Enclosed cavity structures
An example of a cavity structure comprises a cavity substrate comprising a substrate surface, a cavity extending into the cavity substrate, the cavity having a cavity bottom and cavity walls, and a cap disposed on a side of the cavity opposite the cavity bottom. The cavity substrate, the cap, and the one or more cavity walls form a cavity enclosing a volume. A component can be disposed in the cavity and can extend above the substrate surface. The component can be a piezoelectric or a MEMS device. The cap can have a tophat configuration. The cavity structure can be micro-transfer printed from a source wafer to a destination substrate.
1. A method of making a micro-module structure, comprising:
providing a substrate;
etching the substrate to form a cavity in or on the substrate, the cavity having one or more cavity walls, and a substrate post layer;
depositing component material over the substrate;
patterning the component material to form the component;
etching the substrate post layer to form the substrate post, such that the cavity has a cavity floor and the substrate post protrudes from the cavity floor, wherein the component has a component top side and a component bottom side opposite the component top side, the component bottom side is disposed on the substrate post, and the component extends over at least one edge of the substrate post; and
providing one or more component electrodes disposed on the component.
2. The method of claim 1 , comprising etching the substrate to form the one or more cavity walls and the cavity floor.
3. The method of claim 2 , comprising forming the substrate post on the cavity floor.
4. The method of claim 1 , comprising disposing a cap over the cavity.
5. The method of claim 4 , comprising laminating the cap over the cavity.
6. The method of claim 4 , comprising printing the cap to dispose the cap over the cavity.
7. The method of claim 1 , comprising forming the one or more component electrodes on the component.
8. The method of claim 1 , wherein the component comprises a piezo-electric material.
9. The method of claim 1 , wherein the substrate post comprises a resin or adhesive.
10. The method of claim 9 , comprising coating the resin or adhesive on the substrate and patterning the resin or adhesive.
11. The method of claim 9 , comprising curing the resin or adhesive.
12. A method of making a micro-module structure, comprising:
providing a substrate, the substrate comprising (i) a cavity in or on the substrate, the cavity having a cavity floor and one or more cavity walls, and (ii) substrate post protruding from the cavity floor;
disposing a component on the substrate post, the component having a component top side and a component bottom side opposite the component top side, the component bottom side disposed on the substrate post, the component extending over at least one edge of the substrate post;
providing one or more component electrodes disposed on the component; and
providing a module source wafer comprising a patterned sacrificial layer comprising one or more sacrificial portions each adjacent to one or more anchors, wherein the one or more sacrificial portions are differentially etchable from the wafer and the substrate is disposed at least partially on one of the one or more sacrificial portions.
13. The method of claim 12 , comprising etching one of the one or more sacrificial portions and transferring the substrate to a destination substrate.
14. The method of claim 12 , comprising etching one of the one or more sacrificial portions, picking up the module structure with a pick-up transfer device, transferring the module structure to a printing transfer device, and printing the module structure to a cap with the printing transfer device.
15. The method of claim 14 , wherein the pick-up transfer device and the printing transfer device are each a stamp.