Electron Beam Absorbed Current (EBAC) technique offers a quick and effective method to identify open circuits, high resistance and shorts along interconnects without direct probing techniques of lower level layers.
The EBAC technique is performed with the electron beam by passing through the dielectric layers down to the lower level metallization layer in order to absorb the electron beam current. The electron beam accelerating voltage of the FESEM controls the probing depth or penetration level through the dielectric layers. A single probe is placed on the exposed, upper layer metallization to complete the circuit and allow the electrons to flow through the interconnect.
Observation of high resistance and shorts due to Seebeck effect is possible by using dual probes along with the Hitachi patented differential EBAC amplifiers.
| Probe unit | |
|---|---|
| Unit number | 4 |
| Driving method | Piezoelectric |
| Fine stroke range | 5 µm (X,Y) |
| Coarse stroke range | 6 mm (X,Y) |
| Specimen stage / Base stage | |
| Specimen size | 25 mm × 25 mm × 1 mm thick or less |
| Traverse position | Measurement / Specimen exchange position |
| Specimen exchange | Air-locked exchange chamber |
| Prober navigation | Stage traverse to probe position |
| Measurement position memory | |
| Probe coarse adjustment | |
| CCD image display | Image display from lateral direction |
| Electron optics | |
| Electron gun | Cold field emission electron source |
| Accelerating voltage | 0.5 kV to 30 kV |
| Resolution | 15 nm (at 2 kV, WD=15 mm) |
| Image shift | ±150 µm (at 2 kV, WD=15 mm) |
| EBAC amplifier / Image display | |
| Amplifier type | Current amplifier / Differential amplifier |
| Image display | SEM / EBAC (Single / Parallel / Overlay) |
| Image processing | Black and white reversal display, color display, brightness adjustment, slow scan integration, belt scan |
| Main unit | 1,100 (W) × 1,550 (D) × 1,750 (H) mm, 850 kg |
|---|---|
| Display unit | 1,000 (W) × 1,005 (D) × 1,200 (H) mm, 265 kg |
| Room temperature | 15 – 25 °C |
|---|---|
| Humidity | 60% RH or less |
| Power | AC100 V±10% 5 kVA (M5 crimp terminal) |
| Grounding | 100Ω or less |
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