Methods and apparatus for thinning, testing and singulating a semiconductor wafer
View Patent ↗A wafer translator is provided with a patterned layer of wafer bonding thermoset plastic and is removably attached with a wafer so as to form a wafer/wafer translator pair. The wafer translator acts as a mechanical support during a thinning process as well as during a wafer dicing operation. The singulated integrated circuits are then removed from the wafer translator. In some embodiments, wafer level testing of the integrated circuits on the wafer is performed subsequent to the wafer thinning process but before the wafer and wafer translator are separated. In other embodiments, wafer level testing of the integrated circuits on the wafer is performed subsequent to the wafer dicing operation but before the diced wafer and wafer translator are separated.
1. A method, comprising:
providing a wafer translator having an inquiry-side and a wafer-side;
disposing the wafer translator on a vacuum chuck such that the inquiry-side is facing the vacuum chuck;
disposing a layer of wafer bonding thermoset plastic on the wafer-side of the wafer translator;
patterning the wafer bonding thermoset plastic such that a plurality of wafer-side contact structures are exposed;
providing a wafer having a topside and a backside, with a plurality of integrated circuits formed thereon;
aligning the topside of the wafer to the wafer-side of the wafer translator;
bringing the wafer and wafer translator into contact, and applying heat and pressure to removably attach the wafer and wafer translator, thereby forming a wafer/wafer translator pair in the attached state;
thinning the wafer from the wafer backside;
performing wafer level testing subsequent to thinning the wafer and prior to dicing the wafer;
dicing the wafer to form one or more individual integrated circuits; and
removing one or more diced integrated circuits.
2. The method of claim 1 , wherein the wafer translator has a silicon core.
3. The method of claim 1 , further comprising performing wafer level testing subsequent to thinning the wafer and subsequent to dicing the wafer.
4. The method of claim 1 , further comprising:
cooling the wafer/wafer translator pair in the attached state prior to thinning the wafer.
5. The method of claim 1 , further comprising:
cooling the wafer/wafer translator pair in the attached state prior to performing wafer level testing on the wafer.
6. The method of claim 1 , further comprising:
cooling the wafer/wafer translator pair in the attached state prior to dicing the wafer.
7. The method of claim 3 , wherein thinning is performed prior to dicing.
8. The method of claim 1 , wherein dicing is performed by wafer sawing.
9. The method of claim 1 , wherein applying heat and pressure does not bring the wafer bonding thermoset plastic to its set temperature.
10. A method, comprising:
providing a wafer translator having an inquiry-side and a wafer-side;
disposing the wafer translator on a vacuum chuck such that the inquiry-side is facing the vacuum chuck;
disposing a layer of wafer bonding thermoset plastic on the wafer-side of the wafer translator;
patterning the wafer bonding thermoset plastic such that a plurality of wafer-side contact structures are exposed;
providing a wafer having a topside and a backside, with a plurality of integrated circuits formed thereon;
aligning the topside of the wafer to the wafer-side of the wafer translator;
bringing the wafer and wafer translator into contact, and applying heat and pressure to removably attach the wafer and wafer translator without bringing the bonding thermoset plastic to its set temperature, thereby forming a wafer/wafer translator pair in the attached state;
thinning the wafer from the wafer backside;
performing wafer level testing subsequent to thinning the wafer and prior to dicing the wafer;
dicing the wafer to form one or more individual integrated circuits; and
removing one or more diced integrated circuits.
11. The method of claim 10 , wherein the wafer translator has a silicon core.
12. The method of claim 10 , further comprising performing wafer level testing subsequent to thinning the wafer and prior to dicing the wafer.
13. The method of claim 10 , further comprising performing wafer level testing subsequent to thinning the wafer and subsequent to dicing the wafer.
14. The method of claim 13 , wherein thinning is performed prior to dicing.
15. The method of claim 10 , further comprising:
cooling the wafer/wafer translator pair in the attached state prior to thinning the wafer.
16. The method of claim 10 , further comprising:
cooling the wafer/wafer translator pair in the attached state prior to performing wafer level testing on the wafer.
17. The method of claim 10 , further comprising:
cooling the wafer/wafer translator pair in the attached state prior to dicing the wafer.
18. The method of claim 10 , wherein dicing is performed by wafer sawing.