run-to-run control

**Run-to-Run Control** is **a between-lot control strategy that updates recipe setpoints using prior metrology feedback** - It is a core method in modern semiconductor wafer-map analytics and process control workflows. **What Is Run-to-Run Control?** - **Definition**: a between-lot control strategy that updates recipe setpoints using prior metrology feedback. - **Core Mechanism**: Controllers compute correction terms from lot error and process models to keep outputs centered on target. - **Operational Scope**: It is applied in semiconductor manufacturing operations to improve spatial defect diagnosis, equipment matching, and closed-loop process stability. - **Failure Modes**: Poorly tuned models or gains can cause correction oscillation, drift, or over-compensation. **Why Run-to-Run Control Matters** - **Outcome Quality**: Better methods improve decision reliability, efficiency, and measurable impact. - **Risk Management**: Structured controls reduce instability, bias loops, and hidden failure modes. - **Operational Efficiency**: Well-calibrated methods lower rework and accelerate learning cycles. - **Strategic Alignment**: Clear metrics connect technical actions to business and sustainability goals. - **Scalable Deployment**: Robust approaches transfer effectively across domains and operating conditions. **How It Is Used in Practice** - **Method Selection**: Choose approaches by risk profile, implementation complexity, and measurable impact. - **Calibration**: Re-identify model coefficients, monitor controller stability, and govern gain updates through change control. - **Validation**: Track objective metrics, compliance rates, and operational outcomes through recurring controlled reviews. Run-to-Run Control is **a high-impact method for resilient semiconductor operations execution** - It provides practical closed-loop correction without requiring real-time in-chamber control.