Segmented contactor
View Patent ↗A method of fabricating a large area, multi-element contactor. A segmented contactor is provided for testing semiconductor devices on a wafer that comprises a plurality of contactor units mounted to a substrate. The contactor units are formed, tested, and assembled to a backing substrate. The contactor units may include leads extending laterally for connection to an external instrument such as a burn-in board. The contactor units include conductive areas such as pads that are placed into contact with conductive terminals on devices under test.
1. A method of testing a plurality of devices on a wafer comprising:
providing a segmented contactor including a plurality of contactor units, wherein each of said plurality of contactor units includes a tile having a first side and a second side, said tile having electrically conductive areas on said first side for contacting corresponding electrically conductive terminals on said devices, said tile further having a plurality of electrically conductive leads extending beyond an edge of said tile;
connecting said plurality of electrically conductive leads to an external testing instrument;
bringing said electrically conductive terminals on said devices on said wafer into contact with corresponding conductive areas on said tiles, wherein said electrically conductive terminals comprise a plurality of elongate, resilient spring contact elements which are formed on said devices;
energizing said contactor units; and
performing a test on said devices on said wafer.
2. A method as in claim 1 further comprising:
testing each tile prior to said providing.
3. An electrical testing assembly, which is a segmented contactor for testing a semiconductor device, said electrical testing assembly comprising:
a substrate;
a plurality of contactor units assembled with said substrate, said plurality of contactor units having been tested electrically prior to being assembled with said substrate to form said segmented contactor;
a plurality of elongate, resilient spring contact elements formed on the semiconductor device, said plurality of elongate, resilient spring contact elements being electrically connected to circuitry in the semiconductor device;
a plurality of electrically conductive areas arranged on each of said contactor units configured to be electrically connected to the plurality of elongate, resilient spring contact elements on the semiconductor device.
4. The assembly of claim 3 further comprising a plurality of electrically conductive leads extending from each of said contactor units, said leads configured for connection to an external instrument.
5. The assembly of claim 3 wherein said leads of each contactor unit are contained in a flexible strip, said strip secured to said corresponding contactor unit and extending laterally from said corresponding contactor unit.
6. The assembly of claim 3 wherein each of said contactor units are removably mounted to said substrate.
7. The assembly of claim 3 wherein said contactor units are mounted to said substrate with an adhesive.
8. The assembly of claim 3 wherein said contactor units are mounted to said substrate with a conductive material.
9. The assembly of claim 8 wherein said conductive material is thermally conductive.
10. The assembly of claim 8 wherein said conductive material is electrically conductive.
11. The assembly of claim 3 wherein said contactor units are coplanar with each other.
12. The assembly of claim 3 wherein said substrate is silicon.
13. The assembly of claim 3 wherein said contactor units are made of silicon.
14. The assembly of claim 3 wherein said contactor units are made of a material including SiO 2 .
15. The assembly of claim 3 wherein said contactor units are made of a flexible material.
16. The assembly of claim 3 wherein said contactor units are made of an organic material.
17. The assembly of claim 3 wherein the materials of said substrate and said contactor units have substantially similar coefficients of thermal expansion.
18. The assembly of claim 3 wherein a selected one of said plurality of contactor units is electrically connected to at least another one of said plurality of contactor units.
19. The assembly of claim 18 wherein said connected contactor units are connected with wire connections.
20. The assembly of claim 18 wherein said connected contactor units are connected with a flexible circuit.
21. The assembly of claim 3 further comprising an alignment mechanism between said contactor units.
22. The assembly of claim 3 wherein said device is an integrated circuit.
23. The assembly of claim 3 further comprising a plurality of devices.
24. The assembly of claim 23 wherein each of said plurality of devices is an integrated circuit.