closed-loop monitoring of laser performance.
This function helps the system maintain stable laser output and record process information during wafer marking.
Available monitoring functions may include:
Laser performance tracking
Pulse stability monitoring
Process data collection
Automatic data logging
Equipment alarm recording
Mark-quality monitoring
Statistical process control support
Preventive maintenance analysis
The exact monitoring functions depend on the controller and software configuration of the machine.
Production Recipe Management
The SigmaClean uses programmable job files for different wafer products and marking requirements.
Operators can create and store recipes containing information such as:
Wafer size
Marking content
Character format
Dot-matrix type
Marking position
Marking orientation
Laser parameters
Marking depth
Cassette assignment
Production quantity
Host communication settings
Recipe storage helps manufacturers repeat qualified marking processes across multiple wafer batches.
SECS II/GEM Factory Communication
The ThinkLaser SigmaClean may be equipped with a SECS II/GEM interface for semiconductor factory automation.
This allows the machine to communicate with a compatible factory host or manufacturing execution system.
Possible communication functions may include:
Equipment-status reporting
Job-file transfer
Recipe selection
Remote processing commands
Alarm reporting
Production data collection
Wafer tracking
Host-controlled operation
Equipment event monitoring
The presence of the communication hardware, software and required licenses should be verified before purchasing an available machine.
Laser and Optical System
Representative SigmaClean systems use an acousto-optic Q-switched, diode-pumped Nd:YLF laser.
Typical laser and optical characteristics may include:
Diode-pumped laser source
Q-switched pulse generation
TEM00 beam mode
Approximately 1053 nm wavelength
Flat-field focusing lens
Stable pulse-to-pulse output
Calibrated laser spot sizes
Closed-loop laser control
Programmable soft-marking parameters
The exact laser model and configuration may vary according to the system manufacturing year.
Before purchasing, buyers should verify:
Laser model
Laser serial number
Laser operating hours
Laser output condition
Pulse stability
Optical-lens condition
Beam alignment
Available spot sizes
Cooling-system condition
Controller compatibility
Supported Wafer Materials
The SigmaClean is primarily intended for polished, non-coated, pure silicon wafers.
Representative applications may include:
Polished silicon wafers
Prime silicon wafers
Monitor wafers
Test wafers
Process-development wafers
Selected reclaimed wafers
Compatibility should be tested before processing:
Coated wafers
Patterned wafers
Compound-semiconductor materials
Silicon carbide wafers
Gallium arsenide wafers
Transparent substrates
Specialty semiconductor materials
Marking performance can vary according to material composition, surface finish, coatings, laser absorption and required mark depth.
Typical Applications
The ThinkLaser SigmaClean can be used in semiconductor production environments requiring low-debris permanent wafer identification.
Silicon Wafer Manufacturing
Silicon wafer suppliers can apply identification codes before wafers are delivered to semiconductor fabrication facilities.
The mark can connect each wafer with material specifications, manufacturing history, inspection data and production-lot information.
Semiconductor Fab Traceability
Semiconductor fabs can use permanent wafer IDs to associate physical wafers with:
Production lots
Process recipes
Equipment records
Inspection results
Quality data
Manufacturing history
Cleanroom Wafer Identification
The low-debris soft-marking process is suitable for facilities that require permanent identification while controlling particle generation.
Wafer Lot Management
Lot numbers, serial numbers and production codes can be marked directly onto wafers to improve material tracking.
Research and Process Development
Research laboratories can use the SigmaClean to identify test wafers, process samples and engineering lots.
Automated Wafer Production
Cassette loading and robotic wafer transfer allow the machine to support repeated production marking with limited manual handling.
Main Equipment Features
Automated semiconductor wafer laser marking
Debris-free soft-marking process
Permanent wafer identification
SuperSoftMark technology
Class 1 cleanroom-compatible design
Support for 100 mm to 200 mm wafers
Polished silicon wafer processing
Shallow and controlled marking depth
Dot-matrix character marking
Straight-line marking
Arc-shaped marking
Multiple marking-group placement
SEMI-compatible marking formats
Optical wafer alignment
Three cassette-port configuration
Dual-end-effector wafer robot
Automatic loading and unloading
Closed-loop laser monitoring
Automated process data logging
Recipe and job-file storage
Fault and alarm logging
SECS II/GEM communication capability
High-volume production design
Representative Technical Specifications
The following values are representative. The actual specifications of the available machine should be verified before purchase.
