via poisoning

**Via Poisoning** is **an integration defect mechanism where via etch or clean chemistry degrades underlying contact interfaces** - It can increase contact resistance and variability by damaging exposed surfaces before final fill. **What Is Via Poisoning?** - **Definition**: an integration defect mechanism where via etch or clean chemistry degrades underlying contact interfaces. - **Core Mechanism**: Aggressive plasma or wet steps modify surface chemistry, reducing adhesion or conductivity at via bottoms. - **Operational Scope**: It is applied in process-integration development to improve robustness, accountability, and long-term performance outcomes. - **Failure Modes**: Uncontrolled via poisoning can cause high-resistance opens and early reliability fallout. **Why Via Poisoning 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 device targets, integration constraints, and manufacturing-control objectives. - **Calibration**: Tune etch-clean-passivation sequence with Kelvin structures and interface spectroscopy checks. - **Validation**: Track electrical performance, variability, and objective metrics through recurring controlled evaluations. Via Poisoning is **a high-impact method for resilient process-integration execution** - It is a critical reliability concern in scaled interconnect integration.