Interface plate between integrated circuits

1. An interface plate capable of being mounted between first and second surface-mounted electronic chips, the plate comprising a plurality of first, second, and third through openings, the first openings being filled with a conductive material and being arranged to be in front of pads of the first and second chips during the assembly, the second openings being filled with a second material, the third openings being filled with a third material, wherein the second and third materials are not identical to each other, forming two complementary components of a thermoelectric couple.

2. The plate of claim 1 , wherein the second or the third material is identical to the conductive material.

3. The plate of claim 1 , wherein the second and the third material belong to the group comprising silicon, germanium, copper, tungsten, and aluminum.

4. The plate of claim 1 , comprising at least one set of first thermoelectric couples cooperating with the first chip, the first couples being series-connected.

5. The plate of claim 4 , wherein the serially connected couples are connected between connection terminals for connection to a microbattery or a buffer capacitor.

6. The plate of claim 4 , comprising at least a second set of second thermoelectric couples cooperating with the second chip, where the second couples are series-connected to one another and are not series-connected with the first couples.

7. The plate of claim 1 , made of silicon.

8. The plate of claim 7 , wherein the silicon has a resistivity greater than 500 ohms·cm.

9. The plate of claim 8 , wherein the silicon has a resistivity greater than 1000 ohms·cm.

10. An electronic device comprising:

a first surface-mounted electronic chip,

a second surface-mounted electronic chip,

an interface plate according to claim 1 , on either side of which the first and second chips are mounted.