Emission Microscopy (EMMI) is a failure analysis technique that detects photon emissions from defective areas of an IC — where current flowing through a defect (gate oxide breakdown, latch-up, hot carriers) generates near-infrared light captured by a sensitive InGaAs camera.

What Is Emission Microscopy?

• Principle: Defective junctions or oxide breakdowns emit photons (hot carrier luminescence, avalanche emission).
• Detection: InGaAs cameras sensitive to NIR wavelengths (900-1700 nm) can "see" through silicon from the backside.
• Modes: Static (DC bias) or Dynamic (pulsed to isolate specific clock cycles).
• Equipment: Hamamatsu PHEMOS, Quantifi/FEI.

Why It Matters

• Localization: Pinpoints the exact transistor or gate responsible for excessive leakage or latch-up.
• Backside Analysis: Essential for flip-chip packages where the frontside is inaccessible.
• Non-Destructive: Can be performed without decapsulation (through Si substrate).

Emission Microscopy is night vision for silicon — seeing the glow of defects invisible to normal optics by capturing their faint photon emissions.