Ultra-low defect density achieved through systematic optimisation of etch, deposition, and lithography parameters.
Wafer-level yield improvement through DOE-driven process window optimisation and multi-chamber matching.
Qualification run reduction using statistically designed experiments for efficient tool matching and capability demonstration.
Semiconductor
Design of Experiments
Semiconductor fabrication involves ultra-precise process control where fractions of a percent matter. Our DOE methodology optimises etch processes, deposition uniformity, and lithography exposure — achieving defect rates below 0.1% through systematic multi-variable optimisation.
DOE Challenges
in Semiconductor
Nanoscale precision, ultra-low defect rates, and multi-chamber interactions drive semiconductor DOE needs.
Etch Process Optimisation
Plasma power, gas flow ratios, chamber pressure, and temperature interact at nanoscale precision. DOE determines the critical parameter combinations for uniform etch depth and profile control.
Deposition Uniformity
CVD and PVD processes must achieve wafer-scale thickness uniformity within nanometres. DOE identifies the deposition parameters that minimise across-wafer and wafer-to-wafer variation.
Lithography Exposure Control
Dose, focus, NA, and resist parameters must be optimised for critical dimension control. DOE determines process windows that maintain CD uniformity across the exposure field.
Multi-Chamber Matching
Process tools must deliver identical results across multiple chambers. DOE identifies chamber-specific corrections and verifies matching using statistically designed qualification experiments.
Our 8-Step
DOE Framework
A precision-focused 8-step DOE methodology for semiconductor process development and yield improvement.
Planning
Define clear objectives, success criteria, and measurable KPIs that align the experiment with your broader engineering and business goals.
Identify all relevant factors and their operational levels, establish measurement system reliability through Gauge R&R studies, and define statistical control boundaries. A robust plan ensures resources are allocated efficiently and that every test run produces actionable data.
Screening
Run targeted preliminary experiments to separate the critical few factors from the trivial many, drastically reducing experimental scope.
Leverage Fractional Factorial, Plackett-Burman, or Definitive Screening Designs to evaluate dozens of potential variables in a fraction of the runs a full factorial would require. The deliverable is a ranked Pareto chart of factor significance, enabling your team to focus on the variables that truly drive performance.
Modelling
Construct a rigorous mathematical model that quantifies how significant factors and their interactions drive your response variable.
Apply Full Factorial or Response Surface designs to capture main effects, two-way interactions, and curvature. The resulting model is validated with ANOVA, residual diagnostics, and R-squared metrics to ensure it reliably predicts system behaviour across the design space.
Optimisation
Fine-tune factor settings using response surface methodology to pinpoint the operating conditions that maximise yield, quality, or efficiency.
Deploy Central Composite or Box-Behnken Designs to map the response surface and locate global optima, even in the presence of complex factor interactions. Multi-objective optimisation techniques such as desirability functions are applied when balancing competing performance targets.
Verification
Execute confirmation runs under the predicted optimal conditions to validate that the model accurately reflects real-world process behaviour.
Compare observed responses against model predictions using confidence and prediction intervals to assess agreement. If deviations exceed acceptable thresholds, the model and optimisation parameters are iteratively refined until robust, repeatable performance is confirmed.
Execution
Carry out each experimental run according to the randomised design matrix, maintaining strict control over environmental conditions and procedural consistency.
All relevant process parameters, environmental readings, and response measurements are recorded in structured data logs with full traceability. Randomisation and blocking strategies are enforced to guard against systematic bias, ensuring the collected dataset is statistically sound.
Analysis
Apply statistical analysis — including ANOVA, effect plots, and contour maps — to extract meaningful patterns, interactions, and correlations from the experimental data.
Beyond classical statistics, advanced predictive models are built using neural networks (SANN), machine learning algorithms, and AI-driven pattern recognition. These complementary techniques uncover non-linear relationships that traditional regression may miss, delivering deeper process understanding.
Utilisation
Translate experimental insights into concrete process improvements, updated specifications, and operational best practices that drive measurable business value.
A comprehensive report documenting the experimental design, statistical findings, and recommended operating windows is delivered to all stakeholders. Knowledge is embedded into SOPs, control plans, and continuous improvement frameworks to ensure long-term retention and replication across projects.
What You
Receive
Semiconductor-grade DOE deliverables for process development, qualification, and yield improvement.
Process Window Analysis
Multi-factor process window with acceptable operating ranges for critical dimension, uniformity, and defect density targets.
Defect Source Identification
Screening design results linking process parameters to defect types, locations, and densities with statistical significance.
Uniformity Optimisation
Response surface analysis of across-wafer and wafer-to-wafer uniformity with optimal parameter settings.
Equipment Qualification Protocol
Statistically designed qualification experiments for tool matching and process capability demonstration.
Yield Model
Statistical model relating process parameters to wafer-level yield with prediction intervals and sensitivity analysis.
SPC Implementation Plan
Control chart recommendations, sampling plans, and out-of-control action plans based on DOE-identified critical parameters.
Proven Results in
Semiconductor
Based on DOE projects across front-end and back-end semiconductor processing.
Semiconductor
DOE FAQ
Common questions about Design of Experiments in semiconductor fabrication.
Ready to
Optimise?
Our semiconductor DOE specialists deliver precision process optimisation for ultra-low defect manufacturing.
- Systematic multi-variable optimisation
- Semiconductor-specific DOE methodology
- AI & ML-powered predictive modelling