Marking mode: Dot-matrix soft marking
Marking layout: Straight line or arc
Wafer size: 100 mm to 200 mm
Wafer material: Polished, non-coated, pure silicon
Dot diameter: Approximately 50 μm to 90 μm
Dot depth: Approximately 2.4 μm to 5 μm
Maximum characters: Up to 80 characters per group
Marking field: Approximately 50 × 50 mm after alignment
Marking position: Within a 25 mm band around the wafer circumference
Mark repeatability: Approximately ±75 μm in X and Y
Character formation: SEMI M12 and M13
Wafer alignment: High-resolution optical aligner
Wafer transport: Pick-and-place robot with dual end-effector
Cassette ports: Three ports for 100–200 mm wafer cassettes
Laser type: Acousto-optic Q-switched, diode-pumped Nd:YLF
Laser wavelength: Approximately 1053 nm
Spot sizes: Approximately 50, 60, 70 or 90 μm
Factory communication: SECS II/GEM, configuration dependent
Representative throughput: Up to approximately 240 wafers per hour under specified conditions
Representative Utility Requirements
Facility requirements may vary according to the exact machine configuration.
Representative requirements may include:
Electrical supply: 200–240 VAC
Phase: Single phase
Frequency: 50/60 Hz
Process vacuum: Required
Mark-point exhaust: Required
Operating temperature: Controlled indoor environment
Compressed air: Configuration dependent
Network connection: Required for factory communication
Equipment exhaust connection: Configuration dependent
All facility requirements should be confirmed from the machine documentation before installation.
Equipment Configuration to Confirm
ThinkLaser SigmaClean machines may have different hardware and software configurations according to manufacturing year and original application.
Before purchasing, buyers should confirm:
Manufacturing year
Machine serial number
Current operational condition
Supported wafer sizes
Supported wafer thickness
Cassette-port configuration
Cassette compatibility
Robot condition
Dual-end-effector condition
Wafer-aligner condition
Wafer flat and notch compatibility
Laser model
Laser operating hours
Laser output condition
Optical-system condition
Available spot sizes
Available marking depths
Supported marking fonts
Computer configuration
Operating-system version
Control-software version
Recipe availability
SECS II/GEM availability
Factory-interface licenses
Data-logging capability
Exhaust-system condition
Vacuum-system condition
Maintenance history
Included documentation
Included accessories
Included spare parts
Current installation status
Deinstallation scope
Packing and transportation requirements
The model name alone does not confirm the complete configuration of an individual machine.
Equipment Inspection and Supply Services
Available project services may include:
Used semiconductor equipment sourcing
Equipment-condition inspection
Configuration verification
Wafer-size verification
Laser-source inspection
Optical-system inspection
Robot-function evaluation
Wafer-aligner inspection
Cassette-port inspection
Software-version verification
Factory-interface verification
Deinstallation coordination
Export packing
International transportation
Installation coordination
Spare-parts sourcing
Technical consultation
The available service scope depends on the equipment condition, machine location and project requirements.
Why Choose the ThinkLaser SigmaClean?
The ThinkLaser SigmaClean is designed specifically for semiconductor wafer identification in clean manufacturing environments.
Its soft-marking process creates shallow permanent marks while minimizing debris generation. This makes it different from conventional hard-marking systems that are optimized primarily for deeper engraving.
The combination of automated cassette handling, robotic wafer transfer, optical alignment, laser monitoring and factory communication allows the system to support repeatable production-level wafer identification.
It is particularly suitable for manufacturers processing polished silicon wafers that require permanent traceability without unnecessary surface damage or particle contamination.
Frequently Asked Questions
What is the ThinkLaser SigmaClean used for?
The SigmaClean is used to apply permanent, shallow and low-debris identification marks to semiconductor wafers.
Is the SigmaClean a soft-marking or hard-marking system?
The SigmaClean is primarily a soft-marking system. It creates shallow dot-matrix marks designed to minimize marking debris.
Which wafer sizes can the SigmaClean process?
Representative configurations support silicon wafers from 100 mm to 200 mm.
Can the SigmaClean process 300 mm wafers?
The SigmaClean is mainly configured for 100–200 mm wafers. A different system configuration is generally required for dedicated 300 mm wafer processing.
Which wafer materials are supported?
The standard application is polished, non-coated, pure silicon wafers. Other materials should be evaluated through application testing.
What is the representative marking depth?
Representative soft-marking depth is approximately 2.4 μm to 5 μm, depending on the recipe and system configuration.
Does soft marking generate debris?
The system is designed to minimize marking debris. Actual particle performance depends on the wafer material, process parameters and equipment condition.
Does the machine support automatic wafer handling?
Yes. A representative configuration includes three cassette ports, an optical aligner and a pick-and-place robot with a dual end-effector.
Can it produce arc-shaped marks?
Yes. The system supports straight-line and arc-shaped dot-matrix marking layouts.
Does the SigmaClean support factory automation?
Some systems include SECS II/GEM communication for connection to compatible semiconductor factory host systems.
What should be checked before purchasing a used SigmaClean?
Buyers should verify the wafer-size configuration, laser condition, robot, cassette ports, optical aligner, software version, marking capability, factory interface and maintenance history.
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