1. Tezzaron Semiconductor And Then a Miracle Occurs…. 5 years and many dollars later…….. What’s so Funny about Science? By Sidney Harris (1977)

2. Tezzaron Semiconductor A Closer Look at Wafer-Level Stacking Dielectric(SiO2/SiN) Gate Poly STI (Shallow Trench Isolation) Oxide Silicon W (Tungsten contact & via) Al (M1 – M5) Cu (M6, Top Metal) “ Super-Contact ”

3. Tezzaron Semiconductor Super-Orion wafer before Bonding

4. Tezzaron Semiconductor Next, Stack a Second Wafer & Thin:

5. Tezzaron Semiconductor Two wafer Align & BondCourse GrindedFine Grinded After CMPSi Recessed Stacking Process Sequential Picture

6. Tezzaron Semiconductor Grinding Striation at CenterGrinding Striation at MiddleGrinding Striation at Edge Grinding striation vanishes after CMP on pattern wafer Striation caused by grinding disappears after CMP, depth of striation not more than 0.10 µm

7. Tezzaron Semiconductor VERNIER_X-axis Misalignment Stacking Alignment, Infra Red Microscope Images Wafer Left (-80mm,0)Wafer Right (+80mm,0) VERNIER_Y-axis Misalignment Wafer Left (-80mm,0)Wafer Right (+80mm,0) Tezzaron’s Alignment Target Wafer Left (-80mm,0)Wafer Right (+80mm,0) Staked wafer picture

8. Tezzaron Semiconductor Misalign=0.3um Top wafer Bottom wafer High Precision Alignment

9. Tezzaron Semiconductor 3rd wafer 2nd wafer 1st wafer: controller Then, Stack a Third Wafer:

10. Tezzaron Semiconductor 1st wafer: controller 2nd wafer 3rd wafer Finally, Flip, Thin & Pad Out: This is the completed stack!