Probe Card Technologies in Advanced Semiconductor Testing for Wide Band Gap Devices

The rapid adoption of Wide Band Gap (WBG) and Ultra-Wide Band Gap (UWBG) semiconductor technologies, most notably Silicon Carbide (SiC) and Gallium Nitride (GaN), is reshaping wafer-level electrical testing beyond conventional silicon-based probing infrastructures.[1,2] Modern SiC devices require blocking voltage verification in the 650 V–3.3 kV range, extending beyond 6.5 kV, while GaN HEMTs operate with voltage slew rates exceeding 50–150 V/ns and current slew rates above 1–5 kA/µs. Un-der these conditions, probe cards evolve from passive interconnects into multi-physics systems coupling electrical, thermal, and mechanical domains.[3,4] Vertical MEMS probe card architectures enable high contact density, per-contact currents of 2–10 A (aggregated >1–3 kA), and loop inductance in the single-digit nanohenry range. This work analyzes probe-to-wafer contact physics, including constriction resistance (10–50mΩ) and wear under high current (>10⁵ A/cm²) and high-frequency conditions.[4] Electro-thermal limitations are discussed with focus on insulation integrity, partial discharge, di/dt-induced overshoot, and localized heating (>100–200 °C).[5,6,7] Emerging high-voltage solutions include ceramic insulation, controlled atmospheres, and on-board sensing. Wafer-level testing combines full-wafer screening with burn-in-like stress methodologies, where body diode characterization enables early defect detection in SiC devices. These results highlight the critical role of probe cards in WBG manufacturability and test reliability