Method for plugging a hole
A method for at least partially inserting a plug into a hole, said method comprising the steps of a) providing a at least one substrate with at least one hole wherein said at least one hole has a largest dimension of from 1 μm to 300 μm, b) providing a piece of material, wherein said piece of material has a larger dimension than said at least one hole, c) pressing said piece of material against the hole with a tool so that a plug is formed, wherein at least a part of said piece of material is pressed into said hole, d) removing the tool from the piece of material. There is further disclosed a plugged hole manufactured with the method. One advantage of an embodiment is that an industrially available wire bonding technology can be used to seal various cavities. The existing wire bonding technology makes the plugging fast and cheap.
1. A method for at least partially inserting a plug into a hole, said method comprising the steps of:
a) providing at least one substrate with at least one hole wherein said at least one hole has a largest dimension of from 1 μm to 300 μm,
b) providing a piece of material, wherein said piece of material has a larger dimension than said at least one hole,
c) pressing said piece of material against the substrate centred on a point adjacent to the hole, with a first tool,
d) removing the tool from the piece of material, and
e) additionally pressing said piece of material at least partially into the hole with a flat tool operating in a pressure controllable chamber,
wherein said at least one hole is the opening of a cavity, and
wherein said cavity is filled with a fluid before forming said plug.
2. The method according to claim 1 , wherein said first tool is removed from said piece of material with a movement parallel to the surface of the substrate.
3. The method according to claim 1 , wherein said cavity is under vacuum after forming said plug.
4. The method according to claim 1 , wherein the substrate prior to forming said plug is at least partially coated with at least one metal in the region of said at least one hole.
5. The method according to claim 1 , wherein said material is subjected to at least one selected from heat, and ultrasound during pressing said piece of material against the hole.
6. The method according to claim 1 , wherein said material is a metal.
7. The method according to claim 1 , wherein said material is selected from the group consisting of Au, Al, Cu and Ni.
8. The method according to claim 1 , wherein said plug is an electrode.
9. The method according to claim 1 , wherein a piece of material is pressed against said substrate from both sides.