Die-to-Wafer (D2W)
Die-to-Wafer (D2W) is an advanced semiconductor packaging and 3D integration technique in which individual semiconductor dies are bonded onto a target wafer. Unlike traditional wafer-to-wafer (W2W) bonding, where two complete wafers are joined together, D2W allows only selected dies—typically known-good dies (KGD)—to be integrated onto a wafer. This significantly improves manufacturing yield and enables heterogeneous integration.
D2W vs W2W
| Characteristic | Die-to-Wafer (D2W) | Wafer-to-Wafer (W2W) |
|---|---|---|
| Bonding unit | Individual dies | Entire wafers |
| Yield | Higher (KGD selection) | Lower when one wafer contains defects |
| Throughput | Lower | Higher |
| Heterogeneous integration | Excellent | Limited |
| Chiplet support | Ideal | Less flexible |
| Manufacturing complexity | Higher | Lower |
W2W offers superior throughput because complete wafers are bonded in a single operation. However, if either wafer contains defective dies, yield losses can be significant. D2W addresses this issue by allowing only tested, functional dies to be assembled.
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