Silicon Wafer manufacturing Preparation.pptx

silicon wafer preparation steps

1. 5- 1 Wafer Preparation High quality wafers are made from quartz sand Quartz sand  reduction and purification  pulled into Si ingot  Sliced into Wafers  Shipped to IC Fab in a clean package

2. 5- 2 Illustration of a Production Wafer Die

3. 5- 3 IC Fabrication Wafers and IC masks are shipped to an IC foundry. The IC foundry is a carefully controlled clean room. Wafers are processed in different areas of the clean room. Every process steps has to be well controlled to achieve a high yield

4. 5- 4 Wafer Yield

5. 5- 5 Die Yield

6. 5- 6 Packaging Yield

7. 5- 7 Overall Yield Y T = Y W  Y D  Y C Overall Yield determines whether a fab is making profit or losing money

8. 5- 8 Illustration of a Production Wafer Scribe Lines Dies Test Structures